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Aging and mechanical determinants of...

Ortega, Justus D.

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Aging and mechanical determinants of walking energetics.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Aging and mechanical determinants of walking energetics./
作者:	Ortega, Justus D.
面頁冊數:	133 p.
附註:	Adviser: Claire T. Farley.
Contained By:	Dissertation Abstracts International67-10B.
標題:	Biology, Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3239399
ISBN:	9780542942204

Aging and mechanical determinants of walking energetics.
Ortega, Justus D.

Aging and mechanical determinants of walking energetics. - 133 p.

Adviser: Claire T. Farley.

Thesis (Ph.D.)--University of Colorado at Boulder, 2006.

This dissertation investigates the mechanical determinants of the metabolic cost of walking with emphasis on understanding the basis for the 15-20% greater metabolic cost of walking in elderly adults than in young adults.

ISBN: 9780542942204Subjects--Topical Terms:

1017816
Biology, Physiology.

Aging and mechanical determinants of walking energetics.
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245 1 0 $a Aging and mechanical determinants of walking energetics.
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500 $a Adviser: Claire T. Farley.
500 $a Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5598.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2006.
520 $a This dissertation investigates the mechanical determinants of the metabolic cost of walking with emphasis on understanding the basis for the 15-20% greater metabolic cost of walking in elderly adults than in young adults.
520 $a My first goal was to examine the fundamental relationship between the vertical movement of the body and the metabolic energy consumed during walking in order to understand whether vertical body movement may play a role in the higher metabolic cost of walking in elderly adults. To determine the relationship between vertical center of mass movement and the metabolic cost of walking, young adults walk with minimal vertical body movement and normal body movement over a range of speeds (0.7-1.8 m s-1). Contrary to classical ideas in biomechanics, when vertical center of mass movement was reduced by 69%, subjects consumed nearly twice as much metabolic energy for walking, regardless of speed (p = 0.0001).
520 $a My second goal was to determine whether elderly adults consume more metabolic energy for walking than young adults due to high metabolic costs of performing mechanical work or stabilizing the body. First, I tested the hypothesis that elderly adults perform more individual limb work than young adults during walking. Over a range of speeds (0.7-1.8 m s-1), elderly adults had a 20% higher net metabolic cost (p = 0.010) but performed 10% less individual limb work than young adults (p = 0.028). To determine if elderly adults perform mechanical work during walking less efficiently than young adults, I quantified delta efficiency during walking (1.3 m s-1) on five uphill slopes. Elderly adults performed mechanical work during walking with a lesser delta efficiency (29%) than young adults (33%) (p = 0.006). To determine if elderly adults have a greater metabolic cost of stabilization, I measured metabolic cost while applying external stabilization to young and elderly adults during walking (1.3 m s-1). External stabilization reduced metabolic cost similarly in elderly and young adults walking normally (3-4%) and walking with no arm swing (6-7%).
520 $a These finding show that elderly adults perform less mechanical work but at a lower efficiency than young adults. Consequently, the metabolic cost of performing work of walking is similar for both age groups. Moreover, elderly adults have a similar cost of stabilization during walking as young adults. These studies indicate that other factors, such as the cost of generating muscular force may be responsible for the greater metabolic cost of walking in elderly adults.
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