Journal articles: 'Human Postural Analysis'

1

Xu, Kai, Huan Liu, Yuheng Du, and Xiangyang Zhu. "A Comparative Study for Postural Synergy Synthesis Using Linear and Nonlinear Methods." International Journal of Humanoid Robotics 13, no. 03 (August 23, 2016): 1650009. http://dx.doi.org/10.1142/s0219843616500092.

Full text

Abstract:

Human controls dozens of muscles for different hand postures in a coordinated manner. Such coordination is referred to as a postural synergy. Postural synergy has enabled an anthropomorphic robotic hand with many actuators to be applied as a prosthetic hand and controlled by two to three channels of biological signals. Principle component analysis (PCA) of the hand postures has become a popular way to extract the postural synergies. However, relatively big errors are often produced while the hand postures are reconstructed using these PCA-synthesized synergies due to the linearity nature of this method. This paper presents a comparative study in which the postural synergies are synthesized using both linear and nonlinear methods. Specifically, the Gaussian process latent variable model (GPLVM), as a nonlinear dimension reduction method, is implemented to produce nonlinear postural synergies and the hand postures can then be reconstructed from the two-dimensional synergy plane. Computational and experimental verifications show that the posture reconstruction errors are greatly reduced using this nonlinear method. The results suggest that the use of nonlinear postural synergies should be considered while applying a dexterous robotic hand as prosthesis. Versatile hand postures could be formed via only two channels of bio-signals.

APA, Harvard, Vancouver, ISO, and other styles

2

Loughlin, P., and M. Redfern. "Analysis and modeling of human postural control." IEEE Engineering in Medicine and Biology Magazine 22, no. 2 (March 2003): 18. http://dx.doi.org/10.1109/memb.2003.1195690.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Halim, Lisa Keizia, Yansen Theopilus, and Sugih Sudharma Tjandra. "Arduino-Based Development of Automatic Body Posture Measuring Device for Rapid Entire Body Assessment Method." International Journal of Engineering Technology and Natural Sciences 5, no. 2 (December 30, 2023): 112–22. http://dx.doi.org/10.46923/ijets.v5i2.221.

Full text

Abstract:

Workers from various industries can be exposed to musculoskeletal disorders (MSDs) risks in the workplace. Most cases of MSDs happen because of the accumulation of repetitive bad postures. Postural analysis can be done to implement changes that minimize MSDs risks in the workplace. The rapid entire body assessment (REBA) method provides an easy and fast measurement to analyze various postures. The accuracy of REBA assessments from observations is not good enough due to the limitations of human vision. The input of photo-based postural analysis also has a lot of error potential and takes up even more time. Therefore, this study aims to design a tool to do body posture measurements accurately and quickly. The Arduino-based postural analysis tool measures the position of several body segments, which are then used as the input of REBA in real time. The acceleration of each body segment recorded by the MPU6050 will be processed as displacement data and used to analyze the posture. The posture measurements detected by the tool is then used as input for REBA assessment. The device's accuracy was tested by comparing the photo-based postural analysis result to the postural analysis result of the tool. The reliability of the device was tested by Cronbach's Alpha method. The Cronbach's Alpha value of normal standing posture is 0.692, and the extreme posture's Cronbach's alpha value is 0.537. Multiple postures can be recorded at once using the tool. The tool can capture and assess multiple postures in approximately 6 minutes.

APA, Harvard, Vancouver, ISO, and other styles

4

Micheletti Cremasco, Margherita, Ambra Giustetto, Federica Caffaro, Andrea Colantoni, Eugenio Cavallo, and Stefano Grigolato. "Risk Assessment for Musculoskeletal Disorders in Forestry: A Comparison between RULA and REBA in the Manual Feeding of a Wood-Chipper." International Journal of Environmental Research and Public Health 16, no. 5 (March 5, 2019): 793. http://dx.doi.org/10.3390/ijerph16050793.

Full text

Abstract:

The analysis of the postural attitude of workers during the interaction with workstation’s elements and working environment is essential in the evaluation and prevention of biomechanical overload risk in workplaces. RULA (Rapid Upper Limb Assessment) and REBA (Rapid Entire Body Assessment) are the two easiest methods for postural risk assessment in the workplace. Few studies investigated postural risk in forestry sector with regard to human–machine interaction, in particular manually fed wood-chippers. The aim of this study was to evaluate the postures assumed by an operator during the manual feeding of a wood-chipper, and to compare RULA and REBA, in order to identify the more effective and appropriate method for the assessment of the risk of biomechanical postural overload. The results pointed out several postural issues of the upper limbs, and showed that RULA is a more precautionary method to protect operator’s health during the targeted tasks. Implications to improve the human–wood-chipper interaction are discussed.

APA, Harvard, Vancouver, ISO, and other styles

5

Bortolami, S. B., P. DiZio, E. Rabin, and J. R. Lackner. "Analysis of human postural responses to recoverable falls." Experimental Brain Research 151, no. 3 (August 1, 2003): 387–404. http://dx.doi.org/10.1007/s00221-003-1481-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Zhang, Xudong, and Don B. Chaffin. "Task Effects on Three-Dimensional Dynamic Postures during Seated Reaching Movements: An Analysis Method and Illustration." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 40, no. 13 (October 1996): 594–98. http://dx.doi.org/10.1177/154193129604001303.

Full text

Abstract:

This paper presents a new method to empirically investigate the effects of task factors on three-dimensional (3D) dynamic postures during seated reaching movements. The method relies on a statistical model in which the effects of hand location and those of various task factors on dynamic postures are distinguished. Two statistical procedures are incorporated: a regression description of the relationship between the time-varying hand location and postural profiles to compress the movement data, and a series of analyses of variance to test the hypothesized task effects using instantaneous postures with prescribed hand locations as dependent measures. The use of this method is illustrated by an experiment which examines two generic task factors: 1) hand movement direction, and 2) motion completion time. The results suggest that the hand motion direction is a significant task factor and should be included as an important attribute when describing or modeling instantaneous postures. It was also found that the time to complete a motion under a self-paced mode was significantly different from a motivated mode, but the time difference did not significantly affect instantaneous postures. The concept of an instantaneous posture and its usage in dynamic studies of movements are discussed. Some understanding of human postural control as well as the implications for developing a general dynamic posture prediction model also are presented.

APA, Harvard, Vancouver, ISO, and other styles

7

Roggio, Federico, and Giuseppe Musumeci. "The progression of human posture concept and advances in postural assessment techniques." Bullettin of the Gioenia Academy of Natural Sciences of Catania 56, no. 386 (December 23, 2023): FP616—FP638. http://dx.doi.org/10.35352/gioenia.v56i386.113.

Full text

Abstract:

This narrative review delves into the historical and evolutionary aspects of human bipedal upright posture, tracing its development from anthropological perspectives to modern postural analysis methods. It examines the multifaceted factors influencing the evolution of upright posture in human ancestors, challenging the notion of a singular cause. The review highlights various environmental and social hypotheses, such as the need for gathering food, self-defense, or tool use, which may have contributed to this significant evolutionary shift. The concept of posture has been interpreted differently across historical periods, reflecting the prevailing cultural and scientific understanding. From Aristotle’s view of upright posture as a divine gift to Johann Gottfried Herder’s perspective of it as a distinguishing human characteristic from animals, and to the more contemporary views of Henry and Florence Kendall, the evolution of the concept mirrors the changing paradigms in human thought. The development of methods for evaluating posture is also a key focus. The review traces the journey from the introduction of the plumb line in the 1850s, a simple yet effective tool for assessing spinal asymmetries, to the advent of the Adams test and the scoliometer, which revolutionized scoliosis diagnosis. Today, advanced techniques like rasterstereography and AI-based methods offer sophisticated, non-invasive means for detailed posture analysis, minimizing errors and maximizing efficiency. The review emphasizes the ongoing importance of posture in the context of overall health, underscoring the adage of a healthy mind in a healthy body. It illustrates how the study of posture, from its evolutionary roots to modern analytical tools, remains a vital aspect of understanding human health and well-being.

APA, Harvard, Vancouver, ISO, and other styles

8

Fransson, P. A., M. Magnusson, and R. Johansson. "Analysis of adaptation in anteroposterior dynamics of human postural control." Gait & Posture 7, no. 1 (January 1998): 64–74. http://dx.doi.org/10.1016/s0966-6362(97)00030-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Teresa Blázquez, M., Marta Anguiano, Fernando Arias de Saavedra, Antonio M. Lallena, and Pedro Carpena. "Characterizing the human postural control system using detrended fluctuation analysis." Journal of Computational and Applied Mathematics 233, no. 6 (January 2010): 1478–82. http://dx.doi.org/10.1016/j.cam.2008.04.038.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Watanabe, Yosaku, Kiyoko Yokoyama, and Kazuyuki Takata. "An analysis of human postural sway using differential information processing." Systems and Computers in Japan 19, no. 1 (January 1988): 98–104. http://dx.doi.org/10.1002/scj.4690190110.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

HOWARD, BRADLEY, and JINGZHOU YANG. "A NEW STABILITY CRITERION FOR HUMAN SEATED TASKS WITH GIVEN POSTURES." International Journal of Humanoid Robotics 09, no. 03 (September 2012): 1250015. http://dx.doi.org/10.1142/s0219843612500156.

Full text

Abstract:

In digital human modeling (DHM), the analysis of postural stability has five main goals: to determine if a posture is stable or unstable through an explicit criterion; to quantify the level of stability or provide a margin of stability that accounts for the height of the center of mass (COM) above the support plane(s); to be valid in the presence of externally applied forces and moments; be able to assess stability when multiple noncoplanar support planes exist, as is the case with seated postures; and to give insight into the support reaction force (SRF) distribution. To date, there is not a method for analyzing stability that can effectively meet each goal. This paper presents a new stability criterion and stability analysis that accomplishes each intended goal. The stability analysis is derived from the calculation of joint torque using the recursive Lagrangian dynamic formulation. A 56-degree-of-freedom (DOF) articulated digital human model is used to model seated postures to demonstrate the proposed stability criterion. Different given postures with different external load cases are presented.

APA, Harvard, Vancouver, ISO, and other styles

12

Md Hashim, Adila, and Siti Zawiah Md Dawal. "Comparison of Working Postures among Students in School Workshop: A CAD Environment Analysis." Advanced Engineering Forum 10 (December 2013): 199–206. http://dx.doi.org/10.4028/www.scientific.net/aef.10.199.

Full text

Abstract:

School furniture was known to be among main contributor of students back pain and bad postures. However, most studies focused only on the furniture in classroom compared to other facilities in school. Therefore, this study took the initiative to assess students working postures in school workshop. The objective of this study was to evaluate postural stress of students using RULA method in CATIA. Actual working process was recorded and tasks performed were translated into human model for ergonomic analysis. This evaluation was done in CAD environment via Human Activity Analysis. Result showed the male students have a higher average RULA score compared to the female students. This study discovered that the current workstation was unsuitable for both genders. Both genders have an average scores of more than 5, which indicated changes are required soon. This paper also presented a recommended design of a workstation to reduce musculoskeletal disorder (MSD) symptom and contribute to total back pain prevention for growing adolescents.

APA, Harvard, Vancouver, ISO, and other styles

13

Hayati, Abdollah, and Afshin Marzban. "Ergonomic problems in agricultural farms: Explainable relationship between awkward postures and body discomforts in Iranian leafy vegetable cultivation." Work 71, no. 3 (March 25, 2022): 709–17. http://dx.doi.org/10.3233/wor-210312.

Full text

Abstract:

BACKGROUND: Many agricultural activities excessively need human power and are associated with musculoskeletal disorders (MSDs). Leafy vegetable cultivation (LVC) is one of these. OBJECTIVE: The postural workload, body discomfort, and explainable linkage between these among Iranian wintry LVC workers were investigated. METHODS: Postures and body discomfort were evaluated using Ovako working posture analyzing system (OWAS) and a body map, respectively. The explainable body discomforts by working postures for each body region were descriptively discussed using some of the literature. RESULTS: Considering the maximum MSD risk value of 400%, irrigation and manual harvesting had the highest MSD risks with index risks of 313% and 305% respectively. Low back discomfort was the most common body discomfort in LVC which was reported for the operations of moldboard plowing, disking, manure application, chemical broadcasting, spraying, and manual harvesting. LVC operations seemed to rely heavily on the use of low back and shoulders. Bent and/or twist postures were the most common postures for the back. CONCLUSIONS: Almost all the body discomforts were explained by awkward postures shown by postural workload analysis. Therefore, the working posture analysis results may be reliable and utilized in future decisions around ergonomic interventions. Future studies may be conducted to investigate the simple and inexpensive ergonomic interventions to mitigate MSD risks.

APA, Harvard, Vancouver, ISO, and other styles

14

Ekemeyong Awong, Lisiane Esther, and Teresa Zielinska. "Comparative Analysis of the Clustering Quality in Self-Organizing Maps for Human Posture Classification." Sensors 23, no. 18 (September 15, 2023): 7925. http://dx.doi.org/10.3390/s23187925.

Full text

Abstract:

The objective of this article is to develop a methodology for selecting the appropriate number of clusters to group and identify human postures using neural networks with unsupervised self-organizing maps. Although unsupervised clustering algorithms have proven effective in recognizing human postures, many works are limited to testing which data are correctly or incorrectly recognized. They often neglect the task of selecting the appropriate number of groups (where the number of clusters corresponds to the number of output neurons, i.e., the number of postures) using clustering quality assessments. The use of quality scores to determine the number of clusters frees the expert to make subjective decisions about the number of postures, enabling the use of unsupervised learning. Due to high dimensionality and data variability, expert decisions (referred to as data labeling) can be difficult and time-consuming. In our case, there is no manual labeling step. We introduce a new clustering quality score: the discriminant score (DS). We describe the process of selecting the most suitable number of postures using human activity records captured by RGB-D cameras. Comparative studies on the usefulness of popular clustering quality scores—such as the silhouette coefficient, Dunn index, Calinski–Harabasz index, Davies–Bouldin index, and DS—for posture classification tasks are presented, along with graphical illustrations of the results produced by DS. The findings show that DS offers good quality in posture recognition, effectively following postural transitions and similarities.

APA, Harvard, Vancouver, ISO, and other styles

15

Peterka, R. J. "Sensorimotor Integration in Human Postural Control." Journal of Neurophysiology 88, no. 3 (September 1, 2002): 1097–118. http://dx.doi.org/10.1152/jn.2002.88.3.1097.

Full text

Abstract:

It is generally accepted that human bipedal upright stance is achieved by feedback mechanisms that generate an appropriate corrective torque based on body-sway motion detected primarily by visual, vestibular, and proprioceptive sensory systems. Because orientation information from the various senses is not always available (eyes closed) or accurate (compliant support surface), the postural control system must somehow adjust to maintain stance in a wide variety of environmental conditions. This is the sensorimotor integration problem that we investigated by evoking anterior-posterior (AP) body sway using pseudorandom rotation of the visual surround and/or support surface (amplitudes 0.5–8°) in both normal subjects and subjects with severe bilateral vestibular loss (VL). AP rotation of body center-of-mass (COM) was measured in response to six conditions offering different combinations of available sensory information. Stimulus-response data were analyzed using spectral analysis to compute transfer functions and coherence functions over a frequency range from 0.017 to 2.23 Hz. Stimulus-response data were quite linear for any given condition and amplitude. However, overall behavior in normal subjects was nonlinear because gain decreased and phase functions sometimes changed with increasing stimulus amplitude. “Sensory channel reweighting” could account for this nonlinear behavior with subjects showing increasing reliance on vestibular cues as stimulus amplitudes increased. VL subjects could not perform this reweighting, and their stimulus-response behavior remained quite linear. Transfer function curve fits based on a simple feedback control model provided estimates of postural stiffness, damping, and feedback time delay. There were only small changes in these parameters with increasing visual stimulus amplitude. However, stiffness increased as much as 60% with increasing support surface amplitude. To maintain postural stability and avoid resonant behavior, an increase in stiffness should be accompanied by a corresponding increase in damping. Increased damping was achieved primarily by decreasing the apparent time delay of feedback control rather than by changing the damping coefficient (i.e., corrective torque related to body-sway velocity). In normal subjects, stiffness and damping were highly correlated with body mass and moment of inertia, with stiffness always about 1/3 larger than necessary to resist the destabilizing torque due to gravity. The stiffness parameter in some VL subjects was larger compared with normal subjects, suggesting that they may use increased stiffness to help compensate for their loss. Overall results show that the simple act of standing quietly depends on a remarkably complex sensorimotor control system.

APA, Harvard, Vancouver, ISO, and other styles

16

Kramer, Ivanna, Sabine Bauer, and Anne Matejcek. "Automated Detection of Ear Tragus and C7 Spinous Process in a Single RGB Image—A Novel Effective Approach." BioMedInformatics 2, no. 2 (June 8, 2022): 318–31. http://dx.doi.org/10.3390/biomedinformatics2020020.

Full text

Abstract:

Biophotogrammetric methods for postural analysis have shown effectiveness in the clinical practice because they do not expose individuals to radiation. Furthermore, valid statements can be made about postural weaknesses. Usually, such measurements are collected via markers attached to the subject’s body, which can provide conclusions about the current posture. The craniovertebral angle (CVA) is one of the recognized measurements used for the analysis of human head–neck postures. This study presents a novel method to automate the detection of the landmarks that are required to determine the CVA in RGBs. Different image processing methods are applied together with a neuronal network Openpose to find significant landmarks in a photograph. A prominent key body point is the spinous process of the cervical vertebra C7, which is often visible on the skin. Another visual landmark needed for the calculation of the CVA is the ear tragus. The methods proposed for the automated detection of the C7 spinous process and ear tragus are described and evaluated using a custom dataset. The results indicate the reliability of the proposed detection approach, particularly head postures.

APA, Harvard, Vancouver, ISO, and other styles

17

Firmani, Flavio, and Edward J. Park. "A framework for the analysis and synthesis of 3D dynamic human gait." Robotica 30, no. 1 (May 17, 2011): 145–57. http://dx.doi.org/10.1017/s0263574711000440.

Full text

Abstract:

SUMMARYA comprehensive framework for the analysis and synthesis of 3D human gait is presented. The framework consists of a realistic morphological representation of the human body involving 40 degrees of freedom and 17 body segments. Through the analysis of human gait, the joint reaction forces/moments can be estimated and parameters associated with postural stability can be quantified. The synthesis of 3D human gait is a complicated problem due to the synchronisation of a large number of joint variables. Herein, the framework is employed to reconstruct a dynamically balanced gait cycle and develop sets of reference trajectories that can be used for either the assessment of human mobility or the control of mechanical ambulatory systems. The gait cycle is divided into eight postural configurations based on particular gait events. Gait kinematic data is used to provide natural human movements. The balance stability analysis is performed with various ground reference points. The proposed reconstruction of the gait cycle requires two optimisation steps that minimise the error distance between evaluated and desired gait and balance constraints. The first step (quasi-static motion) is used to approximate the postural configurations to a region close to the second optimisation step target while preserving the natural movements of human gait. The second step (dynamic motion) considers a normal speed gait cycle and is solved using the spacetime constraint method and a global optimisation algorithm. An experimental validation of the generated reference trajectories is carried out by comparing the paths followed by 19 optical markers of a motion tracking system with the paths of the corresponding node points on the model.

APA, Harvard, Vancouver, ISO, and other styles

18

Barbolyas, Boris, Michal Vajsábel, Cyril Belavý, Branislav Hučko, and Ladislav Dedík. "Postural Response Signal Characteristics Identified by Method of Developed Statokinesigram." Scientific Proceedings Faculty of Mechanical Engineering 23, no. 1 (December 1, 2015): 1–5. http://dx.doi.org/10.1515/stu-2015-0001.

Full text

Abstract:

Abstract Human postural system is taken as complex biological system with specific input and output time characteristics, in this study. Evaluation of measured output characteristics is useful in medical diagnostics or in describing postural system disorders. System theory principle provide suitable basis for postural signals analysis. Participating volunteers were instructed to maintain quiet upright stance posture on firm support surface of stabilometric platform for 60s. Postural system actuation was realized by vibration stimuli applied bilaterally on Achilles tendons for 20s. Postural reaction signal, its time profile and static and dynamic characteristics were evaluated by Method of Developed Statokinesigram Trajectory (MDST).

APA, Harvard, Vancouver, ISO, and other styles

19

Riley, Michael A., and Sean Clark. "Recurrence analysis of human postural sway during the sensory organization test." Neuroscience Letters 342, no. 1-2 (May 2003): 45–48. http://dx.doi.org/10.1016/s0304-3940(03)00229-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Kaupužs, Aivars, and Viesturs Lāriņš. "The Comparative Analysis of the Postural Stability Assessment Methods." SOCIETY, INTEGRATION, EDUCATION. Proceedings of the International Scientific Conference 3 (May 17, 2015): 547. http://dx.doi.org/10.17770/sie2015vol3.479.

Full text

Abstract:

The sense of balance is one of the most important functional capabilities that provide the postural position of the human body and the ability to move. Vestibular disorders are most commonly found in the elderly population, but this problem has not been adequately studied in children and teenagers. The digital force platforms and functional tests that can be carried out without the hardware are commonly used for postural balance assessment. The aim of the study is to compare EUROFIT balancing test and digital platforms BIOSWAY results. Eighty-three 11–14(M=12.5) year-olds primary schools pupils performed both balance tests. The research data reveals significant problems of postural stability, but results of both methods do not correlate (r=-0.14 to 0.2). The study results indicate the necessity to continue to develop and approve methods for early diagnosis of balance disorders in children that could be available and usable.

APA, Harvard, Vancouver, ISO, and other styles

21

Celik, Huseyin, Ugur Yilmaz, and Pinar Arpinar Avsar. "Rambling and trembling trajectories in the analysis of postural sway prior to the self-paced and reaction time tasks." Turkish Journal of Sports Medicine 58, no. 4 (July 7, 2023): 146–54. http://dx.doi.org/10.47447/tjsm.0750.

Full text

Abstract:

Objective: Previous studies suggested that center of pressure (COP) shifts occur before an expected perturbation in the form of early and anticipatory postural adjustments which operate in a short time scale. However, the effect of such perturbations on pre-existing postural set on a longer time scale remained uncovered. The purpose of this study was to investigate whether rambling and trembling components of the COP trajectories depend on postural task or phase of trial before a self-initiated perturbation. Materials and Methods: Twenty-four young healthy participants took part in the study. Subjects performed three postural tasks, namely, (i) quiet stance task: 60 seconds quiet stance, (ii) self-paced task: maximal vertical jump from quiet stance under the self-paced time condition, and (iii) reaction-time task: maximal vertical jump from quiet stance under the reaction-time condition. Postural sway features were examined in two phases, the first and last 20 seconds of the trials. Results: The features of rambling and trembling components of the COP trajectories were affected by postural task or phase of trial. The ellipse area of the COP and rambling trajectories were significantly different among postural tasks. The median frequency was significantly different between the phases of trials for the COP and rambling trajectories. Conclusion: This study indicated task-specific changes in postural sway features. Rambling and trembling trajectories, which would reflect two underlying human postural control mechanisms as maintaining the body's equilibrium with respect to a moving reference point and oscillating around the moving reference point respectively, were affected differently before a whole-body maximum-effort self-initiated perturbation.

APA, Harvard, Vancouver, ISO, and other styles

22

GHOMASHCHI, HAMED, ALI ESTEKI, ALI MOTIE NASRABADI, JULIEN CLINTON SPROTT, and FARID BAHRPEYMA. "DYNAMIC PATTERNS OF POSTURAL FLUCTUATIONS DURING QUIET STANDING: A RECURRENCE QUANTIFICATION APPROACH." International Journal of Bifurcation and Chaos 21, no. 04 (April 2011): 1163–72. http://dx.doi.org/10.1142/s021812741102891x.

Full text

Abstract:

When standing quietly, the human body is continuously moving about an upright posture in an erratic fashion. Conventional posturographic analyses that ignore structure of postural steadiness time series do not fully characterize properties of sway dynamics. Recurrence quantification analysis is a technique that can extract the dynamics of postural fluctuations through several variables. In this study, standing-still-sway dynamics of intact and deteriorated postural control systems were investigated by recurrence quantification of stabilograms. The results indicated that both normal and changed postural fluctuations time series, despite erratic and irregular appearance, contain a hidden structure. Although the two components of postural sway originated from an integrated control system, they exhibit distinct dynamical patterns. More determinism, greater local stability, higher degrees of nonstationarity and more laminar states were observed in fore-aft movements. Our findings reveal that decay of postural control mechanism affects dynamical properties of postural control system (especially along mediolateral direction because of the type of impairment). Determinism, nonstationarity and rigidity of balance program as well as laminar states characteristics were increased due to deterioration of postural control system. These findings imply that these measures not only can be used as the pathologic measures to discriminate between group differences, but also provide new openings to understand the nature of postural sway.

APA, Harvard, Vancouver, ISO, and other styles

23

Bari, Swapnil, Kashif Sherwani, and Neelesh Kumar. "Effect of Balance Training on Postural Analysis of Patients suffering from Balance Disorders: A Preliminary Report." Journal of Postgraduate Medicine, Education and Research 51, no. 4 (2017): 170–74. http://dx.doi.org/10.5005/jp-journals-10028-1258.

Full text

Abstract:

ABSTRACT Introduction Postural stability assessment is an important task that has found widespread medical and therapeutic applications. Typically, balance measurement systems are used for this purpose. The quantitative score of postural balance is very important in determining improvement of the patients suffering from balance disorder. Postural stability of humans is highly dependent on the position of centre of pressure of the body. The analysis of sway of a human body can be successfully done by studying oscillations of its centre of pressure. The distribution of foot pressure over different regions namely medial—lateral and anterior— posterior, governs the balance of the posture in both directions. Objective The aim of this study is to assess quantitative changes in the postural stability of patients suffering from balance disorders after providing them biofeedback based balance training. Materials and methods We used Force Sensing Resistors (FSRs) to sense the magnitude of forces acting at various points of both the feet. The centre of pressure is determined using the positions of various force points and magnitude of the force acting on them. The higher capability of the body to remain at that position implies higher postural stability and a lower power of sway. The force sensors produce signal proportional to the magnitude of the foot pressure. This signal after being collected by the Data Acquisition Board is fed to the system for calculating the centre of pressure and drawing a real time graph. Different algorithms are used to determine its mean position and compare the stability. The repeated analysis shows the amount of change in patient's postural behaviour, before and after the training. Results Until the publication of this research work, analysis of the data of 4 patients was performed. Post intervention trials resulted in higher scores of their postural performance. Hence, favourable results were obtained showing improvement in postural stability of the patients. Conclusion Wider variety of ataxia patients can be chosen to perform this assessment. The system is capable of determining a quantitative score of improvement of the postural stability and thus can be used to assess the postural performance of patients suffering from different postural disorders. How to cite this article Bari S, Saxena S, Sherwani K, Kumar N, Dhillon MS. Effect of Balance Training on Postural Analysis of Patients suffering from Balance Disorders: A Preliminary Report. J Postgrad Med Edu Res 2017;51(4):170-174.

APA, Harvard, Vancouver, ISO, and other styles

24

Shin, Sunhye, Chul Un Hong, Kyong Kim, and Tae Kyu Kwon. "Analysis of Physiological Signals of Individuals with Eyes Closed Subjected to Unexpected Direction-Specific Stimuli Causing Instability." Journal of Medical Imaging and Health Informatics 10, no. 11 (November 1, 2020): 2754–63. http://dx.doi.org/10.1166/jmihi.2020.3211.

Full text

Abstract:

Research regarding the cerebral cortex and muscle activity patterns of the body used for postural balance control when sudden instability stimuli occur is lacking. This study analyzed individuals' physiological signals when direction-specific instability stimuli were applied while their eyes were closed. Healthy adults in their 20s maintained their postural balance while looking at the center of gravity provided by a monitor with a three-dimensional dynamic postural balance training system. We performed electroencephalography (EEG) and measured trunk and lower extremity muscle activity of participants with their eyes closed when subjected to four direction-specific instability stimuli (anterior, posterior, left, and right). EEG results showed that gamma waves increased significantly with an unbalanced stimulus when the participant's eyes were open and closed. The increased gamma wave rate with eyes closed was low in the exercise planning area, where information is relatively integrated and exercise is planned without visual information. EMG results showed fewer gamma waves on EEG due to the low focus on postural control because participants could not observe the center of gravity, which is the basis for balance. The trunk and lower extremity muscles tended to be used more due to the larger body perturbation angle. These outcomes can be used as basic data regarding how the human brain and muscles maintain postural balance when an unexpected external instability stimulus occurs. Quantitative postural balance rehabilitation training protocols for the elderly and those with disabilities can be created based on these outcomes.

APA, Harvard, Vancouver, ISO, and other styles

25

Dijkstra, Bauke W., Esther M. J. Bekkers, Moran Gilat, Veerle de Rond, Robert M. Hardwick, and Alice Nieuwboer. "Functional neuroimaging of human postural control: A systematic review with meta-analysis." Neuroscience & Biobehavioral Reviews 115 (August 2020): 351–62. http://dx.doi.org/10.1016/j.neubiorev.2020.04.028.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Conceição, Laila B., Jussara A. O. Baggio, Suleimy C. Mazin, Dylan J. Edwards, and Taiza E. G. Santos. "Normative data for human postural vertical: A systematic review and meta-analysis." PLOS ONE 13, no. 9 (September 28, 2018): e0204122. http://dx.doi.org/10.1371/journal.pone.0204122.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Tay, Chuan Zhi, King Hann Lim, and Jonathan Then Sien Phang. "Markerless gait estimation and tracking for postural assessment." Multimedia Tools and Applications 81, no. 9 (February 21, 2022): 12777–94. http://dx.doi.org/10.1007/s11042-022-12026-8.

Full text

Abstract:

AbstractPostural assessment is crucial in the sports screening system to reduce the risk of severe injury. The capture of the athlete’s posture using computer vision attracts huge attention in the sports community due to its markerless motion capture and less interference in the physical training. In this paper, a novel markerless gait estimation and tracking algorithm is proposed to locate human key-points in spatial-temporal sequences for gait analysis. First, human pose estimation using OpenPose network to detect 14 core key-points from the human body. The ratio of body joints is normalized with neck-to-pelvis distance to obtain camera invariant key-points. These key-points are subsequently used to generate a spatial-temporal sequences and it is fed into Long-Short-Term-Memory network for gait recognition. An indexed person is tracked for quick local pose estimation and postural analysis. This proposed algorithm can automate the capture of human joints for postural assessment to analyze the human motion. The proposed system is implemented on Intel Up Squared Board and it can achieve up to 9 frames-per-second with 95% accuracy of gait recognition.

APA, Harvard, Vancouver, ISO, and other styles

28

Weiss, Erica J., and Martha Flanders. "Muscular and Postural Synergies of the Human Hand." Journal of Neurophysiology 92, no. 1 (July 2004): 523–35. http://dx.doi.org/10.1152/jn.01265.2003.

Full text

Abstract:

Because humans have limited ability to independently control the many joints of the hand, a wide variety of hand shapes can be characterized as a weighted combination of just two or three main patterns of covariation in joint rotations, or “postural synergies.” The present study sought to align muscle synergies with these main postural synergies and to describe the form of membership of motor units in these postural/muscle synergies. Seventeen joint angles and the electromyographic (EMG) activities of several hand muscles (both intrinsic and extrinsic muscles) were recorded while human subjects held the hand statically in 52 specific shapes (i.e., shaping the hand around 26 commonly grasped objects or forming the 26 letter shapes of a manual alphabet). Principal-components analysis revealed several patterns of muscle synergy, some of which represented either coactivation of all hand muscles, or reciprocal patterns of activity (above and below average levels) in the intrinsic index finger and thumb muscles or (to a lesser extent) in the extrinsic four-tendoned extensor and flexor muscles. Single- and multiunit activity was generally a multimodal function of whole hand shape. This implies that motor-unit activation does not align with a single synergy; instead, motor units participate in multiple muscle synergies. Thus it appears that the organization of the global pattern of hand muscle activation is highly distributed. This organization mirrors the highly fractured somatotopy of cortical hand representations and may provide an ideal substrate for motor learning and recovery from injury.

APA, Harvard, Vancouver, ISO, and other styles

29

Mun, Kyung-Ryoul, Sungkuk Chun, Junggi Hong, and Jinwook Kim. "The Relationship Between Foot Feature Parameters and Postural Stability in Healthy Subjects." Human Factors: The Journal of the Human Factors and Ergonomics Society 61, no. 7 (March 5, 2019): 1077–85. http://dx.doi.org/10.1177/0018720819828545.

Full text

Abstract:

Objective: Little has been explored about the disparate contribution of medial longitudinal arch (MLA) and lateral longitudinal arch (LLA) to human gait and postural stability. This study aims to investigate the correlation of foot feature parameters including both MLA and LLA with postural stability. Method: Thirteen young and healthy subjects participated in this study. The newly developed FFMS extracted foot feature parameters in nonweight-bearing (NWB) and weight-bearing (WB) conditions along with postural stability parameters in single-leg-standing (SLS) condition. A bivariate correlation analysis was carried out to investigate the correlation between the foot characteristics and the postural stability parameters. Results: The foot length and width showed negative correlation with center of pressure (CoP) distance in medio-lateral (ML) and total direction, whereas the foot length in NWB and WB conditions, and the foot width in WB condition showed positive correlation with CoP distance in anterior-posterior (AP) direction. The height of the LLA curve and the area of the MLA were correlated with the postural stability parameters in AP direction. The ratios of the LLA height and area showed moderate correlation with the CoP distance in ML direction and total direction. Conclusion: The size of a foot, such as the length and width, is correlated with postural stability. Whereas the MLA features are associated with postural stability in AP direction, the LLA features are associated with that in ML and total direction. Application: The findings suggest that the roles and contributions of the MLA and LLA features in and to the postural control are different.

APA, Harvard, Vancouver, ISO, and other styles

30

Egan, Sonja, Pieter A. J. Brama, Cathy Goulding, David McKeown, Clodagh M. Kearney, and Denise McGrath. "The Feasibility of Equine Field-Based Postural Sway Analysis Using a Single Inertial Sensor." Sensors 21, no. 4 (February 11, 2021): 1286. http://dx.doi.org/10.3390/s21041286.

Full text

Abstract:

(1) Background: Postural sway is frequently used to quantify human postural control, balance, injury, and neurological deficits. However, there is considerably less research investigating the value of the metric in horses. Much of the existing equine postural sway research uses force or pressure plates to examine the centre of pressure, inferring change at the centre of mass (COM). This study looks at the inverse, using an inertial measurement unit (IMU) on the withers to investigate change at the COM, exploring the potential of postural sway evaluation in the applied domain. (2) Methods: The lipopolysaccharide model was used to induce transient bilateral lameness in seven equines. Horses were monitored intermittently by a withers fixed IMU over seven days. (3) Results: There was a significant effect of time on total protein, carpal circumference, and white blood cell count in the horses, indicating the presence of, and recovery from, inflammation. There was a greater amplitude of displacement in the craniocaudal (CC) versus the mediolateral (ML) direction. A significant difference was observed in the amplitude of displacement in the ML direction between 4–12 h and 168 h. (4) Conclusions: The significant reduction in ML displacement during the acute inflammation period alongside greater overall CC displacement may be a compensatory behaviour for bilateral lameness.

APA, Harvard, Vancouver, ISO, and other styles

31

Rasoulivalajoozi, Mohsen, Mojtaba Rasouli, Carmela Cucuzzella, and Tsz Ho Kwok. "Prevalence of musculoskeletal disorders and postural analysis of beekeepers." International Journal of Industrial Ergonomics 98 (November 2023): 103504. http://dx.doi.org/10.1016/j.ergon.2023.103504.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Bridger, Robert S., Deborah Wilkinson, and Toni Van Houweninge. "Hip Joint Mobility and Spinal Angles in Standing and in Different Sitting Postures." Human Factors: The Journal of the Human Factors and Ergonomics Society 31, no. 2 (April 1989): 229–41. http://dx.doi.org/10.1177/001872088903100210.

Full text

Abstract:

The spinal angles of 25 female subjects were measured in standing and in four different sitting postures with various trunk-thigh angles. Additionally, measurements of hip and lumbar mobility were made in an attempt to relate mobility to spinal curvature in the different sitting postures. Lumbar curvature was observed to decrease as the trunk-thigh angle decreased across the different sitting postures, and reduction in curvature was associated with hip mobility. An exploratory analysis of interrelationships among hip mobility, spinal mobility, and spinal curvature was also carried out. A significant correlation between lumbar and thoracic angular deviations in standing and hip flexion/extension range was obtained. The findings are discussed with reference to theories of sitting posture and the influence of hip joint mobility on postural adaptations to furniture. Further investigations, including studies of male subjects, are indicated.

APA, Harvard, Vancouver, ISO, and other styles

33

Azemachi, Hiroya, Taro Oomae, Tsubasa Ito, Hideaki Nagano, Suguru Shiratori, and Kenjiro Shimano. "Analysis of gravity effect on human blood flow and skin temperature through postural change." E3S Web of Conferences 396 (2023): 01088. http://dx.doi.org/10.1051/e3sconf/202339601088.

Full text

Abstract:

The blood flow of human body has much impact on the thermo-physiological response. When person change the posture, the gravity acts changes its direction and thus the blood flow can be changed. It is hypothesized that the gravitational effects of postural changes affect blood flow and skin temperature, which in turn affect comfort. To verify this, in the present study, a subject experiment focusing on postural changes was conducted for two conditions (Case 1 and Case 2). In the Case 1 experiment, the subjects were asked to raise their hands for 10 minutes after 30 minutes of rest in the chair-sitting position. As a result, significant skin temperature change were observed in the upper arm, forearm, and hand. The largest skin temperature change was observed in the hands, which showed a decrease in skin temperature of approximately 1.2 °C. The change had influence on the whole-body average value. In Case 2, the subjects were placed in the supine position for 10 minutes after 30 minutes of rest in the chair position. As a result, a decrease in skin temperature of approximately 1 °C was observed on the hands and 0.5 °C in the foot was observed.

APA, Harvard, Vancouver, ISO, and other styles

34

Scinicariello, Anthony P., J. Timothy Inglis, and J. J. Collins. "The effects of stochastic monopolar galvanic vestibular stimulation on human postural sway." Journal of Vestibular Research 12, no. 2-3 (June 27, 2003): 77–85. http://dx.doi.org/10.3233/ves-2003-122-303.

Full text

Abstract:

Galvanic vestibular stimulation (GVS) is a technique in which small currents are delivered transcutaneously to the afferent nerve endings of the vestibular system through electrodes placed over the mastoid bones. The applied current alters the firing rates of the peripheral vestibular afferents, causing a shift in a standing subject's vestibular perception and a corresponding postural sway. Previously, we showed that in subjects who are facing forward, stochastic bipolar binaural GVS leads to coherent stochastic mediolateral postural sway. The goal of this pilot study was to extend that work and to test the hypothesis that in subjects who are facing forward, stochastic monopolar binaural GVS leads to coherent stochastic anteroposterior postural sway. Stochastic monopolar binaural GVS was applied to ten healthy young subjects. Twenty-four trials, each containing a different galvanic input stimulus from among eight different frequency ranges, were conducted on each subject. Postural sway was evaluated through analysis of the center-of-pressure (COP) displacements under each subject's feet. Spectral analysis was performed on the galvanic stimuli and the COP displacement time series to calculate the coherence spectra. Significant coherence was found between the galvanic input signal and the anteroposterior COP displacement in some of the trials (i.e., at least one) in nine of the ten subjects. In general, the coherence values were highest for the mid-range frequencies that were tested, and lowest for the low- and high-range frequencies. However, the coherence values we obtained were lower than those we previously reported for stochastic bipolar binaural GVS and mediolateral sway. These differences may be due to fundamental characteristics of the vestibular system such as lower sensitivity to symmetric changes in afferent firing dynamics, and/or differences between the biomechanics of anteroposterior and mediolateral sway.

APA, Harvard, Vancouver, ISO, and other styles

35

Yoong, Nicole Kah Mun, Jordan Perring, and Ralph Jasper Mobbs. "Commercial Postural Devices: A Review." Sensors 19, no. 23 (November 23, 2019): 5128. http://dx.doi.org/10.3390/s19235128.

Full text

Abstract:

Wearables are devices worn on the human body and are able to measure various health parameters, such as physical activity, energy expenditure and gait. With the advancement of technology, the general population are now spending more hours craning our necks and slouching over smartphones, tablets and computers, et cetera. Bodily posture is representative of physical and mental health. Poor posture can lead to spinal complications and the same can be said vice versa. As the standard of living increases, there is an increase in consumerism and the expectation to maintain such a lifestyle even in the aging population. Therefore, many are able to afford small luxuries in life, such as a piece of technology that could potentially improve their health in the long run. Wearable technology is a promising alternative to laboratory systems for movement and posture analysis. This article reviews commercial wearable devices with a focus on postural analysis. The clinical applicability of posture wearables, particularly in preventing, monitoring and treating spinal and musculoskeletal conditions, along with other purposes in healthcare, will be discussed.

APA, Harvard, Vancouver, ISO, and other styles

36

Qu, Xingda, Maury A. Nussbaum, and Michael L. Madigan. "Analysis of Human Postural Control during Spontaneous Sway Using an Optimal Control Model." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 50, no. 11 (October 2006): 1137–41. http://dx.doi.org/10.1177/154193120605001105.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Likens, Aaron D., Polemnia G. Amazeen, Stephen G. West, and Cameron T. Gibbons. "Statistical properties of Multiscale Regression Analysis: Simulation and application to human postural control." Physica A: Statistical Mechanics and its Applications 532 (October 2019): 121580. http://dx.doi.org/10.1016/j.physa.2019.121580.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Ramdani, Sofiane, Guillaume Tallon, Pierre Louis Bernard, and Hubert Blain. "Recurrence Quantification Analysis of Human Postural Fluctuations in Older Fallers and Non-fallers." Annals of Biomedical Engineering 41, no. 8 (March 28, 2013): 1713–25. http://dx.doi.org/10.1007/s10439-013-0790-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Muhsen, Laheeb, and Normah Maan. "Lie group analysis of retarded delay differential equations in human postural balance model." International Journal of Mathematical Analysis 9 (2015): 2303–18. http://dx.doi.org/10.12988/ijma.2015.58218.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Fransson, P. A., F. Tjernström, A. Hafström, M. Magnusson, and R. Johansson. "Analysis of short- and long-term effects of adaptation in human postural control." Biological Cybernetics 86, no. 5 (May 1, 2002): 355–65. http://dx.doi.org/10.1007/s00422-001-0305-y.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Ashtiani, Mohammed N., and Mahmood-Reza Azghani. "PREDICTIVE MODELS FOR ESTIMATION OF THE HUMAN STANCE EQUILIBRIUM PARAMETERS USING INVERSE DYNAMICS AND RESPONSE SURFACE METHOD." Journal of Musculoskeletal Research 20, no. 03 (September 2017): 1750016. http://dx.doi.org/10.1142/s0218957717500166.

Full text

Abstract:

Activation of the muscles and reaction forces of the joints rely on the body posture. The aim of the present paper is to investigate the relationship between the kinematics of static postures and muscle activation and joint forces by means of predictive regression models. To cover a reasonable number of postures and muscle recruitment patterns in forward inclinations, 4096 postures were analyzed. The response surface method was used to estimate the results of optimization-based inverse dynamics analysis. Two sorts of input variables (three angular positions of the lower limb joints and optimized muscular activation levels) and two model responses (muscle activation and joint force) were designed. The predictive models showed adequate goodness-of-fit in average ([Formula: see text]). The predictive models that applied on the feasible balanced postures revealed considerable reliance of the biomechanical efforts on the postural angles. The ankle force was majorly supported by activation of the calf muscles as [Formula: see text] (kN). The knee and the hip joint were dominantly influenced by the hamstring activation. Quantitative assessment of biomechanical parameters in the balanced standing postures may help researchers in finding standing information by knowing one type of experimental data such as the kinematic angles or the muscle electromyography.

APA, Harvard, Vancouver, ISO, and other styles

42

Wachholz, Felix, Tove Kockum, Thomas Haid, and Peter Federolf. "Changed Temporal Structure of Neuromuscular Control, Rather Than Changed Intersegment Coordination, Explains Altered Stabilographic Regularity after a Moderate Perturbation of the Postural Control System." Entropy 21, no. 6 (June 21, 2019): 614. http://dx.doi.org/10.3390/e21060614.

Full text

Abstract:

Sample entropy (SaEn) applied on center-of-pressure (COP) data provides a measure for the regularity of human postural control. Two mechanisms could contribute to altered COP regularity: first, an altered temporal structure (temporal regularity) of postural movements (H1); or second, altered coordination between segment movements (coordinative complexity; H2). The current study used rapid, voluntary head-shaking to perturb the postural control system, thus producing changes in COP regularity, to then assess the two hypotheses. Sixteen healthy participants (age 26.5 ± 3.5; seven females), whose postural movements were tracked via 39 reflective markers, performed trials in which they first stood quietly on a force plate for 30 s, then shook their head for 10 s, finally stood quietly for another 90 s. A principal component analysis (PCA) performed on the kinematic data extracted the main postural movement components. Temporal regularity was determined by calculating SaEn on the time series of these movement components. Coordinative complexity was determined by assessing the relative explained variance of the first five components. H1 was supported, but H2 was not. These results suggest that moderate perturbations of the postural control system produce altered temporal structures of the main postural movement components, but do not necessarily change the coordinative structure of intersegment movements.

APA, Harvard, Vancouver, ISO, and other styles

43

Silveira, Silvana Rocha. "Resposta do Controle Postural em Superfície Inclinada: uma Revisão de Literatura." Ensaios e Ciência: C. Biológicas, Agrárias e da Saúde 23, no. 1 (June 19, 2019): 61. http://dx.doi.org/10.17921/1415-6938.2019v23n1p61-66.

Full text

Abstract:

ResumoO controle postural é um requisito imprescindível para a execução das habilidades motoras durante as atividades de vida diária, logo, há a necessidade constante de ajuste dos segmentos corporais para garantir a autonomia e a independência da mobilidade humana. Os ajustes posturais são resultantes da interação do sistema sensório-motor e da sua correlação com o meio ambiente, produzindo orientação e estabilidade postural esperada durante a execução das atividades, sendo essa estática ou dinâmica. Deste modo, o objetivo do estudo foi apresentar os impactos funcionais ocorridos durante a posição de pé parada ou em movimento em superfície de inclinada, principalmente, entre os idosos. O estudo se fundamentou na revisão bibliográfica, no período temporal de 2006 a 2016, por meio da análise das bases de dados em Pubmed, Ebsco, SciELO, Medline e Lilacs, com a utilização dos termos: Plataforma de força, plano inclinado, plano horizontal e comportamento do centro de pressão. Os resultados apontaram que as situações rotineiras do dia a dia, realizadas em superfícies inclinadas, como um mero ato de subir ou até ficar parado em uma ladeira, pode ser um preditor ambiental para instabilidade postural, tornando-se necessário a reavaliação do olhar da intervenção terapêutica meramente clínica, passando a ampliar para as circunstâncias vinculadas com as questões da acessibilidade urbana. Palavras chaves: Plataforma de Força. Plano Horizontal. Comportamento do Centro de Pressão. Abstract Postural control is an essential requirement for the performance of motor skills during daily living activities, so there is a constant need to adjust body segments to guarantee the autonomy and independence of human mobility. Postural adjustments result from the interaction of the sensorimotor system and their correlation with the environment, producing orientation and postural stability expected during the execution of the activities, being static or dynamic. Thus, the objective of the study was to present the functional impacts occurred during standing or moving position on inclined surface, mainly among the elderly. The study was based on the bibliographic review, in the period from 2006 to 2016, through the analysis of databases in Pubmed, Ebsco, SciELO, Medline and Lilacs, using the terms Force platform, inclined plane, horizontal plane and pressure center behavior. The results showed that routine everyday situations on inclined surfaces, such as a mere act of climbing or even standing on a slope, may be an environmental predictor for postural instability, making it necessary to re-evaluate the clinical intervention, starting to extend the issues of urban accessibility to the related circumstances. Keywords: Force Platform. Horizontal Plane. Pressure Center Behavior.

APA, Harvard, Vancouver, ISO, and other styles

44

Chen, Yiyang, Jing Xian Li, and Lin Wang. "Influences of heel height on human postural stability and functional mobility between inexperienced and experienced high heel shoe wearers." PeerJ 8 (October 28, 2020): e10239. http://dx.doi.org/10.7717/peerj.10239.

Full text

Abstract:

Background High heel shoes (HHS) can affect human postural control because elevated heel height (HH) may result in plantar flexed foot and limit ankle joint range of motion during walking. Effects of HH and HHS wearing experience on postural stability during self-initiated and externally triggered perturbations are less examined in the literature. Hence, the objective of the present study is to investigate the influences of HH on human postural stability during dynamic perturbations, perceived stability, and functional mobility between inexperienced and experienced HHS wearers. Methods A total of 41 female participants were recruited (21 inexperienced HHS wearers and 20 experienced HHS wearers). Sensory organization test (SOT), motor control test (MCT), and limits of stability (LOS) were conducted to measure participant’s postural stability by using computerized dynamic posturography. Functional reach test and timed up and go test were performed to measure functional mobility. The participants’ self-perceived stability was assessed by visual analog scale. Four pairs of shoes with different HH (i.e., 0.8, 3.9, 7.0, and 10.1 cm) were applied to participants randomly. Repeated measures analysis of variance was conducted to detect the effects of HH and HHS wearing experience on each variable. Results During self-initiated perturbations, equilibrium score remarkably decreased when wearing 10.1 cm compared with flat shoes and 3.9 cm HHS. The contribution of vision to postural stability was larger in 10.1 cm HHS than in flat shoes. The use of ankle strategy worsened when HH increased to 7 cm. Similarly, the directional control of the center of gravity (COG) decreased for 7 cm HHS in LOS. Experienced wearers showed significantly higher percentage of ankle strategy and COG directional control than novices. Under externally triggered perturbations, postural stability was substantially decreased when HH reached 3.9 cm in MCT. No significant difference was found in experienced wearers compared with novices in MCT. Experienced wearers exhibited considerably better functional mobility and perceived stability with increased HH. Conclusions The use of HHS may worsen dynamic postural control and functional mobility when HH increases to 3.9 cm. Although experienced HHS wearers exhibit higher proportion of ankle strategy and COG directional control, the experience may not influence overall human postural control. Sensory organization ability, ankle strategy and COG directional control might provide useful information in developing a safety system and prevent HHS wearers from falling.

APA, Harvard, Vancouver, ISO, and other styles

45

Błażkiewicz, Michalina, Anna Hadamus, and Rafał Borkowski. "Recurrence Quantification Analysis as a Form of Postural Control Assessment: A Systematic Review." Applied Sciences 13, no. 9 (April 30, 2023): 5587. http://dx.doi.org/10.3390/app13095587.

Full text

Abstract:

Human postural control is commonly assessed by center of pressure (CoP) displacement analysis. However, traditional linear parameters do not provide a complete picture of postural control, so a number of nonlinear analyses have been introduced. One of these is recurrence quantification analysis (RQA), which is used to determine the number and duration of repeated states in a dynamic system. This review aimed to show how the RQA measures look in different groups of subjects when assessing postural stability during quiet standing and how the authors interpret them. Therefore, a systematic review was conducted of papers published from 2000 to February 2023. Searched databases were PubMed, ScienceDirect, and EBSCO. Twenty-eight publications were included in this review. The RQA parameters most commonly found in papers are %DET (determinism), ENT (Shannon entropy), %REC (recurrence), and %LAM (laminarity). %LAM is the most sensitive factor in determining differences in CoP position between different age groups, as it describes motion fluidity. The vision affects the deterministic structure of CoP motions. When the sensory organization test conditions became difficult, CoP variability increased, while the %DET decreased. It was concluded that traditional and nonlinear methods provide complementary and not redundant information for assessing age- and health-related changes in standing balance.

APA, Harvard, Vancouver, ISO, and other styles

46

Lavender, Steven A., Karen M. Conrad, Paul A. Reichelt, Fred T. Meyer, and Paul W. Johnson. "Postural analysis of paramedics simulating frequently performed strenuous work tasks." Applied Ergonomics 31, no. 1 (January 2000): 45–57. http://dx.doi.org/10.1016/s0003-6870(99)00027-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Baritz, Mihaela Ioana, and Laura Diana Cotoros. "Evaluation of Postural Stability Associated to Lifting/Lowering Motions." Applied Mechanics and Materials 555 (June 2014): 646–51. http://dx.doi.org/10.4028/www.scientific.net/amm.555.646.

Full text

Abstract:

A series of working situations involving lifting, transport and setting (lowering) motions represent the main dynamic biomechanical action of the human body and will be presented and analyzed in this paper. In these situations, the bipodal stability, as well as the manner of handling objects, the shape, weight and quality of these objects may determine some posture issues leading finally to occurrence, development and/or emphasis of muscular-skeletal system pathologies. Some aspects related to structural analysis, standard settings and other types of analysis performed upon lifting/lowering motion are presented in the first part of the paper. We presented in the second part of the paper the experimental system used for analyzing the lifting and handling some objects with weights between 1 10kg by analysis of postural stability and correlation with forces and moments developed by the human body during the action. The results of this analysis and also the conclusions upon the determinations of values for NIOSH equation (National Institute for Occupational Safety and Health) as a tool for stress evaluation associated with objects lifting/lowering motions using both hands are presented in the final part of the paper.

APA, Harvard, Vancouver, ISO, and other styles

48

Liu, Yuan, Bo Zeng, Ting Zhang, Li Jiang, Hong Liu, and Dong Ming. "Quantitative Investigation of Hand Grasp Functionality: Hand Joint Motion Correlation, Independence, and Grasping Behavior." Applied Bionics and Biomechanics 2021 (December 2, 2021): 1–14. http://dx.doi.org/10.1155/2021/2787832.

Full text

Abstract:

Modeling and understanding human grasp functionality are fundamental in prosthetics, robotics, medicine, and rehabilitation, since they contribute to exploring motor control mechanism, evaluating grasp function, and designing and controlling prosthetic hands or exoskeletons. However, there are still limitations in providing a comprehensive and quantitative understanding of hand grasp functionality. After simultaneously considering three significant and essential influence factors in daily grasping contained relative position, object shape, and size, this paper presents the tolerance grasping to provide a more comprehensive understanding of human grasp functionality. The results of joint angle distribution and variance explained by PCs supported that tolerance grasping can represent hand grasp functionality more comprehensively. Four synergies are found and account for 93 % ± 1.5 % of the overall variance. The ANOVA confirmed that there was no significant individual difference in the first four postural synergies. The common patterns of grasping behavior were found and characterized by the mean value of postural synergy across 10 subjects. The independence analysis demonstrates that the tolerance grasping results highly correlate with unstructured natural grasping and more accurately correspond to cortical representation size of finger movement. The potential for exploring the neuromuscular control mechanism of human grasping is discussed. The analysis of hand grasp characteristics that contained joint angle distribution, correlation, independence, and postural synergies, presented here, should be more representative to provide a more comprehensive understanding of hand grasp functionality.

APA, Harvard, Vancouver, ISO, and other styles

49

KEYSERLING, W. MONROE. "Postural analysis of the trunk and shoulders in simulated real time." Ergonomics 29, no. 4 (April 1986): 569–83. http://dx.doi.org/10.1080/00140138608968292.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Santos, Talysson M. O., Márcio F. S. Barroso, Rodrigo A. Ricco, Erivelton G. Nepomuceno, Érika L. F. C. Alvarenga, Álvaro C. O. Penoni, and Ana F. Santos. "A low-cost wireless system of inertial sensors to postural analysis during human movement." Measurement 148 (December 2019): 106933. http://dx.doi.org/10.1016/j.measurement.2019.106933.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Human Postural Analysis'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles