Energetics of Human Leg-swing: Various Cost Models, Optimal Motions, and Fits to Experiments
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2010
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1291161175 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu12911611752021-08-03T06:01:01Z Energetics of Human Leg-swing: Various Cost Models, Optimal Motions, and Fits to Experiments Dong, Raymond Patrick Biomechanics Mechanical Engineering <p>The metabolic cost of leg-swing comprises (an estimated) 10% to 33% of the total cost of human walking and running. Experiments studying the swing phase of walking gait have been performed by numerous biomechanics researchers. One particular investigation by Doke, Kuo, et al. studied the cost of isolated leg-swing. Human subjects were asked to swing one leg forward and backward (in the sagittal plane) at a specified swinging amplitude and frequency. Metabolic rate was inferred by measuring maximal oxygen consumption during the leg-swinging task. </p><p>The goal of this thesis is to obtain a plausible functional form for the muscle metabolic cost that fits the Doke et al. experiments. Toward this end, we create a simple one-degree of freedom computer model of a leg, actuated by two uniarticular muscles. These muscles are modeled as having one of several functional forms for the cost, and these cost models relate the energetic expense of leg-swing to muscle torque, muscle shortening rate, etc.</p><p>Given one of the hypothesized forms of cost, optimization tools (in MATLAB) are used to find leg-swing strategies which minimize the objective function: total cost of leg-swing. The theoretical findings (from converged optimization results) are then compared with empirical data (from Doke et al.) to assess the validity of each cost model. </p><p>The optimization results show that three substantially different cost functions seem to fit the experiments by Doke et al., at least approximately. This suggests that the experimental data is not rich enough to distinguish these functional forms, and that we might need more extensive experimental data to obtain a reliable model of the metabolic cost.</p> 2010-12-17 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1291161175 http://rave.ohiolink.edu/etdc/view?acc_num=osu1291161175 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
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NDLTD |
| topic |
Biomechanics Mechanical Engineering |
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Biomechanics Mechanical Engineering Dong, Raymond Patrick Energetics of Human Leg-swing: Various Cost Models, Optimal Motions, and Fits to Experiments |
| author |
Dong, Raymond Patrick |
| author_facet |
Dong, Raymond Patrick |
| author_sort |
Dong, Raymond Patrick |
| title |
Energetics of Human Leg-swing: Various Cost Models, Optimal Motions, and Fits to Experiments |
| title_short |
Energetics of Human Leg-swing: Various Cost Models, Optimal Motions, and Fits to Experiments |
| title_full |
Energetics of Human Leg-swing: Various Cost Models, Optimal Motions, and Fits to Experiments |
| title_fullStr |
Energetics of Human Leg-swing: Various Cost Models, Optimal Motions, and Fits to Experiments |
| title_full_unstemmed |
Energetics of Human Leg-swing: Various Cost Models, Optimal Motions, and Fits to Experiments |
| title_sort |
energetics of human leg-swing: various cost models, optimal motions, and fits to experiments |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2010 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1291161175 |
| work_keys_str_mv |
AT dongraymondpatrick energeticsofhumanlegswingvariouscostmodelsoptimalmotionsandfitstoexperiments |
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1719429496752308224 |