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Jeyasurya, Jeswin. "Biomechanical analysis of assisted sit to stand." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/33814.
Full textAbstract:
A significant number of non-institutionalized older adults have difficulty rising from a chair. Although there exist several assistive devices to aid with sit to stand, there is a lack of research that compares and analyzes various modes of assisted sit to stand to characterize their relative effectiveness in terms of biomechanical metrics. In addition, few existing assistive devices have been designed specifically to share between the user and the device the force required to rise, an approach that has the benefit of maintaining both the mobility and muscular strength of the user.
This thesis advances our understanding of different modes of load-sharing sit to stand through empirical quantification. A specially-designed sit-to-stand test bed with load sharing capabilities was fabricated for human-subjects experiments. In addition to an unassisted rise and a static assist using a grab bar, three mechatronic modes of assist, at the seat, waist and arms, were implemented. The test bed employs a closed-loop load-sharing control scheme to require a user to provide a portion of the effort needed for a successful rise motion.
Experiments were performed with 17 healthy older adults using the five aforementioned modes of rise. Force and kinematic sensor measurements obtained during the rise were used as inputs into a biomechanical model of each subject, and each mode of rise was evaluated based on key biomechanical metrics extracted from this model relating to stability, knee effort reduction, and rise trajectory. In addition, a questionnaire was administered to determine subjective response to and preference for each rise type.
Results show that the seat and waist assists provide statistically significant improvements in terms of stability and knee effort reduction, while the arm and bar assists do not provide any biomechanical improvement from the unassisted rise. The assists most preferred by the subject were the seat and bar assists. Because of subject preference and biomechanical improvements, of the modes tested, the seat assist was determined to be the best mode of providing assistance with sit to stand.
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Campos, Padilla Ivette Yadira. "Biomechanical analysis of the sit-to-stand transition." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/biomechanical-analysis-of-the-sittostand-transition(adfc2efc-4163-4f34-adac-8f58c03a3bc4).html.
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The Sit-to-Stand (STS) transition is a voluntary daily activity that consists of rising from a sitting position to a standing position, an activity that is typically performed by a person several times a day. To undertake the activity successfully requires the coordination of the body limbs in order to transfer the body weight between the sitting and standing positions, maintaining the balance, in order to avoid a fall. A biomechanical analysis of the STS transition provides useful information about the motor ability and control strategy of a person and as such, it is commonly employed to assess functional performance, and as an indicator of lower limb strength in the elderly and in people with disabling diseases. The aim of the work described in this thesis was to investigate and analyse the STS transition in two groups of healthy subjects, a cohort (n=10) of younger adult participants (age range 28±2 years) and a cohort (n=10) of older adult participants (age range 56±8 years), in order to identify the differences in the performances within and between the two groups when the STS transition was undertaken at different speeds. The two groups of participants performed STS transition trials at three, different, self-selected speeds (normal, slow and fast) during which data was recorded from a caption systems, consisting of a set of six infrared-cameras and two force plates. The in-vivo data obtained was applied to a link segment biomechanical model enabling the kinematic contribution of the major body segments to the STS activity to be determined for each participant. A principal component analysis (PCA) was undertaken to identify any aggregate and segmental differences in the STS transition performance between speeds. In addition, a kinetic analysis was performed to determine the torque and power contributions of the lower limb joints during the STS transition. The results from the analysis showed that younger and older participants performed the STS transition with a similar pattern, but they used different strategies to ascend according to the speed at which the activity was being performed. The younger participants used the same strategy at slow speed than the older participants used at slow and normal speeds. Likewise, the younger participants used the same strategy at normal and fast speeds as the older participants used at fast speed. From the segmental analysis it was found that the upper-body and pelvis segments presented the larger variability than the other segments. From the joint analysis, the knee and hip joints were identified as the joints that provide the greatest contribution to the STS transition as they generated most of the power and torque required for the activity. The results obtained and the methodology developed could help clinicians with the diagnosis, planning and selection of treatment for patients with a lack of mobility. This type of analysis may also find application in fields such as robotics, ergonomics and sports training.
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DI, MARCO ANNA. "Sit-to-Stand Phases Detection by Inertial Sensors." Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/945784.
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The Sit-to-Stand(STS) is defined as the transition from the sitting to standing
position. It is commonly adopted in clinical practice because musculoskeletal or
neurological degenerative disorders, as well as the natural process of ageing,
deter-mine an increased difficulty in rising up from a seated position.
This study aimed to detect the Sit To Stand phases using data from inertial sensors.
Due to the high variability of this movement, and, consequently the difficulty to define
events by thresholds, we used the machine learning. We collected data from 27
participants (13 females,24.37±3.32 years old). They wore 10 Inertial Sensors placed
on: trunk,back(L4-L5),left and right thigh, tibia, and ankles. The par-ticipants were
asked to stand from an height adjustable chair for 10 times. The STS exercises were
recorded separately. The starting and ending points of each phase were identified by
key events. The pre-processing included phases splitting in epochs. The features
extracted were: mean, standard deviation, RMS, Max and min, COV and first
derivative. The features were on the epochs for each sensor.
To identify the most fitting classifier, two classifier algorithms,K-nearest Neighbours(
KNN) and Support Vector Machine (SVM) were trained. From the data
recorded, four dataset were created varying the epochs duration, the number
of sensors. The validation model used to train the classifier. As validation
model, we compared the results of classifiers trained using Kfold and Leave
One Subject out (LOSO) models. The classifier performances were evaluated
by confusion matrices and the F1 scores.
The classifiers trained using LOSO technique as validation model showed
higher values of predictive accuracy than the ones trained using Kfold. The
predictive accuracy of KNN and SVM were reported below:
• KFold
– mean of overall predictive accuracy KNN: 0.75; F1 score: REST 0.86,
TRUNK LEANING 0.35,STANDING 0.60,BALANCE 0.54, SITTING 0.55
– mean of overall predictive accuracy SVM: 0.75; F1 score: REST 0.89,
TRUNK LEANING 0.48,STANDING 0.48,BALANCE 0.59, SITTING 0.62
• LOSO
– mean of overall predictive accuracy KNN: 0.93; F1 score: REST 0.96,
TRUNK LEANING 0.79,STANDING 0.89,BALANCE 0.95, SITTING 0.88
– mean of overall predictive accuracy SVM: 0.95; F1 score phases:
REST 0.98, TRUNK LEANING 0.86,STANDING 0.91,BALANCE 0.98,
SIT-TING 0.92
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Frost, Jeremy. "Effects of Sit-Stand Desks in a College Class." Diss., North Dakota State University, 2016. http://hdl.handle.net/10365/25866.
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This disquisition examined the effects of sit-stand desks in a college classroom over the course of a semester and was split into two studies. Paper 1 determined the pattern of sit-stand desk usage over the course of a semester, the relationship to movement outside of class, and likeability of the sit-stand desks. Paper 2 determined the effect of using adjustable-height (sit-stand) desks in a college class on attention (AT), stress (ST), musculoskeletal discomfort (MD), anxiety (AN), and academic performance. Participants (total n=18; control=6) were recruited from two sections of the same course at a public university in Minnesota. Individual daily standing time for the intervention group ranged from 0-100% of daily attendance time and the daily group average ranged from 2.1-38.4%. Weekly standing was lower (p<.05) in week 8 than week 5, 9, 11, 13, and 15. There was no difference in standing percentage between Wednesdays and Fridays. A third of all standing bouts were less than 0.3 min and two-thirds were less than 2 min in length. Perception Questionnaire answers were positive for using the desk and their effect on ability to work in class. The amount of daily moderate-to-vigorous physical activity (MVPA) did not differ between groups or between time points (week 7 vs. 14). All participants completed visual analogue scales (VAS) to measure AT, ST, MD, and AN from week 3-15, and took exams at week 4, 6, 8, 10, 12, 14, and 15. The main findings indicated lower MD scores for the intervention group, higher week 6 than week 11 scores for AN and ST, and more variability in AT and ST scores. Exam scores were not different between groups. There was no difference in direct observation of attention (OAT) between groups (total n=15; control=6) at week 9, 12, or 13. The results indicate the sit-stand desks were utilized at low levels, and for short durations, for most participants, but perceptions of desk use remained positive. In addition, sit-stand desks were associated with lower MD scores and weekly fluctuations in AT, ST, and AN. Future interventions should attempt to minimize the variability in desk use.SCSU Faculty Research Grant
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Kerr, Kathleen Margaret. "An investigation into the sit-stand-sit activity in normal subjects with total hip replacement." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282227.
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Mitchell, Ross Harvey. "Understanding sit-to-stand through experimentation and constraint-based modelling." Thesis, University of Bath, 2004. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404711.
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Grazia, Giulia. "Efficacia della sit-stand workstation nella prevenzione e riduzione del low back pain: revisione sistematica della letteratura." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Find full textAbstract:
INTRODUZIONE
Numerosi soggetti conducono un lavoro sedentario e tra questi la prevalenza annuale della lombalgia è in aumento. La sit-stand workstation è una soluzione proposta per ridurre il tempo di seduta in ufficio, evitando il mantenimento di posture prolungate potenzialmente si possono evidenziare effetti su dolore e discomfort lombare.
SCOPO
L’obiettivo della tesi è ricercare la presenza di studi in letteratura che indaghino l’efficacia della sit-stand workstation in impiegati che soffrono di lombalgia cronica o sono a rischio di svilupparla. Sono stati quindi analizzati gli ambiti di trattamento e prevenzione.
METODI
La ricerca è stata svolta sulle principali banche dati biomediche considerando studi controllati randomizzati e cross-over. Sono stati inclusi i trial che proponevano ad impiegati con low back pain o a rischio di svilupparlo, la postazione di lavoro sit-stand, confrontata con quella standard e che consideravano come outcome il dolore o discomfort lombare.
RISULTATI
Sono stati selezionati 2 studi riguardanti il trattamento e 4 la prevenzione, valutati tramite la scala PEDro. I risultati ottenuti dai singoli studi sono stati analizzati e confrontati. In entrambi gli studi riguardanti il trattamento è stata rilevata una riduzione del dolore lombare e della disabilità causata da lombalgia. Gli studi riguardanti la prevenzione erano molto eterogenei tra loro. A breve termine è stata rilevata una riduzione del discomfort lombare, a lungo termine una riduzione statisticamente significativa per i dolori lombari che hanno impedito lo svolgimento delle attività quotidiane. In nessuno studio è stato evidenziato un aumento del discomfort o eventi avversi.
CONCLUSIONI
Sono necessari ulteriori trial con campione più ampio, che rilevino le migliori posture, gli effetti a lungo termine ed i protocolli più vantaggiosi di mantenimento della posizione seduta e della stazione eretta, sia per gli impiegati a rischio di sviluppare lombalgia sia per chi già ne soffre.
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Janssen, Wilhelmus Gerardus Maria. "The sit-to-stand movement recovery after stroke and objective assessment /." [S.l.] : Rotterdam : [The Author] ; Erasmus University [Host], 2008. http://hdl.handle.net/1765/13555.
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Hughes, Lorraine Cathleen. "A biomechanical analysis of a sit-to-stand transfer among the elderly." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0019/MQ49373.pdf.
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Hoglund, Lisa T. "The Biomechanics of Sit-to-Stand and Physical Performance in Patellofemoral Osteoarthritis." Diss., Temple University Libraries, 2009. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/28196.
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Physical TherapyPh.D.
Osteoarthritis (OA) of the knee is common in Western society. OA of the patellofemoral (PF) compartment of the knee is prevalent in adults greater than 55 years of age. Isolated radiographic PFOA is present in 13.6-24% of females and 11-15.4% of males with knee pain. Biomechanical factors such as tibiofemoral alignment and high joint stress are associated with the development and progression of PFOA. PF joint stress is high when the quadriceps contracts with the knee in a position of extreme flexion, such as rising from sitting. The purposes of this study were to determine 1) the triplanar biomechanics of the hips and knees during sit-to-stand (STS) for persons with PFOA versus age- and gender-matched control subjects, 2) the impact of PFOA on physical performance, perceived functional status, and pain, and 3) the relationship between knee kinematics during STS and physical performance. The biomechanics of STS was examined using a video-based motion analysis system and two force plates. Physical performance was measured with the Timed Up and Go (TUG) and Fifty-Foot Walk (FFW) tests. Perceived functional status, pain, and stiffness were measured using the Western Ontario and McMaster University Osteoarthritis Index (WOMAC) questionnaire. Knee pain was measured with a Visual Analog Scale (VAS) following STS, TUG, and FFW. Persons with PFOA required a significantly longer time to perform STS and the TUG as compared to healthy controls. The PFOA group demonstrated greater hip flexion and knee abduction versus the control group. The hip and knee moments were significantly different with the PFOA group demonstrating greater hip extension, hip abduction, hip external rotation, knee extension, and knee adduction moments. Persons with PFOA were found to have significantly less perceived physical function, greater stiffness, and greater pain. Pain following STS, TUG, and FFW were all greater in the PFOA group. No significant association was found between any knee angle and time to perform the TUG or the FFW. These results indicate that dynamic malalignment of the TF joint is present during STS in persons with PFOA. This may contribute to the increased pain and decreased function in persons with PFOA.
Temple University--Theses
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Dolecka, Urszula E. "Spaced Retrieval, Errorless Learning and Vanishing Cues in Retraining Sit-to-Stand in People Living with Dementia." Thesis, Griffith University, 2016. http://hdl.handle.net/10072/366094.
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Inability to stand up independently has significant consequences for older adults and people living with dementia and can lead to dependency and institutionalisation. Physiotherapists frequently retrain sit-to-stand (STS) during rehabilitation, addressing underlying impairments, and teaching STS strategies with the aim of making the task easier (Carr & Shepherd, 2010, pp. 77-92). These strategies comprise sliding forward, moving the feet backwards, leaning forward and pushing through the armrests (Janssen, et al., 2002). However, there is limited empirical evidence regarding which STS strategies are actually used by older adults and people living with dementia when standing up unconstrained from a standard chair with or without a table in front. During therapy sessions physiotherapists use verbal instructions and feedback that are often ambiguous and extensive (Parry, 2005b; Talvitie & Reunanen, 2002). Providing extensive verbal instructions appears to be counterproductive when working with people living with dementia as they respond better to short, action based commands (Christenson, et al., 2011). People living with dementia have memory problems that have a detrimental effect on learning. However, as the decline in declarative memory occurs, implicit memory is preserved much longer and can be used in task retraining (Grandmaison & Simard, 2003; Hopper, 2003). Practicing over increasing time intervals (spaced retrieval) (Camp, et al., 1996), without errors (errorless learning) (Clare & Jones, 2008), using cues in a structured manner (vanishing cues) (Haslam, et al., 2010), and written instructions (Bouergeois, et al., 2003; Curtin, 2011) have been demonstrated as beneficial for learning in people living with dementia but have not been broadly used in physiotherapy (Creighton, et al., 2013; White, et al., 2014).Thesis (Masters)
Master of Philosophy (MPhil)
School of Allied Health
Griffith Health
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Elibol, Ercan. "Analysis and Energy Reduction of Humanoid Robot Motions – Stand Up and Sit Down." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5682.
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This research studies the electrical power reduction and control analysis of various motion tasks of a humanoid robot. These motions include standing up and sitting down. Each motion’s tasks have their stable and unstable phases throughout the complete motion cycle. Unstable phases can be caused by gravity forces and improper handling of the upper body of the humanoid robot leaning too forward or backward. Even though most of the dynamic motions seem to be accomplished very simply by humans; standing up and sitting down could create challenges for humanoid robots. Some of the critical challenges researches face are: dynamic nature of motions, humanoid robot joint coordination, whole body balance, stability of the model, limited energy source, energy saving techniques and modeling. Dynamic motions of humanoid robots can be modeled and analyzed to reduce electrical power use. In order to accomplish such energy savings, a researcher needs to study the kinematics, dynamics of a humanoid, and motion tasks with given constraints. The robot in this research is modeled as a planar humanoid robot. All motion tasks of a humanoid robot are characterized in terms of motion variables. These motion variables include joint angular positions, joint angular velocity, joint angular acceleration, humanoid robot center of mass (CoM) position, velocity and acceleration change and center of pressure (CoP) position change. All mathematical models are completed so that electrical power analysis of each task produce comparable results. Humanoid robot joint cost functions related to energy consumption are used to define joint input electrical power used, joint mechanical power used, joint mechanical power dispersion and joint power loss due to torque required.
In this research, a 4-link 3-joint humanoid is modeled for standing up and sitting down tasks. For each task, kinematics and dynamics models are created, motion constraints are found, energy and power usage analysis for whole robot and for individual joint motors are accomplished. By finding the best energy usage per motion variable, humanoid robot used less input electrical power to accomplish the motion task.
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Srisupornkornkool, Kanokwan. "Effect of aging on the planning and execution of sit-to-stand movement." Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/62781/.
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Whole-body coordination such as in sit-to-stand (STS) movements is an important activity of independent daily living that is affected by decreased muscular strength and postural control due to ageing and also as a result of neurological diseases such as stroke. Recent research has taken an interest in using motor imagery for rehabilitation and training because it has many features in common with movement execution without some of the practical difficulties of repeated physical practice. Imagery tends to be more effective when it takes a first person perspective and focuses on kinesthetic aspects of movement. On the contrary, research in exercise science shows that movement execution is more fluent when attention is focused on body-external perceptual consequences of movement. How ageing affects this difference in the impact of attentional focus is not well understood. This thesis examines the effects of body-external (visual) and body-internal (muscular or somatosensory) attentional focus on STS movement execution and imagery in healthy young and older adults. The thesis reports four experiments comparing execution and imagery performance in young and older adults. Experiment 1 was designed to clarify the impact of attentional focus on motor performance and imagery in young and older adults. Experiment 2 examined the impact of changing the level of effort (by manipulating the starting seat height) on the effects of attentional focus. Experiment 3 measured the impact of unimanually balancing a load in the hand on the role of attentional focus in physical and imagined STS movements. Experiment 4 studied the role of attentional focus in a training protocol employing motor imagery practice. Postural transition duration and transition stability during physical trials, self-reported movement times during physical and imagined trials, and ground reaction force and vividness of imagery during imagined trials were recorded. The results show that focusing attention on muscular effort not only benefitted older people’s motor performance, but also increased both the level and task-linked modulation of inadvertent force production during imagery (Experiment 1). Increasing the level of effort (by lowering seat height) resulted in better modulation of movement time as a function of effort level when older adults focused attention internally (Experiment 2). When a secondary task of holding a fluid container upright was added, external attentional focus benefitted both age groups (Experiment 3), indicating that the effects of attentional focus are task-linked. There was also a numerical indication that focusing attention on muscular load during motor imagery-based practice may be more effective in older adults (Experiment 4). These results suggest that kinesthetic imagery may be particularly consonant with the more internally focused motor control that benefits older people. Thus, training or rehabilitation protocols using kinesthetic imagery may serve more effectively as a form of practice for this age group by activating neural pathways similarly to their motor execution. On the other hand, young people consistently performed better under external attentional focus, and even modulated their force production during imagery better when externally focused. The focus on musculoskeletal dynamics that kinesthetic imagery requires may therefore correspond less closely to motor planning and control processes in this age group. Thus, pathways by which kinesthetic imagery can serve as practice are likely to be more indirect than for older people. These findings provide fundamental knowledge for further clinical research on patients who suffer disability in STS movements.
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Cullen, Michelle Kathleen. "Muscle-Driven Simulations of Sit to Stand Transfer in Persons with Severe Osteoarthritis." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429621874.
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Patil, Gaurav. "Uncontrolled manifold based controller for lower-body exoskeletons supporting sit-to-stand transitions." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563272986574752.
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Lu, Hang. "The development of an assistive chair for elderly with sit to stand problems." Thesis, University of Bedfordshire, 2016. http://hdl.handle.net/10547/622532.
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Standing up from a seated position, known as sit-to-stand (STS) movement, is one of the most frequently performed activities of daily living (ADLs). However, the aging generation are often encountered with STS issues owning to their declined motor functions and sensory capacity for postural control. The motivated is rooted from the contemporary market available STS assistive devices that are lack of genuine interaction with elderly users. Prior to the software implementation, the robot chair platform with integrated sensing footmat is developed with STS biomechanical concerns for the elderly. The work has its main emphasis on recognising the personalised behavioural patterns from the elderly users’ STS movements, namely the STS intentions and personalised STS feature prediction. The former is known as intention recognition while the latter is defined as assistance prediction, both achieved by innovative machine learning techniques. The proposed intention recognition performs well in multiple subjects scenarios with different postures involved thanks to its competence of handling these uncertainties. To the provision of providing the assistance needed by the elderly user, a time series prediction model is presented, aiming to configure the personalised ground reaction force (GRF) curve over time which suggests successful movement. This enables the computation of deficits between the predicted oncoming GRF curve and the personalised one. A multiple steps ahead prediction into the future is also implemented so that the completion time of actuation in reality is taken into account.
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Caruthers, Elena Joy Caruthers. "Investigating Lower Limb Muscle Function during the Sit to Stand Transfer and Stair Climbing." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1498569178798838.
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Woodbury, Ryan Kenneth. "Investigating sit-to-stand velocity and power to assess functional capacity in older people." Thesis, Woodbury, Ryan Kenneth (2022) Investigating sit-to-stand velocity and power to assess functional capacity in older people. Masters by Research thesis, Murdoch University, 2022. https://researchrepository.murdoch.edu.au/id/eprint/66125/.
Full textAbstract:
Portable inertial measurement units allow movement velocity and power to be measured during functional assessments for older people, providing comprehensive assessment of their functional capacity. This study investigated the reliability of PUSH Band 2.0 velocity and power during a single, five-repetition and thirty-second duration sit-to-stand (STS) in older adults, and the relationship of these data with other tests of functional capacity. Twenty-four older adults (14 female; age: 72±5) attended one familiarisation and two experimental testing sessions. Mean STS velocity and power were measured during both testing sessions. Additionally, dynamometry assessments of maximal voluntary contraction (MVC), rate of torque development (RTD) and muscular endurance were measured in one session, while a functional testing battery was performed in the other session. The level of significance was set at p ≤ 0.05. Velocity and power demonstrated excellent relative reliability for all STS tasks (intraclass correlation coefficient = 0.91-0.98). Single-repetition STS velocity observed moderate absolute reliability (coefficient of variation = 6.5%), while velocity and power during all other STS tasks observed good absolute reliability (CV = 3.2-4.8%). Velocity during one (r = -0.64-0.57), five (r = -0.53-0.46) and thirty-second STS (r = -0.51-0.42) correlated with all functional battery scores. Thirty-second STS velocity correlated with MVC (r = 0.41), but not endurance (r = 0.27-0.36) or RTD (r = 0.24-0.37). Power during one (r = 0.50), five (r = 0.62) and thirty-second STS (r = 0.67) significantly correlated with MVC. No other significant correlations were observed. Mean STS velocity and power should not replace functional capacity assessments. However, these data may assist practitioners to monitor improvements in movement velocity and power following exercise interventions or to quantify reductions in capacity following a period of inactivity.
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Jerome, Matthew. "Higher education: testing the efficacy of height adjustable sit-stand desks in college classrooms." Thesis, University of Iowa, 2017. https://ir.uiowa.edu/etd/5525.
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Sedentary behavior has been found to have independent and negative associations with several cardiometabolic risk factors while interrupting prolonged sedentary time may ameliorate these associations. College classrooms are a traditionally sedentary microenvironment and understudied setting for sedentary interventions. Introducing sit-stand desks into college classrooms may be an effective and sustainable approach to reduce classroom sedentary time of college students. The objective of this study was to test the efficacy of replacing seated desks with sit-stand desks in a college classroom on student’s classroom standing time and sit-stand transitions, as well as health-related and academic behaviors.
We recruited 304 undergraduate college students taking one of 14 classes being taught in one of two small classrooms (25 seats per class) to participate. Using a cross-over design, each student’s classroom sitting and standing time were measured by self-report and objectively (direct observation via video camera surveillance) after having access to only seated desks or only sit-stand desks for six continuous weeks. A process evaluation survey was administered at the end of the study to explore student’s and instructor’s perceptions of the intervention and its impact on student engagement.
The results suggest that students stood about 9.1% of class time on average when given access to sit-stand desks and about 1.95% of class time when using traditional seated desks, as measured by objective video surveillance data. There was no significant change in sit-stand transitions between sit-stand desks and seated desks. Students reported that a number of academic and health outcomes were favorably impacted as a result of using the sit-stand desks. Social acceptability appeared to be the biggest barrier to use of the sit-stand desks. Overall, students reported a desire to use sit-stand desks again in future classes.
Students stood significantly more when provided access to sit-stand desks compared to seated desks. Sit-stand transitions were not significantly increased when sit-stand desks were implemented. Significantly more students reported improvements in academic and health related outcomes than students who reported declines in these areas as a result of using sit-stand desks. A majority of students reported they would use sit-stand desk again in the future and be supportive of adding sit-stand desks to other classrooms on campus. Sit-stand desks are a feasible environmental change in a college classroom to reduce student sedentary time.
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Atkins, Karen L. Hastings. "Vibrotactile Postural Control in Patients That Have Sit-to-Stand Balance Deficit and Fall." Thesis, NSUWorks, 2010. https://nsuworks.nova.edu/hpd_pt_stuetd/52.
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Purpose: Vibrotactile displays have been found to be beneficial in improving balance test scores that correlate with a decrease in fall rate in laboratory studies. Investigations of these devices have been limited to upright stance and have not been done in clinical settings. Furthermore, transitional movements facilitated by vibrotactile displays, such as forward lean and rise found in sit-to-stand, have not been investigated. A prospective study investigated the relationship between force platform vibrotactile intervention and balance test scores, sit-to-stand and falls in subjects with abnormal NeuroCom Sit-to-Stand test results and 2 or more self-reported falls within the last 6 months. Subjects: Subjects included 30 community-dwelling adults, aged 60 to 79 years, 10 as off-site controls, 10 as on-site controls, and 10 as on-site device intervention subjects. Method: The cohort is a prospective case/control study using Pearson r, paired sample t-test, multivariate analysis of variance (M)ANOVA), and Wilcoxon signed rank analysis to determine the relationship between standard of care physical therapy plus vibrotactile force platform device treatment and standard of care physical therapy only. The Berg Balance Scale (BBS), Dynamic Gait Index, functional independence measure-motor (FIM-Motor), NeuroCom Sit-to-Stand normative ratios, NeuroCom Comprehensive Report, and self-reported falls quantify change over time with repeated measure study design. Results: The study found a significant beneficial effect in the device intervention group which realized 39.5/56 to 51.2/56 mean score increase in Berg Balance Score, increase in mean Dynamic Gait Index from 11.7/24 to 19.8/24, mean increase in FIM-Motor from 16.4/21 to 19.5/21 and decrease in self-report falls from 4 to 2 by intervention Day 14. These finds encourage further investigation of vibrotactile force platform devices.
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Bryanton, Megan. "The Influence of Muscular Fatigue on Human Multi-Joint Movement: Determinants of Sit-to-Stand Capacity with Aging." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35369.
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The sit-to-stand (STS) is a multi-articular movement of daily living that requires significantly higher knee extensor (KE) efforts compared to ankle and hip musculature, which approach near maximal levels in older adults populations. As well, fatigue may develop more readily with repetitive actions. Consequently, it is understandable how KE strength reserves have been previously correlated with both functional independence and STS strategy characteristics in older persons, and why STS capacity is a significant predictor of disability. However, it is still unclear why compensatory movement strategies manifest when rising from a seated position, and how this may be influenced by aging. The purpose of this thesis compilation was to evaluate alterations in muscular contributions at the ankle, knee, and hip, in relation to STS performance strategies in young and older adults either: a) with repetitive multi-joint STS exercise or b) before and after isolated fatigue of KE musculature. Results showed that aging caused a redistribution of joint torques when ascending from a seated position, and was associated with significantly higher quadriceps muscular efforts in older persons in comparison to their younger counterparts. In contrast, young and older adults exhibited similar compensatory movement and loading strategies during repetitive STS exercise, which appeared to be limited by the ability to sustain KE force output. In turn, lower KE strength reserves of older persons were responsible for their disproportionately higher quadriceps efforts and reduced STS capacities. Young and older persons also appeared to employ motor strategies to compensate for reduced KE force output via increased contribution of the biarticular rectus femoris within the quadriceps KE synergy, as well as through increases in the initially less active ankle plantar flexor and hip extensor musculature. Older adults may benefit from strengthening of thigh extensor musculature to maintain or improve their strength reserves to promote independent living.
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Castellini, Michael. "Sit In, Stand Up and Sing Out!: Black Gospel Music and the Civil Rights Movement." Digital Archive @ GSU, 2013. http://digitalarchive.gsu.edu/history_theses/76.
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This thesis explores the relationship between black gospel music and the African American freedom struggle of the post-WWII era. More specifically, it addresses the paradoxical suggestion that black gospel artists themselves were typically escapist, apathetic, and politically uninvolved—like the black church and black masses in general—despite the “classical” Southern movement music being largely gospel-based. This thesis argues that gospel was in fact a critical component of the civil rights movement. In ways open and veiled, black gospel music always spoke to the issue of freedom. Topics include: grassroots gospel communities; African American sacred song and coded resistance; black church culture and social action; freedom songs and local movements; socially conscious or activist gospel figures; gospel records with civil rights themes.
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Mukherjee, Gaurav. "Design and Development of an Assistive Exoskeleton for Independent Sit-Stand Transitions among the Elderly." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1407407328.
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Marine, Brandon K. "A Computational Study of the Kinematics of Femoroacetabular Morphology During A Sit-to-Stand Transfer." VCU Scholars Compass, 2017. https://scholarscompass.vcu.edu/etd/5189.
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Computational modeling in the field of biomechanics is becoming increasingly popular and successful in practice for its ability to predict function and provide information that would otherwise be unobtainable. Through the application of these new and constantly improving methods, kinematics and joint contact characteristics in pathological conditions of femoroacetabular impingement (FAI) and total hip arthroplasty (THA) were studied using a lower extremity computational model. Patients presenting with FAI exhibit abnormal contact between the femoral neck and acetabular rim leading to surrounding tissue damage in daily use. THA is the replacement of both the proximal femur and acetabular region of the pelvis and is the most common surgical intervention for degenerative hip disorders. A combination of rigid osteoarticular anatomy and force vectors representing soft tissue structures were used in developing this model. Kinematics produced by healthy models were formally validated with experimental data from Burnfield et al. This healthy model was then modified to emulate the desired morphology of FAI and a THA procedure with a range of combined version (CV) angles. All soft tissue structures were maintained constant for each subsequent model. Data gathered from these models did not provide any significant differences between the kinematics of healthy and FAI but did show a large amount of variation in all THA kinematics including incidents of dislocation with cases of lower CV angles. With the results of these computational studies performed with this model, an increased understanding of hip morphology with regards to STS has been achieved.
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Russell, Lisa Y. "Where you stand depends on where you sit, Canada and reform of the United Nations organization." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0016/MQ49436.pdf.
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JOB, MIRKO. "Development of a real-time classifier for the identification of the Sit-To-Stand motion pattern." Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1049508.
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The Sit-to-Stand (STS) movement has significant importance in clinical practice, since it is an indicator of lower limb functionality. As an optimal trade-off between costs and accuracy, accelerometers have recently been used to synchronously recognise the STS transition in various Human Activity Recognition-based tasks. However, beyond the mere identification of the entire action, a major challenge remains the recognition of clinically relevant phases inside the STS motion pattern, due to the intrinsic variability of the movement. This work presents the development process of a deep-learning model aimed at recognising specific clinical valid phases in the STS, relying on a pool of 39 young and healthy participants performing the task under self-paced (SP) and controlled speed (CT). The movements were registered using a total of 6 inertial sensors, and the accelerometric data was labelised into four sequential STS phases according to the Ground Reaction Force profiles acquired through a force plate. The optimised architecture combined convolutional and recurrent neural networks into a hybrid approach and was able to correctly identify the four STS phases, both under SP and CT movements, relying on the single sensor placed on the chest. The overall accuracy estimate (median [95% confidence intervals]) for the hybrid architecture was 96.09 [95.37 - 96.56] in SP trials and 95.74 [95.39 – 96.21] in CT trials. Moreover, the prediction delays (≅33 ms) were compatible with the temporal characteristics of the dataset, sampled at 10 Hz (100 ms). These results support the implementation of the proposed model in the development of digital rehabilitation solutions able to synchronously recognise the STS movement pattern, with the aim of effectively evaluate and correct its execution.
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Morita, Andrea Akemi. "Qual é o melhor protocolo do teste sit-to-stand em pacientes com doença pulmonar obstrutiva crônica." Universidade Estadual de Londrina, Universidade Norte do Paraná. Centro de Ciências da Saúde. Programa de Pós-Graduação em Ciências da Reabilitação, 2016. http://www.bibliotecadigital.uel.br/document/?code=vtls000206571.
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INTRODUÇÃO: Existem diferentes protocolos do teste sit-to-stand (STS) para avaliação da capacidade funcional em pacientes com doença pulmonar obstrutiva crônica (DPOC). Entretanto, não existem evidências sobre qual é o melhor protocolo a ser utilizado nessa população. OBJETIVOS: Correlacionar cada protocolo do STS (5-repetições [5-rep], 30-segundos [30-seg] e 1-minuto [1-min]) com desfechos clínicos importantes avaliados em pacientes com DPOC; comparar os três protocolos do STS assim como verificar a associação e a concordância entre eles; verificar se os três protocolos são capazes de predizer a capacidade funcional de exercício e atividade física de vida diária (AFVD). MÉTODOS: Vinte e três pacientes com DPOC (11 homens; VEF1: 53±15%pred) realizaram três protocolos do teste STS de forma aleatorizada. Considerando que os desfechos dos protocolos foram obtidos em unidades de medida diferentes, a velocidade (número de repetições por segundo [rep/seg]) foi utilizada para a análise dos três testes. Além disso, os pacientes foram submetidos às seguintes avaliações: Incremental Shuttle Walking Test (ISWT), Teste de Caminhada de 6 Minutos (TC6min), 4-metre gait speed test (4MGS), 1-repetição máxima (1RM) de quadríceps femoral, avaliação da atividade física de vida diária (AFVD) e questionários de qualidade de vida e estado funcional. RESULTADOS: O protocolo de 1-min correlacionou-se significativamente com o TC6min (r=0,40), 4MGS (r=0,64) e AFVD (r≥0,47). Para os testes de 5-rep e 30-seg, as melhores correlações obtidas foram com o 4MGS (r=0,54 e r=0,52, respectivamente). Foi encontrada diferença na velocidade de execução dos três protocolos (5-rep: 0,53±0,16 rep/seg; 30-seg: 0,48±0,13rep/seg; 1-min: 0,45±0,11rep/seg; P= 0,01), ou seja, entre o STS de 5-rep e 1-min. Apesar dessa diferença, eles apresentaram boa concordância (CCI≥0,73 para todos) e houve moderada associação entre eles (r≥0,68). Foram verificadas maiores mudanças na saturação periférica de oxigênio, frequência cardíaca, pressão arterial e sintomas de dispneia e fadiga após o protocolo de 1-min (P≤0,01 para todos). Além disso, os três protocolos foram capazes de discriminar pacientes com capacidade de exercício baixa e preservada (Área sob a curva [AUC]≥0,71). No entanto, isso não ocorreu com a AFVD (AUC≤0,67). CONCLUSÃO: O teste de 1-min apresenta maior demanda hemodinâmica, e é o que melhor correlaciona-se com importantes desfechos clínicos avaliados em pacientes com DPOC. Apesar de ter sido verificada diferença na velocidade de execução e na resposta fisiológica entre o STS de 5-rep e 1-min, há boa concordância e correlação entre os três diferentes protocolos do STS. Adicionalmente, todos os protocolos possuíram poder discriminativo para pacientes com capacidade de exercício baixa e preservada.BACKGROUND: Different protocols of the sit-to-stand test (STS) are available to assess functional capacity in patients with chronic obstructive pulmonary disease (COPD). However, it is unclear which is the best protocol to assess this population. AIMS: To correlate each protocol of the STS (5-repetition [5-rep], 30-second [30-sec] and 1-minute [1-min]) with important clinical outcomes in patients with COPD; to compare three STS, as well as to verify their association and agreement; and to verify whether the three protocols are able to predict functional exercise capacity and physical activity in daily life (PADL). METHODS: Twenty-three patients with COPD (11 men; FEV1:53±15%pred) performed three protocols of the STS in a randomized sequence. Since the outcomes units of measure were different, the speed (number of repetitions per second [rep/sec]) was used for the analysis of all three tests. Patients also underwent the following assessments: Incremental Shuttle Walking Test (ISWT), 6-minute walk test (6MWT), 4-metre gait speed test (4MGS), 1-repetition maximum (1RM) of quadriceps muscle, PADL and questionnaires of health-related quality of life and functional status. RESULTS: The 1-min presented significant correlations with the 6MWT (r=0.40), 4MGS (r=0.64) and PADL (r≥0.47). Regarding the 5-rep and 30-sec test, the best correlation obtained were with the 4MGS (r=0.54 and r=0.52, respectively). The speed differed among protocols (5-rep:0.53±0.16 rep/sec; 30-sec: 0.48±0.13rep/sec; 1-min: 0.45±0.11rep/sec; P= 0.01), i.e. between the 5-rep and 1-min STS. However, they presented moderate agreement (ICC≥0.73 for all) and correlated well with each other (r≥0.68). More marked changes in peripheral oxygen saturation, heart rate, blood pressure, dyspnea and leg fatigue were observed after the 1-min protocol (P≤0.01 for all). Furthermore, the three protocols were able to discriminate patients with low and preserved exercise capacity (area under the curve [AUC]≥0.71) but did not predict PADL (AUC≤0.67). CONCLUSION: The 1-min STS generates higher hemodynamic demands and correlates better with clinical outcomes in patients with COPD. Although there was difference between the 5-rep and 1-min protocol in terms of speed performance and physiologic demand, there was good level of agreement among the STS. In addition, all three protocols discriminated patients with low and preserved exercise capacity.
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Walaszek, Michelle Christine. "Central and Peripheral Weight Gain Affect Trunk Kinematics and Lower-Extremity Muscle Activation Differently During Sit-To-Stand." UKnowledge, 2016. http://uknowledge.uky.edu/khp_etds/34.
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Background: Obesity-induced alterations in biomechanics and muscle recruitment during activities of daily living, such as sit-to-stand (STS) are often attributed to increases in adipose tissue (AT) mass. Central or peripheral distribution of AT may differently affect biomechanics and muscle recruitment.
Methods: Fifteen healthy, normal weight (BMI 22.4 ± 1.9 kg/m2, 24.1 ± 4.2 years) subjects volunteered. External loads equivalent to a 5 kg/m2 BMI increase were applied in three conditions: unloaded (UN), centrally loaded (CL), and peripherally loaded (PL). Subjects completed three successful STS movements in a backless chair under each load condition in random order. Motion analysis and lower extremity surface electromyography (EMG) were measured.
Results: Compared to UN and CL, PL significantly increased support width during STS. PL also significantly increased maximum trunk flexion compared to CL. Peak and total VM EMG activity were significantly increased during CL, compared to UN and PL. During CL, peak VL EMG activity was significantly greater than UN.
Conclusions: Central and peripheral weight gain induce different biomechanical adaptations during STS. Central weight gain increases knee extensor muscle activity during STS independent of biomechanical changes. In contrast, peripheral weight gain increases support width and trunk flexion with minimal EMG changes during STS.
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Alamini, Rodrigues Caroline. "Influence de la mobilité de la colonne vertébrale sur les composantes posturale et focale du transfert assis-debout." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30376/document.
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Il est connu que le mouvement volontaire entraîne une perturbation de la posture, qui nécessite d'être compensée par des mouvement contre-perturbateurs définis comme " ajustements posturaux ". Ce processus dynamique, qui se produit avant, pendant et après le mouvement focal, nécessite la mobilité de la chaîne posturale, avec un patron spécifique pour chaque tâche.L'objectif de cette thèse de doctorat a été d'explorer l'influence de la mobilité du rachis sur les composantes focale et posturale du transfert assis- debout, ou sit-to-stand (STS), qui est une tâche indispensable à l'autonomie fonctionnelle. Trois séries expérimentales ont évalué l'effet d'une restriction de mobilité de la colonne vertébrale sur les ajustements posturaux anticipateurs (APAs) et le mouvement focal de la tâche de STS réalisée à vitesse maximale. Des paramètres biomécaniques ont été calculés à partir des données fournies par un plateau de forces et un capteur de pression. La première série a évalué l'effet de la mobilité lombo-pelvienne au moyen de trois types de contentions lombaires, et a montré qu'une réduction du jeu articulaire de cette région était associée des APAs plus longs et plus amples, ainsi qu'à une augmentation de la durée du mouvement focal. La seconde série a mis en évidence les mêmes variations en explorant l'influence de la mobilité de la colonne cervicale au moyen de trois contentions cervicales. La dernière série s'est focalisée sur le rôle de l'augmentation de la tension musculaire le long du tronc, en utilisant un protocole spécifique de compression bimanuelle. Les résultats ont montré qu'une tension musculaire plus élevée induisait une augmentation de la durée des APAs mais sans variation de la durée du mouvement focal. L'ensemble de ces résultats suggèrent que la colonne cervicale et la colonne lombaire sont à la fois impliquées dans les composantes focale et posturale du STS, et que le maintien de leur mobilité peut favoriser l'autonomie fonctionnelle. En revanche, l'augmentation de la tension musculaire le long du tronc nécessite uniquement une réorganisation des ajustements posturaux pour maintenir le même niveau de performanceIt is well known that voluntary movements induce internal disturbances to posture, which need to be balanced by counter-pertubing movements defined as " postural adjustments ". This dynamic process, which occurs before, during, and after the focal movement, requires the mobility of the postural chain, with a specific pattern for each task. The aim of this PhD thesis was to explore the influence of spine mobility on the focal and postural components of the sit-to-stand (STS) task, which is instrumental for functional autonomy. Three series of experiments assessed the effect of spine mobility restriction on anticipatory postural adjustments (APAs) and focal movement (FM) of the STS task peformed at maximum velocity. Biomechanical parameters were calculated from force plate, and pressure sensor data. The first series assessed the effect of lumbo-pelvic mobility using three different lumbar contentions, and showed that restricted articular free play in this area was associated with longer and larger APAs, along with a higher duration of the focal movement. The second series of experiment showed the same variations when exploring the effect of cervical spine mobility using three different cervical contentions. The last series focused on the effect of increased muscular tension along the trunk, using a specific bimanual compressive load paradigm.The results showed that higher tension lead to longer APAs with no variation of FM duration. Taken together, these findings suggest that the lumbar and cervical spine are involved in both the focal and postural components of the STS task, and that preserving their articular free play might be useful to favour functionnal autonomy. In contrast, increased muscular tension along the trunk only require a reorganization of the APAs to keep the same level of task performance
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Eby, Wesley R. "Feasibility Analysis of a Powered Lower-Limb Orthotic for the Mobility Impaired User." Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/952.
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Powered orthotic devices can be used to restore mobility to the impaired user, and may thereby assist them in daily living tasks. An investigation is performed herein to examine the feasibility of a powered lower-limb orthotic in assisting the sit-to-stand task by 50% of the required torque. Feasibility is considered via simulation.
A three-link sit-to-stand model, which is driven by kinematic data, is developed. Models of a Pneumatic Muscle Actuator and a DC motor are used to determine which of the two technologies can make a more appropriate contribution to the sit-to-stand task. Simulation revealed that both the Pneumatic Muscle Actuator and the DC motor are reasonable actuator choices, and neither limited the ability to achieve 50% torque assistance. The ability to assist the task was, however, limited by the ability to derive a control signal for the actuator from the user-orthotic interface.
It was concluded that the user-orthotic interface requires further investigation. It was also found that while both actuator technologies are suitable for contributing 50% of the required torque, the Pneumatic Muscle Actuator is preferable due to its ability to scale to greater torques.
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Fujimoto, Masahiro, and Masahiro Fujimoto. "Dynamic Limits of Balance Control during Daily Functional Activities Associated with Falling." Thesis, University of Oregon, 2012. http://hdl.handle.net/1794/12532.
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Falls are one of the most serious problems among the elderly, resulting in fatal physical injuries. Early identification of people at a high risk of falling is needed to facilitate rehabilitation to reduce future fall risk. The overall goal of this dissertation was to develop biomechanical models that identify dynamic limits of balance control in daily functional activities associated with falling, including sit-to-stand (STS) movement, standing (stance perturbation), and walking. Poor performance of STS movement has been identified as one of the risk factors of falls among elderly individuals. We proposed a novel method to identify dynamic limits of balance control during STS movement using whole body center of mass (COM) acceleration and assessed its feasibility to differentiate individuals with difficulty in STS movement from healthy individuals. The results demonstrated that our model with COM acceleration could better differentiate individuals with difficulty in STS movement from healthy individuals than the traditional model with COM velocity. Poor postural control ability is also a risk factor of falls. Postural recovery responses to backward support surface translations during quiet standing were examined for healthy young and elderly adults. The results demonstrated that functional base of support (FBOS) and ankle dorsiflexor strength could be sensitive measures to detect elderly individuals with declined balance control. Our biomechanical model, which determines a set of balance stability boundaries, showed a better predictive capability than the statistical model for identifying unstable balance recovery trials, while the statistical model better predicted stable recovery trials. Lastly, walking requires a fine momentum control where COM acceleration could play an important role. Differences in control of dynamic stability during walking were examined with our proposed boundaries of dynamic stability. Elderly fallers adapted a more conservative gait strategy than healthy individuals, demonstrating significantly slower forward COM velocity and acceleration with their COM significantly closer to the base of support at toe-off, which could be indicative of a poor momentum control ability.
Overall, this study demonstrated that COM acceleration would provide further information on momentum control, which could better reveal underlying mechanisms causing imbalance and provide an insightful evaluation of balance dysfunction.
This dissertation includes unpublished co-authored material.
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Szajcz, Nicole E. "The effects of an aquatics exercise program on sit to stand mechanics, flexibility, and balance in a group of arthritic women." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ62858.pdf.
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Jones, Stephanie. "Postural control impairment characteristics of chronic, recurrent low back pain: an investigation of automatic postural responses and sit-to-stand movements." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=96996.
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Evidence is accumulating that individuals with chronic low back pain (LBP) have altered movement coordination; however, the exact nature of this impairment is unknown. To clarify the relationship between pain and altered coordination this thesis characterized postural control in two cohorts of individuals with LBP (those with a history of pain who were in a quiescent period and those who were in an active pain period), relative to individuals without LBP. Automatic postural responses (APRs) as measured by joint torque and myoelectric responses were characterized following multi-directional support surface translations. Given that the active pain cohort had greater pain than the quiescent group, they might be more susceptible to volitional effects on movement. Therefore this cohort as well as the control group also performed a voluntary activity of daily living, the sit-to-stand (STS) movement, to quantify the influence of pain on a volitional movement. Their performance was then compared to the performance of the healthy control group. The first study demonstrated that the APRs of healthy individuals used a redistribution of the contributions of hip/trunk vs. ankle torques depending on the perturbation direction. The relative contribution of joint torques appears to be determined by the biomechanical constraints imposed by a specific perturbation direction. In the second study, individuals with LBP in a quiescent period demonstrated increased sagittal plane ankle torque during the passive epoch (50-100ms after perturbation onset) and reduced peak trunk torques following perturbation, suggesting that they may have increased stiffness at the ankle and use a response strategy of active trunk stiffening, due to co-contraction of musculature. In the third study, individuals with LBP in an active pain episode demonstrated earlier but not altered peak torque magnitudes, and increased muscle activation, which may indicate increased muscle spindle sensitivity or increased postural gain. In the fourth study individuals with active LBP performed the STS movement with no speed alterations but with a strategy that relied more on distal joint contributions, which may reflect a cognitive decision to restrict trunk excursion. En masse, these findings suggest that altered movement strategies persist in the chronic, recurrent LBP population between painful episodes, which may reflect an intention to restrict trunk movement. Individuals with chronic LBP who are in an exacerbation of their pain appear to have a generalized heightened postural response to unexpected perturbation that may reflect a short-term modification to a heightened pain state. These individuals also move to restrict their trunk during volitional movements such as the STS. Such alterations, if repeated, may lead to persistent abnormal movement patterns that could increase the susceptibility to future LBP episodes, as demonstrated by individuals in a quiescent period of their pain cycle. Interventions that focus on a return to increased variability and distribution of movement could enhance movement precision, through tissue and neuromuscular changes, and lead to a reduction of the frequency and severity of pain recurrence.Il est de plus en plus démontré que la coordination des mouvements est altérée chez les individus souffrant de douleur chronique au dos (DCD). Toutefois, la nature exacte de cette déficience demeure inconnue. Afin de clarifier la relation entre la douleur et la coordination des mouvements, l'objectif de cette thèse était de caractériser et comparer les stratégies de contrôle postural chez deux groupes d'individus souffrant de DCD (ceux ayant déjà eu de la douleur mais étant dans une période quiescente et ceux souffrant présentement de douleur) et chez un groupe de sujets n'ayant jamais souffert de DCD. Les réponses posturales automatiques (RPAs), telles que mesurées par les moments de force articulaires et les réponses myoélectriques, ont été examinées suite à la présentation de brefs déplacements multidirectionnels, en translation, de la surface de support. Comme les individus souffrant de DCD en période active étaient plus susceptibles de montrer un comportement altéré dans leurs mouvements, ils ont également exécuté une activité de la vie quotidienne, soit de passer de la position assise à la position debout, afin de quantifier l'influence de la douleur sur un mouvement volontaire. Leur performance a pu être comparée à celle des personnes en santé. Les résultats de la première étude ont démontré que les RPAs des individus en santé impliquent une redistribution des contributions des moments à la hanche et au tronc par rapport aux moments aux chevilles, qui dépend de la direction de la perturbation. La contribution relative des moments articulaires semble être déterminée par les contraintes biomécaniques imposées par la direction spécifique de la perturbation. Dans la seconde étude, le moment à la cheville, dans le plan sagittal et pendant la période passive (soit 50-100 ms après le début de la perturbation), était plus grand chez les individus avec DCD en période quiescente alors que la valeur maximale du moment au tronc était diminuée en réponse à la perturbation. Ces résultats suggèrent que ces individus ont peut-être augmenté la rigidité passive de leurs chevilles et utilisé une stratégie de raidissement actif du tronc, grâce à la co-contraction musculaire. Dans la troisième étude, les individus souffrant de DCD avec douleur active ont montré des pics de moments plus tôt, mais de même amplitude, ainsi qu'une activation musculaire augmentée, ce qui peut indiquer une sensibilité accrue des fuseaux musculaires ou un gain postural amplifié. Les résultats de la quatrième étude n'ont pas révélé de différence dans la vitesse d'exécution de la tâche assis-debout chez les individus souffrant de DCD avec douleur active. Cependant, ils semblent avoir opté pour une stratégie reposant plus sur la contribution des articulations distales, ce qui peut paraître comme une décision cognitive visant à restreindre l'excursion du tronc. L'ensemble des résultats obtenus démontre que des stratégies de mouvement altérées persistent chez les individus souffrant de DCD avec épisodes de douleur active, reflétant une intention de restreindre le mouvement au niveau du tronc. Les personnes ayant une DCD et qui sont dans une période où la douleur est présente semblent avoir une réponse posturale augmentée généralisée suite à une perturbation inattendue, ce qui peut être l'expression d'une modification à la hausse, à court terme, de leur état de douleur. Ces individus bougent également en limitant les mouvements du tronc lors de mouvements volontaires comme celui de passer de la position assise à la position debout. Ces changements, s'ils sont répétés, peuvent conduire à l'utilisation persistante de patrons de mouvements anormaux qui peuvent entraîner une susceptibilité à des épisodes de douleur au dos dans le futur.
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Desrosiers, Graeme. "Sit Down, Stand Up." Thesis, 2013. http://spectrum.library.concordia.ca/977598/1/Desrosiers_MA_F2013.pdf.
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Sit Down, Stand Up is the story of Jamie Milan, a creatively and financially frustrated young man who has moved from Vancouver to Montreal to pursue a romantic relationship with folksinger Amy Webb and, he hopes, a career in stand up comedy. The novella begins with the abrupt end of his relationship and details his attempts to win Amy back. The action takes place in several bars and performance venues around the city, as well as the soap factory where Jamie works for low wages and interacts with a group of immigrant co-workers. It explores Jamie’s attempts to develop a more mature attitude towards women, and people in general, and to overcome his insecurities and find a creative voice. It is also a novella about failures of communication, and about the occasional successes that occur despite the many barriers that exist between the characters.
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Chao, Yu-Hung, and 趙寓宏. "A Study of Sit-Stand Workstation Design." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/32632729559982202914.
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碩士朝陽科技大學
優質化產品設計產業研發碩士專班
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This technical report of the University Centre of Industrial academic cooperation in the quality of the product design industry case of Modernsolid , in between October 2010 to March 2015 in order to improve and innovation of computer workstations as the theme for technical research design , for which it has the Modernsolid mobile computer workstation product lines improved . And a kind desktop workstation of Modernsolid not have the product design and development. Therefore, this technical report will be divided into two parts to make technical statements , First one is for the mobile computer workstation expand and improve its existing product line ; the current mobile computer workstations popular place in the main is medical and health care department , experience of health facilities in carrying carts was most abundant, so this study will be to do analysis use medical facilities and other places of common projects to begin and design improvement , and drive products more match the in workplace user's use of intuition and logic . Second, for the desktop computer workstations sit-stand workstation development and design. desktop computer Sit-Stand workstation popular place in the main is office computer job , so this study will be to do analysis use it to the operation of office project and to do innovation design, and drive product more match the in office user's use of intuition and logic 、 habits. In the mobile computer workstation except the reserch and issue improvement of original product, but also will expand the product line by adding Modernsolid and Feng Chia University Industry Cooperation with academic centers research results of the intelligent computer interface and the motor drive unit electronically controlled of mobile health care carts, iand the else is to develop and design simplely and low-cost mobile carts to expand the product line . The research and innovation of Desktop computer Sit-Stand Workstation could help to find and analysis the way who match the Modernsolid Desktop computer Sit-Stand Workstation product line , and the design and proofing test ; make the computer work stations Modernsolid of the product line can be more complete and meet the needs of the users.
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Shiao, Eric Chiwei, and 蕭季威. "Ergonomic sit-to-stand and stand-to-walk support system for the elderly." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/bpk8v5.
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碩士國立臺灣大學
生醫電子與資訊學研究所
106
Recently, the aging trend has become obvious in the world’s population, and it is especially severe in Taiwan due to low fertility. Hence, the health care of the elderly has become an essential topic. With aging, the degeneration of physiological functions, such as muscle force, muscle endurance, and balance ability, makes the elderly hard to perform sit-to-stand and walk (STSW), which is frequent in daily lives. The elderly need support from others or lifts to be capable of standing up and walking. Hence, the elderly will decrease activity and tend to lie in bed or sit on a wheelchair for longer time. With decreasing activity, their metabolic rates decline and the elderly are more vulnerable to cardiovascular diseases. Additionally, the quality of life will decline. There is an increasing number of lifts developed to help the elderly standing and walking. However, there are drawbacks in the existing lifts that should be improved. One is their lack of ability to lift the elderly people with a good posture to stand up normally and the second is their lack of an appropriate support during the standing and walking process. Therefore, the aim of this research is to develop a home-care smart STSW lift system, which can support the elderly to stand in a normal movement and provide them with partially body weight support during the standing and walking process. Making it easier for the elderly to stand up, the designing system can motivate them to do active rehabilitation exercise every time they stand up and walk. In this study, we executed a kinematic experiment to find out the precise position of each body segment during a normal sit-to-stand movement and got the curve of standing. We also carefully designed the basic structure of STSW lift, and calculated numerically the needed supporting force, the stress and the safety factors with its 3D model. Calculation of the data of these standing-curves and results from simulations provide detail information to finish the design and define the precise dimension of STSW lift. During the design process, we built the working prototypes to test each design ideas at the same time. After the evolution of nine generations of designs and prototypes, we finally built the home-care smart STSW lift system. The system was finished after a series of well evaluation and selection of materials and components of the mechanism, power module, power transmit module, move and brake module and the sensor and control module of the home-care smart STSW lift system. At the last, we executed some experiments of kinematic, exercise intensity, electromyography (EMG) and supporting force to verify the standing-curves and intensity of active rehabilitation exercise when a user standing with the home-care smart STSW lift system. After all, the researcher finally designed and built a home-care smart STSW lift system which can not only support the elderly to stand in a normal sit-to-stand movement but also let them do active rehabilitation exercise at the same time. We expect this innovated home care smart STSW lift system can encourage the elders to stand up and move around. By doing so, the elderly can postpone the degeneration of the muscle force, and thus they can have longer life span and better life qualities.
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Gray, CHARLA. "Sit-to-stand performance in people with stroke and the effect of constraint-induced movement strategies on sit-to-stand performance." Thesis, 2013. http://hdl.handle.net/1974/8126.
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Asymmetry of weight-bearing and impaired ability to maintain centre of pressure in midline contribute to an increased fall risk during sit-to-stand in people with stroke. The main objective of this thesis was to investigate the effect of constraint-induced movement strategies on affected limb weight-bearing and measures of balance in people with stroke. Four studies were conducted to achieve this objective. Study one and two investigated the methodology for describing sit-to-stand performance in people with stroke and reliability of measures of sit-to-stand performance. Findings from study one demonstrated that methods for describing sit-to-stand performance in healthy adults are not feasible in people with stroke and established a method for describing sit-to-stand performance in subsequent studies. Findings from the second study demonstrated within and between day reliability of temporal, weight-bearing and displacement measures of sit-to-stand performance in both groups.
The third study of this thesis described impairments of sit-to-stand performance in people with stroke when compared with healthy age and sex matched adults. The findings confirmed results from previous studies and further described sit-to-stand performance by demonstrating a shift in the frontal plane centre of pressure and centre of mass position toward the unaffected limb at seat-off in people with stroke. The final study investigated the effect of three constraint-induced movement strategies on sit-to-stand performance in people with stroke. The results demonstrated increased affected limb weight-bearing and a shift of the centre of pressure and centre of mass toward midline with all of the strategies. Only two of the strategies altered centre of pressure and centre of mass displacement in the sagittal plane.
Findings from this body of research provide new information regarding the methodology of describing sit-to-stand performance in people with stroke and the reliability of measures of sit-to-stand performance. The results also provide an advanced understanding of sit-to-stand performance in people with stroke and the effect of constraint-induced movement strategies on sit-to-stand performance. Additional research using constraint-induced movement strategies in a randomized controlled trial will inform clinical practice and may reduce the fall risk in people with stroke.Thesis (Ph.D, Rehabilitation Science) -- Queen's University, 2013-07-24 13:30:53.585
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Fernandes, Francisco. "Sit-To-Stand movement analysis using the Kinect platform." Dissertação, 2013. http://hdl.handle.net/10216/75415.
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Fernandes, Francisco José Macedo. "Sit-To-Stand movement analysis using the Kinect platform." Master's thesis, 2013. https://repositorio-aberto.up.pt/handle/10216/68549.
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Fernandes, Francisco José Macedo. "Sit-To-Stand movement analysis using the Kinect platform." Dissertação, 2013. https://repositorio-aberto.up.pt/handle/10216/68549.
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Wang, He. "A biomechanical analysis of the single-radius and multi-radius total knee arthroplasty systems for the sit-to-stand and stand-to-sit." 2002. http://purl.galileo.usg.edu/uga%5Fetd/wang%5Fhe%5F200208%5Fphd.
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Kuo, Yi-Ling, and 郭宜怜. "Dynamic Spasticity and Its Relationship with Correlative Factors and Cortico-muscular Processing during Sit-to-stand and Stand-to-sit Tasks among Stroke Survivors." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/73632286758172348914.
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碩士國立陽明大學
物理治療暨輔助科技學系
101
Background: Spasticity is one of the features of upper motor neuron syndrome, which is characterized by a velocity-dependent response in the tonic stretch reflex. The abnormal movements of patients with stroke may result from impaired abilities associated with cortico-muscular processing and sensorimotor integration, which are related to abnormal spinal reflex conductivity. Since spasticity changes during movement, “dynamic spasticity” is a key factor that needs to be analyzed when the patients are moving. Both sit-to-stand (SitTS) and stand-to-sit (StandTS) are important tasks in our daily lives. Some evidence has revealed that several attributing factors of these two tasks, such as balance and muscle strength, are influenced by spasticity among patients with stroke. Therefore, dynamic spasticity may correlate with balance ability and muscle strength during movements. Moreover, the relationship between dynamic spasticity and task performance as well as cortico-muscular processing, remain unknown. Purposes: (1) To examine the correlation between lower extremity dynamic spasticity and muscle strength, balance as well as task performance during SitTS and StandTS tasks among stroke survivors. (2) To examine the correlation between lower extremity dynamic spasticity and cortico-muscular coherence as well as latency while the patients perform these two tasks. Methods: Twenty-five patients with first-onset stroke were recruited. When each subject performed these two tasks, the muscle activation of the affected gastrocnemius and rectus femoris was collected by electromyography (EMG) and the muscle lengthening velocity was collected by electronic goniometers. The EMG and muscle lengthening velocity were combined for calculating the composite spasticity indices of the lower extremities. The electroencephalography (EEG) collected the cortical activity signals of the motor-related cortices, which were combined with the EMG signals to analyze the cortico-muscular processing ability, namely coherence and latency. Muscle strength was assessed by the lower extremity part of Motricity index (MI-LE). Balance ability was assessed by the Berg Balance scale (BBS). The time required for performing these two tasks and the sitting impact force in the StandTS task were measured as performance outcomes. Pearson’s correlation coefficient analyses were applied to reveal the correlation between dynamic spasticity and all other outcomes. Results: Only the scores of MI-LE showed significant negative correlation with composite spasticity indices in StandTS task (r = -0.44, p = 0.03). No significant correlation was found between composite spasticity indices and all other outcomes in SitTS task. For neurophysiological outcomes, the average peak values of EEG-EMG coherence happened in the 13- to 30-Hz frequency band (β-band) mostly in both tasks. Discussion and Conclusion: The dynamic spasticity is negatively related to the muscle strength of the lower extremity, yet it does not correlate with the stroke survivors’ functional balance, performance and cortico-muscular processing abilities in SitTS and StandTS tasks.
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Tsai, I.-Jung, and 蔡依蓉. "Effects of Achilles tendon vibration on sit-to-stand movement." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/35270066372892748085.
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碩士國立成功大學
物理治療研究所
95
Background and purpose: Sit-to-stand movement is an important functional task in our daily life. Factors which would influence sit-to-stand movement are worth of investigation. Proprioceptive inputs from the ankle joint provide information regarding the foot placement, which is known to affect the sit-to-stand movement. Thus, the aim of this study was to investigate how additional proprioceptive inputs from bilateral sides and unilateral side of ankle joint affected the performance of sit-to-stand. Methods: 25 healthy young adults required to perform proprioceptive test and sit-to-stand test under 3 conditions: no vibration (NV), bilateral vibration (BV), and unilateral vibration (UV). Mechanical vibrators were placed on the Achilles tendons to induce erroneous proprioceptive inputs. In proprioceptive test, subjects with blindfold needed to point out the anterior site of big toe. In sit-to-stand test, subjects required to stand up with the blindfold and arms across the chest at their selected speeds. VICON system and force plate were used to collect performance of sit-to-stand. Results of proprioceptive test, and sit-to-stand characteristics including task duration, seat-off time, trunk inclination, maximum trunk segment forward velocity, maximum trunk segment forward acceleration, peak vertical ground reaction force, onset of peak vertical ground reaction force, and movement characteristics of center of pressure were used to analysis. Repeated measure ANOVA was used to compare the difference between three conditions. Significant level was p<0.05. Results: In proprioceptive test, subjects in BV showed erroneous sensation of foot placement which was posterior than real position. In sit-to-stand test, subjects in BV and UV showed earlier seat-off and onset of peak vertical ground reaction force than NV. BV and UV also show larger trunk inclination forward velocity and acceleration than NV. In addition, BV showed less COP trajectory and peak to peak range in medial-lateral direction than NV and UV. However, there was no significant difference between three conditions in task duration, trunk inclination forward displacement, and peak vertical ground reaction force. Conclusion: In this study, we found out vibration-induced erroneous proprioceptive inputs from bilateral ankle joints could cause illusory sensation of posterior foot placement. In addition, erroneous proprioceptive inputs from bilateral ankle joints could affect events onset and location of force application on sit-to-stand movement. On the other hand, though unilateral ankle joint vibration could not affect sensation of foot placement, it could modify the location of force application which shifted to the non-vibrated side on sit-to-stand. And we could apply the results on stroke patients to improve the use of affected-side lower limb.
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Lin, Shang-Huei, and 林尚輝. "Design and Evaluation of A Sit-to-Stand Assisted Device." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/16533735473117104163.
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碩士國立臺灣海洋大學
機械與機電工程學系
101
Due to aging population problems in Taiwan, the need to care elderly people is increasing significantly. Among the elderly patients, osteoarthritis and hemiplegic stroke are the majority in the lower limb osteoarthritis symptoms, especially in knee. However, for people with limited mobility, strength deficiency in quadriceps muscle is the primary reason of the disability. For sit to stand (STS) process, we developed a wearable STS assisted device which can provide the proper assisted to the old and people with STS disability. The goal of the research is to improve the pressure in the knee joint that resulted from muscle contraction. The design procedure is based on the behavior of muscle contraction during the cycles between STS stages. By investigating the cycles of STS, we can obtain the muscle force parameters associated with each stage, and contributing to the functional design of device. Users were tested with wearable assisted device in various experimental environments. In the meantime the Electromyography (EMG) was recorded for analysis. The experiment showed that wearing the STS assisted device may change the contraction conditions of rectus femoris and vastus medialis, and the force states of the knee. In the normal tests, it can be observed that the differences at four seat height (H = 50cm, 45cm, 40cm, 35cm) between wearing the assisted device or not. It shows that the energy patterns were transformed from concentrated type to distributed type. We can also learn from the tests of various speed of STS, the extent of assisted to users wearing the assisted device is affected by the STS speed. In the condition of 2 seconds, 3 seconds and 4 seconds of the STS time, the amount of muscle activity decreased from 45% to 55%; for 1 second and 5 seconds conditions, the decreased rate of muscle activity was not obvious. It is verified from the above experiments with muscle strength deficiency：The STS assisted device can improve problems of patients, not only for increasing the speed of STS but also relieving the force in knee.
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Chang, Chih-Sheng, and 張志昇. "Models of the Sit-to-Stand Movement for the Elderly." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/33170568844081112932.
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博士大同大學
設計科學研究所
99
The main contribution of this study is to examine, extend, and deepen the understanding of sit-to-stand (STS) movements in elderly people and then to establish an assessment method for the risks of falling. 28 elderly adults (M age = 70.1 years, SD = 4.1) and 36 young adults (M age = 19.6 years, SD = 0.8) with no known impairments or functional limitations were recruited for the study. During STS movement, the force platform system with two high-frequency vertical force platforms were used to measure the resultant ground reaction force (GRF), defined as the whole-body force, and its two components, the buttock and leg GRFs. To eliminate noise in the data from force platforms, the moving average method has been proposed. Three key points of the STS movement were confirmed as aspects of the GRF: the onset, maximum GRF, and seat-off. The onsets of the component GRFs identified the sequence of the important time points in the STS more precisely than the onset of the resultant GRF. Our data showed that the maximum whole-body GRF, the maximum GRF of both legs, and seat-off appeared in sequence and not simultaneously. Based on the characteristics indicated by the force data, the STS movement sequences were classified into three patterns: typical-modal pattern (smooth movement), multimodal pattern (unstable movement), and incompetent-modal pattern. Moreover, a quantification-based approach, impulse analysis, was introduced, with the goal of supplementing the Berg Balance Scale (BBS), which will thus provide a more precise analysis of STS movement in elderly people. Thus, elderly subjects who are expected to be at higher risk of injuries from falls can be provided with assistive devices and advice. Finally, these studies can provide information and suggestions for researchers, manufacturers, and rehabilitation professionals.
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Huang, Yu-Chi, and 黃育祺. "Kinematic analysis during sit-to-stand in individuals with Parkinson's disease." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/9k4v4m.
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碩士國立陽明大學
物理治療暨輔助科技學系
97
Background: Rising from a chair involves the transition from a stable seated position to a relatively unstable upright stance, and requires coordinated contractions of the muscles of the lower extremities and trunk. This task is particularly difficult for elderly individuals with musculoskeletal or neurological disorders, such as Parkinson’s disease (PD). Study of the sit-to-stand (STS) movement is often done with constraints on the use of the arm. However, arm position during the STS movement appears to influence the position of the body’s centre of mass (CoM). Restricting the arms leads to a different pattern of ankle angular displacement, with a much higher mean standard deviation than occurs with the arms free. Additionally, some of the factors may also affect the performance of the individuals with PD during STS task. Therefore it is essential for researchers to focus on the contributing factors that affect this population. Purposes: The primary purposes of the study were: (1) to compare the performance in subjects with PD during STS task with hand free or with hand folded on chest, (2) to investigate the contributing factors during STS task. Study design: Exploratory Research. Methods: This study had recruited twenty-four participants with idiopathic PD. During the STS task, we measured (1) the STS time; (2) EMG of the tibialis anterior, gastrocnemius medialis, rectus femoris, and long head of biceps femoris; (3) displacement of hip flexion, knee flexion, and ankle dorsiflexion; (4) average angular velocity of hip flexion, hip extension, and knee extension. According to previous study, we divided the STS time into three phases. Additionally, we measured the isometric muscle strength of hip extension and knee extension. Statistical analysis: Means and standard deviations would be calculated for this study. Paired samples t-test and would be employed at the α= .05 level to test for significant between two conditions. Multiple linear regression with stepwise selection model had been used to examine the contributing factors in STS task. The examined factors include (1) age; (2) displacement of hip flexion, knee flexion, and ankle dorsiflexion; (3) average angular velocity of hip flexion, hip extension, and knee extension; (4) isometric muscle strength of hip extension and knee extension. Results: The time of STS and the time of phase Ⅱ had significant difference between the hand free and hand folded conditions. But, when we modified the results to avoid the type Ⅰ error, there were no significant difference between these two conditions. The factors which had entered the regression model in hand free condition were the angular velocity of knee extension, hip flexion, hip extension, and the isometric muscle strength of hip extension. And in hand folded condition, only angular velocity of hip flexion and knee extension had entered the regression model. Discussion / Conclusion: It has show a tendency that the velocity of performing STS with hand folded on chest was faster than that with hand free in individuals with PD, especially for PD with falling. In our study, the angular velocity of hip flexion and knee extension are more prominent factors of all variables. We propose that STS task with hand folded on the chest can decrease the dependence of hip for subjects with PD.
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Tchonko, Hervé Patrick. "Control of sit-to-stand exoskeleton with human in the loop." 2014. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001647.
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M. Tech. Electrical engineering.Discusses the process of standing from a chair is the first movement to be affected by physical impairment or ageing. That justified the increase of researches around sit-to-stand movements nowadays.This thesis presents the design of a four links wearable device that can assist disable people to stand from a sitting position. The four links are joined at the ankle, the knee and the HAT (Head, Arm and Trunk) where actuators are mounted. The system is built around three controllers. The Goal Controller drives the links along their reference trajectories, the Stability Controller makes sure that the system does not collapse as it is rising, and the last controller combines the signal from the 2 first ones.The reference trajectories are obtained from data recorded from healthy people performing the movement. The main idea behind the present design is that from seat off, the floor projection of the body centre of pressure is evaluated and compared to the most stable position. The stability controller generates the torque necessary to compensate the deviation, while the third controller adjusts the level of participation of that torque to satisfy both the trajectory and the stability objectives. Similar idea was previously found in Prinz (2010).
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Huang, Jiun-jiun, and 黃俊鈞. "Assistive Device Design in Assisting the Sit-to-Stand (STS)Movement." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/69486220058652331240.
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碩士國立中山大學
機械與機電工程學系研究所
102
There are more and more countries facing the problem of aging population society, and the ratio of elder population keeps increasing recently. As a result, it’s necessary to pay more attention to the rights of elder people. The research focuses on issue “ Sit-to-Stand”, which is common problem to elder people. The research uses videotape analysis method to realize the action of standing up, and examines auxiliary strategy, which is used nowadays, by measuring ground reaction vertical forces and subjects'' perception. Then the research addresses the problem with old strategy and modifies it. Finally, the research proposes new auxiliary strategy, which is much safer when using newly designed Assistive device. Based on new auxiliary strategy, the research determines the designed goal after reviewing related patterns, and acquires solutions from two sub-goals, which are segmented from the designed goal. Then the research analyzes structural safety by using computer, and uses optimal method to derive actuator’s location. The research manufactures a test machine, and examines the theory of new auxiliary strategy by measuring users’ perception of usability.
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Domire, Zachary J. "A biomechanical analysis of maximum vertical jumps and sit to stand." 2004. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-538/index.html.
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Lu, Chang-Mao, and 呂長懋. "Innovative Design and Simulation of the Sit-to-Stand Assisted Device." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/71116198383560990851.
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碩士國立交通大學
機械工程學系
100
This study proposes a novel design of the Sit-to-Stand Assisted Device (StS device), easy to plug together with existed chair. The new designed product can help people whose legs are unavailable easy to stand from sitting posture. Based on the results of patent search and market analysis, two of the major specification of the product come up to be portable and high mechanical advantage. While working on the design of the StS device, some typical design theories are adopted. First of all, a measured data of human moving postures from sit to stand is prepared for synthesizing a assisting linkage for properly guiding the body raising to stand posture. Then, considering the common body weight, the gravity balance theory is applied to determine the feasible spring components on the linkage for saving the stand effort supported from the muscle on the legs. The tips of the combination of the StS device with some specified chair is introduced. The practical and useful demonstrated examples of the assisting operation of the developed device for a typical examiner are also simulated and presented.