Dissertations / Theses on the topic 'Lifting techniques'
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McHugh, Gerard Paul 1967. "Advances in ducted propulsor analysis using vortex-lattice lifting-surface techniques." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10217.
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Delmar, Henry. "Lifting cervico-fronto-facial : approche anatomique ; etudes critiques de techniques chirurgicales ; discussion des indications." Aix-Marseille 2, 1991. http://www.theses.fr/1991AIX20714.
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Skelton, Ian R. "Innovation in construction techniques for tall buildings." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/19637.
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The skyline of many 'world cities' are defined and punctuated by tall buildings. The drivers for such dominant skylines range from land scarcity and social needs; high real estate values; commercial opportunity and corporate demand, through to metropolitan signposting. This fascination with tall buildings started with the patrician families who created the 11th Century skyline of San Gimignano by building seventy tower-houses (some up to 50m tall) as symbols of their wealth and power. This was most famously followed in the late 19th Century with the Manhattan skyline, then Dubai building the world's highest building, then China building some eighty tall buildings completed in the last 5 years, then UK building Europe's highest tower, the Shard and finally back to Dubai, planning a kilometre tall tower, potentially realising Ludwig Mies van der Rohe's 'Impossible Dream' of the 1920's and Frank Lloyd Wright's 1956 'Mile High Illinois'. This ambition to build higher and higher continues to challenge the Architects, Engineers and Builders of tall buildings and is expected to continue into the future. The tall building format is clearly here to stay.
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Muriti, Andrew John Safety Science Faculty of Science UNSW. "A biomechanical analysis of patient handling techniques and equipment in a remote setting." Awarded by:University of New South Wales. Safety Science, 2005. http://handle.unsw.edu.au/1959.4/22002.
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Remote area staff performing manual patient handling tasks in the absence of patient lifting hoists available in most health care settings are at an elevated risk of musculoskeletal injuries. The objective of this project was to identify the patient handling methods that have the lowest risk of injury. The patient handling task of lifting a patient from floor to a chair or wheelchair is a common task performed in a remote health care setting. The task was performed utilising three methods, these being: (1) heads/tails lift, (2) use of two Blue MEDesign?? slings and (3) use of a drawsheet. The task of the heads/tails lift was broken down into two distinctly separate subtasks: lifting from the (1) head and (2) tail ends of the patient load. These techniques were selected based on criteria including current practice, durability, portability, accessibility, ease of storage and cost to supply. Postural data were obtained using a Vicon 370 three - dimensional motion measurement and analysis system in the Biomechanics & Gait laboratory at the University of New South Wales. Forty reflective markers were placed on the subject to obtain the following joint angles: ankle, knee, hip, torso, shoulder, elbow, and wrist. The raw data were converted into the respective joint angles (Y, X, Z) for further analysis. The postural data was analysed using the University of Michigan???s Three-Dimensional Static Strength Prediction Program (3D SSPP) and the relative risk of injury was based on the following three values: (1) a threshold value of 3,400 N for compression force, (2) a threshold value of 500 N for shear force, and (3) population strength capability data. The effects on changes to the anthropometric data was estimated and analysed using the in-built anthropometric data contained within the 3D SSPP program for 6 separate lifter scenarios, these being male and female 5th, 50th and 95th percentiles. Changes to the patient load were estimated and analysed using the same computer software. Estimated compressive and shear forces were found to be lower with the drawsheet and tail component of the heads/tails lift in comparison to the use of the Blue MEDesign?? straps and head component of the heads/tails lift. The results obtained for the strength capability aspect of each of the lifts indicated a higher percentage of the population capable of both the drawsheet and tail end of the heads/tails lift. The relative risk of back injury for the lifters is distributed more evenly with the drawsheet lift as opposed to the heads/tails (tail) lift where risk is disproportionate with the heavier end being lifted. The use of lifter anthropometrics does not appear to be a realistic variable to base assumptions on which group of the population are capable of safely performing this task in a remote setting. This study advocates the use of the drawsheet lift in a remote setting based on the author???s experience and the biomechanical results obtained in this study. The drawsheet lift is both more accessible and provides a more acceptable risk when more than two patient handlers are involved, in comparison to the other lifts utilised lifting patients from floor to a chair.
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Oliveira, Lucas de. "Impacto da utilização de tecnicas de lifting explorando diferença entre ferramentas interpretada e compilada na velocidade computacional da codificação wavelet de imagens estaticas." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260073.
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Orientadores: Yuzo Iano, Ana Lucia Mendes Cruz Silvestre da SilvaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-08-14T10:02:55Z (GMT). No. of bitstreams: 1 Oliveira_Lucasde_M.pdf: 5052260 bytes, checksum: 34b1fa9e0e25d00990c118c6c93f964c (MD5) Previous issue date: 2009
Resumo: O campo de análise e compressão de imagens tem recebido especial atenção da comunidade científica recentemente por abranger os principais sistemas de TV digital, comunicações via satélite e comunicações móveis. Neste contexto, as Transformadas Wavelets Discretas (TWD) surgem como uma ferramenta poderosa e suas inúmeras vantagens permitiram sua inserção em importantes padrões tais como JPEG2000, MPEG4 e MPEG7. O método lifting realiza a TWD sub-amostrando o sinal antes do processo de filtragem, implicando em rápido processamento por fazer uso das similaridades entre filtros passa-alta e passa-baixa, acelerando o cálculo dos coeficientes. Na literatura, ganhos aritméticos teóricos de diferentes proporções foram obtidos sobre o método tradicional, destacando-se os trabalhos de Daubechies e Sweldens e de Reichel. O objetivo desta pesquisa consiste em estender esta discussão de resultados teóricos quando implementados através de ferramentas, interpretada e compilada, focando no tempo de processamento necessário para a realização (decomposição e reconstrução) de diferentes imagens estáticas empregando wavelets pertencentes às famílias de Daubechies, Symlets e Biortogonais. Medidas de PSNR foram utilizadas de forma a corroborar a perfeita implementação do lifting, dado que o mesmo não pode implicar em deterioração na imagem reconstruída.
Abstract: The field of analysis and compression of images has been received special attention of the scientific community because of including in the main systems of digital TV, satellite communications and mobile communications. In this context, the Discrete Transform Wavelet (TWD) arise how a powerful tool and its many advantages allowed your insertion in important standards such as JPEG2000, MPEG4 and MPEG7. The lifting method realizes the TWD sub-sampling the signal before the filtering, resulting in faster processing by using the similarities between high and low pass filters, speeding up the calculation of coefficients. In the literature, arithmetic theoretical gains of different proportions were obtained on the traditional method, especially the works of Daubechies and Sweldens and of Reichel. The objective of this research is to extend this discussion of theoretical results when implemented through tools, interpreted and compiled, targeting the processing time required to perform (decomposition and reconstruction) of different images using wavelets belonging to the families of Daubechies, and Symlets Biortogonais. Measures of PSNR were used to corroborate the perfect implementation of the lifting, since that cannot result in deterioration in the reconstructed image.
Mestrado
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
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Kjellberg, Katarina. "Work technique in lifting and patient transfer tasks /." Stockholm : Arbetslivsinstitutet, 2003. http://ebib.arbetslivsinstitutet.se/ah/2003/ah2003_12.pdf.
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Lady, Michael Andrew. "Towards an automated weight lifting coach: introducing LIFT." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1242.
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The fitness device market is young and rapidly growing. More people than ever before take count of how many steps they walk, how many calories they burn, their heart rate over time, and even their quality of sleep. New, and as of yet, unreleased fitness devices have promised the next evolution of functionality with exercise technique analysis. These next generation of fitness devices have wrist and armband style form factors, which may not be optimal for barbell exercises such as back squat, bench press, and overhead press where a sensor on one arm may not provide the most relevant data about a lift. Barbell path analysis is a well-known visual tool to help diagnose weightlifting technique deficiencies, but requires a camera pointed at the athlete that is integrated with motion-tracking software. This camera set up is not available at most gyms, so this motivates the use of a small, unobtrusive sensor to obtain data about an athlete's weightlifting technique. Researchers have shown that an accelerometer attached to a barbell while the athlete is lifting yields just as accurate acceleration information as a camera. The LIFT (Leveraging Information For Training) automated weight lifting coach attempts to implement a simple, unobtrusive system for analyzing and providing feedback on barbell weight lifting technique.
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Pascal, Jean-François. "Le lifting de la face interne de la cuisse : étude anatomique, expérimentale et proposition d'une technique originale." Lyon 1, 1989. http://www.theses.fr/1989LYO1M403.
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Desai, Sheena Dhiksha. "The effect of load and technique on biomechanical and perceptual responses during dynamic pushing and pulling." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1005187.
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Changes in the industrial job profile, from lifting and lowering to repetitive dynamic pushing and pulling have been facilitated through the use of manual vehicles, aimed at minimising the workload. Yet, the demands of pushing and pulling have not been well documented. Using measures of the horizontal component of the hand forces, spinal kinematics, muscle activity at various sites on the upper body and body discomfort ratings, this study aimed at quantifying the biomechanical and perceptual demands of various dynamic push/pull techniques. 36 healthy male participants performed two-handed forward pushing, two-handed backward pulling and one-handed forward pulling, employing an industrial pallet jack supporting two loads of 250kg or 500kg. While no single technique was definitively identified as preferable regarding hand forces, pushing at 500kg elicited higher initial and sustained forces (p<0.05) than one- and two-handed pulling respectively. Increments in load mass from 250kg to 500kg resulted in significant differences in the initial, sustained and ending forces. With regard to spinal kinematics in the sagittal plane, two-handed pulling elicited the highest trunk flexion, and may therefore expose individuals to prolonged forward bending. Generally this technique was found to evoke the highest sagittal responses. Spinal kinematic measures in the lateral and transverse planes suggested that one-handed pulling was accompanied by the highest measures, and hence the greatest risk of developing lower back disorders related to this plane. Although various combinations of muscles were active during each technique, one-handed pulling and pushing, most often induced the highest muscle activation levels and two-handed pulling, the lowest. While erector spinae evidenced no significant differences between techniques at each load or between loads for the same technique, activation levels were high under all conditions. Perceptual ratings of body discomfort revealed that not only is the upper body susceptible to injuries during pushing and pulling, but also that the lower extremities may have a considerable role to play in these tasks, with the calves being a particular area of concern. Findings concluded that symmetrical pushing and pulling tasks are preferable.
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Johnsson, Christina. "The patient transfer task : methods for assessing work technique /." Stockholm, 2005. http://diss.kib.ki.se/2005/91-7140-262-4/.
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Bennett, Anthea Iona. "The effect of load and technique on biomechanical and psychophysical responses to level dynamic pushing and pulling." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1005188.
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Pushing and pulling research has yet to fully elucidate the demands placed on manual workers despite established epidemiological links to musculoskeletal disorders. The current study therefore aimed to quantify biomechanical and perceptual responses of male operators to dynamic pushing and pulling tasks. Three common push/pull techniques (pushing, one handed and two handed pulling) were performed at loads of 250kg and 500kg using an industrial pallet jack in a laboratory environment. Thirty six healthy male subjects (age: 21 ±2 years, stature: 1791 ±43 mm and body mass: 77 ±10 kg) were required to perform six loaded experimental and two unloaded control conditions. Hand force exertion, muscle activity and gait pattern responses were collected during 10m push/pull trials on a coefficient controlled walkway; body discomfort was assessed on completion of the condition. Horizontal hand force responses were significantly (p<0.05) affected by load, with a linear relationship existing between the two. This relationship is determined by specific environmental and trolley factors and is context specific, depending on factors such as trolley maintenance and type of flooring. Hand force exertion responses were tenuously affected by technique at higher loads in the initial and sustained phases, with pushing inducing the greatest hand forces. Comparison of the motion phases revealed significant differences between all three phases, with the initial phase evidencing the greatest hand forces. Muscle activity responses demonstrated that unloaded backward walking evoked significantly higher muscle activation than did unloaded forward walking whilst increased muscular activity during load movement compared to unloaded walking was observed. However increasing load from 250kg to 500kg did not significantly impact the majority of muscle activity responses. When considering technique effects on muscle activity, of the significant differences found, all indicated that pushing imposed the least demand on the musculoskeletal system. Gait pattern responses were not significantly affected by load/technique combinations and were similar to those elicited during normal, unloaded walking. Perceptually, increased load led to increased perception of discomfort while pushing resulted in the least discomfort at both loads. From these psychophysical responses, the calves, shoulders and biceps were identified as areas of potential musculoskeletal injury, particularly during one and two handed pulling. Pushing elicited the highest hand forces and the lowest muscle activity responses in the majority of the conditions whilst psychophysical responses identified this technique as most satisfactory. Current results advocate the use of pushing when moving a load using a wheeled device. Suitability of one and two handed pulling remains contradictory, however results suggest that one handed pulling be employed at lower loads and two handed pulling at higher loads.
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Chong, Kok Hui. "Generation of efficient compilers by application of Single-Threading, Control Binding and Lambda-Lifting techniques." 1989. http://hdl.handle.net/2097/22467.
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Beaucage-Gauvreau, Erica. "Brace for it: assessing lumbar spinal loads for a braced arm-to-thigh lifting and bending technique using a musculoskeletal modelling approach." Thesis, 2019. http://hdl.handle.net/2440/120550.
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Manual material handling activities that involve forward bending and lifting have been identified as risk factors for the development of low back pain, due to the spinal loads and postures experienced during these tasks. Several activities of daily living, such as lifting light-to-moderate objects, gardening, and cleaning, require forward bending and lifting. Many of these tasks can be performed with one hand, therefore allowing for trunk support by placing the free hand on the ipsilateral thigh. This “braced arm-to-thigh technique” (BATT) could especially benefit individuals with low back pain (LBP). However, the BATT has not been evaluated biomechanically in this specific population, and has not been evaluated when applied to tasks other than lifting. The overall goal of this thesis was to evaluate the effect of a bracing force, applied by the hand on the ipsilateral thigh, on lumbar spine loading and trunk kinematics for symmetrical and asymmetrical bending and lifting tasks, using a newly developed and validated full-body musculoskeletal model with a detailed lumbar spine. In Study 1 (Chapter 4), an OpenSim full-body model was developed and validated by adapting an existing OpenSim jogging model to be suitable for lifting motions. Muscle activations predicted by the resulting Lifting Full-Body (LFB) model were directly compared to muscle activations measured with electromyography (EMG), during various lifting tasks. Good agreement, both with respect to pattern and timing, was observed for the back musculature. Comparison between model estimates of intradiscal pressures (IDP) and in vivo IDP measurements also showed strong agreement. The spinal loads estimated by the model matched the trends reported for vertebral body replacement (VBR) measurements in older individuals for similar lifting tasks. This study demonstrated that the LFB model is suitable to evaluate changes in lumbar loading during symmetrical and asymmetrical lifting. In Study 2 (Chapter 5), trunk kinematics and L4/L5 spine loading for the BATT were compared to those of three common unsupported two-handed and one-handed lifting techniques for two loading conditions (2 kg and 10 kg), in 20 healthy participants (30-70 years old) matched in age and gender to 18 participants. The thigh bracing force, measured by a load cell secured to the thigh with a custom apparatus, significantly reduced L4/L5 extension moments, compressive and antero-posterior (AP) shear forces, compared to unsupported lifting techniques. However, the BATT technique also increased asymmetrical L4/L5 moments and trunk angles. In Study 3 (Chapter 6), the BATT was adapted to three activities of daily living (ADLs) to understand the effect of thigh bracing on lumbar loading and spine kinematics in tasks other than lifting. These three tasks, namely weeding (gardening), reaching for objects in low cupboards, and car egress, were simulated in the laboratory, using custom apparatus, by ten healthy young males. The BATT reduced L4/L5 extension moments, compressive and AP shear forces compared to self-selected techniques. This thesis presents the first validated full-body OpenSim model suited to estimating lumbar spine loading in symmetrical and asymmetrical lifting tasks, with or without external loads. Using this LFB model, it was demonstrated that the BATT reduces lumbar extension moments, compression and AP shear forces for lifting tasks and other ADLs, compared to unsupported techniques, for healthy and LBP populations.Thesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2019
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CHEN, YU-HUA, and 陳郁樺. "Design and Implementation of a Novel Interleaved High Step-Up DC-DC Converter with Voltage-Lifting and Voltage-Stacking Techniques." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/s4ypcn.
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碩士崑山科技大學
電機工程研究所
106
A novel interleaved high step-up DC-DC converter is proposed in the thesis. The circuit configuration is based on an interleaved boost converter and introduces three-winding coupled inductors, lift capacitors, switched capacitors and diodes to consist voltage-lift cell and voltage-stack cell. The converter meets the requirements of high voltage gain and high power applications to become suitable for the power conversion of renewable energy power systems. The operating principle of the converter, guidelines of component design and selection, and design of driving circuit and closed-loop controller are presented in detail. The controller is designed to eliminate the effect of the variations of input voltage and output load on the output voltage such that the well output voltage regulation is achieved. The advantages of the proposed converter are as follows. The converter can achieve high voltage gain without extreme duty ratio operation. The voltage stresses on the power switches and diodes are greatly lower than the output voltage such that the low-voltage-rated MOSFETs with low on-resistances and low-voltage-rated schottky diodes with low forward voltage drop can be used to reduce the conduction losses. The switches achieve zero-current switching in the turn-on state to reduce switching losses. The parallel-input configuration can share the input current and is suitable for large input current applications. The input current ripple is reduced due to the interleaved PWM operation. The diode reverse-recovery problem can be alleviated by the leakage inductances of the coupled inductors. The leakage energy is recycled by the clamp circuit to improve efficiency and to suppress that the voltage spikes on the switches in the turn-off state. Finally, a 1000W prototype converter with 28 V input and 380 V output voltages is implemented and tested. The experimental result are provided to validate the effectiveness of the proposed converter. The maximum efficiency can be up to 98.07% at output power 100 W, and the efficiency at full load is 91.08%.
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Petruzzi, Brian James. "Stabilizing techniques for curved steel I-girders during construction." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-1364.
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There are many issues and challenges to deal with when designing a curved I-girder bridge. These challenges primarily deal with the many performance stages that curved I-girder bridges have such as the erection, construction, and in-service stages. When design engineers assess the stability of a bridge system, they typically evaluate the system in its final configuration with all cross frames attached and the hardened concrete deck placed. The evaluation of girder stability during erection and early stages of construction stages is difficult because of the limited presence of bracing in the system. Due to a lack of readily available analytical tools, many contractors do not conduct detailed analytical evaluations of the bridge behavior during early stages of the construction when stability is often critical. Instead, many contractors use rules of thumb and experience to ensure stability during erection. Erection and construction practices typically vary among contractors and consistent erection methods are a rarity. Although some rules of thumb may be quite conservative, others are much less so. Therefore, coming up with design guidelines based on parametric studies rather than rules of thumb are desirable to help allow the contractor and the designer to work together to prevent issues that may occur due to the lack of communication between the two professions.
Lastly, many challenges arise due to the complex geometry of curved I-girders. To prevent excessive rotation in erected girders, three points of vertical support are often provided. Two of these points usually consist of permanent supports in the form of bridge piers or abutments. The third point of support may consist of a temporary support in the form of a shore tower or holding crane. Cases where a holding crane may be satisfactory over a shore tower are also not well understood.
To improve the understanding of lifting practices and temporary support requirements, parametric studies were conducted using the finite element program ANSYS. Field data consisting of displacement, stress, and girder rotations gathered from two tests were used to validate both the linear and geometric non-linear three-dimensional FEA models. Upon validation, the finite element model was used to conduct linear and geometric non-linear analyses to determine critical factors in curved I-girder bridges during construction. Specifically, serviceability limit states were studied for the lifting of curved girders. For partially constructed states, parametric studies were conducted to determine optimal locations to place temporary supports as well as to investigate stability differences between using a shore tower and a holding crane. Recommendations are presented to provide guidance for the lifting of curved I-girders as well as to maximize stability of partially constructed bridges.text
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陳玉航. "Effect of hand lifting technique and stance condition on max hip moment during lifting tasks." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/82496274062327160272.
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碩士國立臺灣科技大學
工業管理系
92
In recent years, the low back injuries were the leading cause of occupational diseases and the cost associated with low back disorders have continued to rise annually. Among various administrative approaches to workplace intervention for low back pain, the prescription for training in ‘proper’ or ‘good’ lifting techniques is commonly encountered. The purpose for this study was to find out which lifting technique can lower the max hip moment during lifting tasks. Nine healthy males (means age 21.9 years, weight 69.1 kg and height 174.4 cm) participated in the study. We simulated the practical lifting task, the variables within experiment were set by follows: lifting weight (15 and 25 kg), stance conditions (parallel and straddle) and hand lifting technique (load first pulled toward body and load first pulled against body). 3D coordinates of spatial markers at each joints were obtained by Vicon motion analysis system. Subject was requested to lift on a AMTI two-force-platform system. The ground reaction forces were recorded for each foot in each plate throughout the lift. Results indicated effects of the task variables. Smaller load decreased the peak values of extension moment. And parallel lifting had less mean peak extension moment than straddle lifting. Furthermore, first pulling the load toward body had less mean peak extension moment than pulling the load against body. In general, to minimize the stresses on the hip and thus reduce the risk of low back injury, we recommend handlers to use a parallel-stance and keep the load close to the body throughout the lift.
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Freeman, Jacklyn Harrell. "Evaluating the effects of age on the variability in lifting technique." 2005. http://www.lib.ncsu.edu/theses/available/etd-05172005-180047/unrestricted/etd.pdf.
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SADLER, ERIN. "PRINCIPAL COMPONENT ANALYSES OF JOINT ANGLE CURVES TO EXAMINE LIFTING TECHNIQUE." Thesis, 2010. http://hdl.handle.net/1974/5976.
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The objectives of the present body of work were 1) to evaluate the Personal Lift-Assist Device (PLAD) in terms of its effect on lifting technique, interjoint coordination, and whether sex modulates these effects and 2) to explore the use of principal component analysis (PCA) as a method to investigate lifting waveforms. Thirty participants (15M, 15F) completed a freestyle, symmetrical lifting protocol during which three-dimensional kinematics of the ankle, knee, hip, and lumbar and thoracic spine were collected using a two-camera Optotrak 3020 system. There were four testing conditions: a) with and b) without wearing the PLAD; and c) 0% load and d) 10% of maximum back strength load. All data were evaluated using PCA. In the first analysis, the relationship between the PLAD and lifting technique under a loaded condition was explored. Results showed that 8 PCs were significantly different between the PLAD/No PLAD conditions yet there were no significant effects of sex on any of the PCs. It was concluded that wearing the PLAD encourages a lifting technique that is reflective of a squat lift, independent of sex. In the second analysis, the PLAD’s effect on interjoint coordination patterns under both loaded and unloaded conditions was examined using the relative phase angle (RPA). It was found that there were no significant differences between device, sex, or load conditions on any of the PCs retained in the model. A novel approach to enhance interpretability of PCs was developed during this study. Finally, when the PLAD was not worn, male and female differences were further investigated under loaded and unloaded conditions. It was determined that when the load is individualized to personal strength characteristics, sex differences in lifting technique are negligible. This is a contradictory finding from previous research. Overall, the major contributions of this research are: support for the use of the PLAD in industry; the recommendation that load be selected based on individual strength characteristics for lifting research experimental design; the use of PCA as a method to effectively evaluate lifting waveforms; and the development of a novel approach to aid in the interpretation of principal components.Thesis (Master, Kinesiology & Health Studies) -- Queen's University, 2010-08-18 09:35:19.142
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JIANG, BO-SHENG, and 蔣博勝. "KINEMATICS ANALYSIS OF THE SUCCESSFUL AND UNSUCCESSFUL JERK TECHNIQUE IN WEIGHT LIFTING." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/b4u8g2.
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碩士國立臺灣體育運動大學
競技運動學系碩士班
107
KINEMATICS ANALYSIS OF THE SUCCESSFUL AND UNSUCCESSFUL JERK TECHNIQUE IN WEIGHT LIFTING Abstratc Purpose: To compare the difference between successful and failed upward lifting actions in jerk. Methods: 9 male college weightlifting athletes of college open group were selected as research objects and 90% weight of the best personal results of each of the athletes were used for three times of trial lift. Two digital cameras were used to capture the performances of the thrust actions to select the successful and failed actions, and then a motion analysis system was used to carry out three-dimensional spatial image digitization processing to obtain a comparison between the kinematic data of barbell and body limbs. Results: From actuation to push-up action process, the maximum barbell vertical speed of successful trial lifts was significantly greater than that of failed trial lifts; the maximum barbell height and the bar racking height of successful trial lifts were significantly greater than those of failed trial lifts, while the barbell return distance and the vertical displacement of the body center of gravity in barbell return of successful trial lifts were significantly less than those of failed trial lifts; in the stage of separating legs to support, the foot back span distance of successful trial lifts was significantly less than that of failed trial lifts. Conclusions: The main cause of a failed trial upward lift is lack of maximum barbell vertical speed, which makes the barbell push-up height insufficient, forcing the trialist to extend the foot back span distance, resulting in the body center of gravity lowered and the barbell return distance increased, increasing the difficulty of completing the upward lift action.
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Sheppard, Phillip S. "Sex-Based Differences In Lifting Technique Under Increasing Load Conditions: A Principal Component Analysis." Thesis, 2012. http://hdl.handle.net/1974/7574.
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The objectives of the present study were: 1) to determine if there is a sex-based difference in lifting technique across increasing load conditions; and, 2) to examine the use of body size-adjusted tasks and back strength-adjusted loads in the analysis of lifting technique. Eleven male and 14 female participants (n=25) with no previous history of low back pain participated in the study. Participants completed freestyle, symmetric lifts of a box with handles from the floor to table height for five trials under three load conditions (10%, 20%, and 30% of their individual maximum isometric back strength). Joint kinematic data for the ankle, knee, hip, and lumbar and thoracic spine were collected using a two-camera Optotrak 3020 system (NDI, Waterloo, ON). Joint angles were calculated using a three-dimensional Euler rotation sequence and PCA was applied to assess differences in lifting technique across the entire waveform. A repeated measures ANOVA with a mixed design revealed no significant effect of sex for any of the PCs. This was contrary to previous research that used discrete points on the lifting curve to analyze sex-based differences but agreed with more recent research using more complex analysis techniques. There was a significant effect of load on lifting technique for six PCs of the lower limb (p<0.005). However, there was no significant difference in lifting technique for the thoracic and lumbar spine. It was concluded that, when load is standardized to individual back strength characteristics, males and females adopted a similar lifting technique. In addition, as load increases participants used more of a semi-squat or squat lifting technique.Thesis (Master, Kinesiology & Health Studies) -- Queen's University, 2012-10-03 21:10:11.889
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Desai, Sheena Dhiksha. "The effect of load and technique on biomechanical and perceptual responses during dynamic pushing and pulling /." 2008. http://eprints.ru.ac.za/1572/.
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Bennett, Anthena Iona. "The effect of load and technique on biomechanical and psychophysical responses to level dynamic pushing and pulling /." 2008. http://eprints.ru.ac.za/1580/.
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Lin, Han-Sheng, and 林漢森. "The Effect of 8 Weeks Training Applying High Lifting Leg Technique Mach Drills on Speed and Power of Junior High School Students." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/56413689457503271489.
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碩士長榮大學
運動休閒管理學系(所)
99
The effect of 8 weeks training applying high lifting leg technique Mach Drills on speed and power of junior high school students Abstract In this study, the characteristics of high lifting leg technique of Mach Drills were certified and grasped by the researching method of sports biomechanics. Then, high lifting leg technique was applied in one 8 weeks training focused on junior high school students. Furthermore, the effect of the training of high lifting leg technique on junior high school students’ speed and power performance could be comprehended. In experiment, 7 track and field athletes accepted training for many years were served as subjects (3 males and 4 females) in the analyzing of lower extremity parameters including joint angles and push off data. Afterward, 14 track and field athletes from Jincheng junior high school in Tainan City (including 7 males and 7 females) were recruited to accept the training of high lifting leg technique of Mach Drills for 8 weeks; meanwhile, pre-test and post-test of speed and power were executed and compared. The results showed: 1. Comparing with normal lifting leg technique of Mach Drills, high lifting leg technique let lifting leg to rise to the higher vertical height and to produce bigger pushing force. This result meant high lifting leg technique was beneficial to develop the lower extremity technique of running and fit with the requirement of junior high school athletes’ training. 2. The maximum loading rate of foot IV in high lifting leg technique of Mach Drills was bigger than the rate in normal lifting leg technique. It meant the amount of high lifting leg technique training should be took care to avoid the sports injury. 3. The training of high lifting leg technique of Mach Drills was helpful for the power of lower extremity and the speed of sprint, especially for the speed of sprint. 4. After the undergoing of high lifting leg technique training, the progressive scopes of testing performance between male and female athletes weren’t different significantly. So sex wouldn’t affect the advance ranges of male and female subjects. 5. More sports biomechanics and training studies aimed at high lifting leg technique of Mach Drills could be carried out in the future to understand and apply more relating this technique.