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The Influence of Strength and Mobility on Lumbar Biomechanics during Lifting.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The Influence of Strength and Mobility on Lumbar Biomechanics during Lifting./
作者:	Patterson, Christopher S.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	72 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-03, Section: B.
Contained By:	Dissertations Abstracts International83-03B.
標題:	Biomechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28319287
ISBN:	9798535591230

The Influence of Strength and Mobility on Lumbar Biomechanics during Lifting.
Patterson, Christopher S.

The Influence of Strength and Mobility on Lumbar Biomechanics during Lifting. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 72 p.

Source: Dissertations Abstracts International, Volume: 83-03, Section: B.

Thesis (Ph.D.)--Loma Linda University, 2021.

This item must not be sold to any third party vendors.

Weakness of the lumbar and hip extensors muscles as well as limited hip flexion mobility have been proposed to contribute to greater lumbar spine loading and greater lumbar flexion during functional tasks. The purpose of the current study was to examine the associations among hip and lumbar spine extension strength, hip flexion mobility and lumbar spine biomechanics during a squat lifting task. Fifty healthy adults participated in the study. Strength of the lumbar extensors and hip extensors was measured using a motor driven dynamometer. Hip range of motion was assessed using a 3D motion capture system. Participants lifted boxes of various weights utilizing a squat lifting technique. Peak lumbar spine and hip flexion were quantified during the final 10% of the descent phase of the squat lifting task. Lumbar spine moments and lumbar paraspinal muscle activity (as measured by electromyography) were quantified during the concentric phase of the squat lifting task. There was a significant positive association between lumbar extensor strength and average lumbar extensor moment during lifting (r=0.50, p<0.01). Similarly, hip extensor strength was positively associated with the average lumbar extension moment (r=0.38, p <0.05). Hip extensor strength was negatively associated with activation of the lumbar paraspinal muscles during lifting (r=-0.38, p<0.05). There was a significant negative association between hip flexion capacity and peak lumbar spine flexion during squat lifting (r=-0.48, p<.001). Similarly, peak lumbar spine flexion was negatively associated with lumbar paraspinal strength (r=-0.38, p<.01). During the squat lift task, peak hip motion was positively associated with hip flexion capacity (r=0.79, p<.001). Stronger individuals are more likely to use their hip extensors and lumbar spine extensors to lift. In contrast, those with lower strength employ subtle biomechanical changes to reduce lumbar spine loading. Diminished hip flexion capacity and lumbar extension strength resulted in greater amounts of lumbar flexion during a squat lifting task. Individuals with greater hip flexion capability utilize less lumbar flexion and greater hip flexion to complete the task. In contrast, those with diminished hip flexion capability and lower lumbar extension strength utilize greater amounts of lumbar flexion.

ISBN: 9798535591230Subjects--Topical Terms:

548685
Biomechanics.
Subjects--Index Terms:

Hip extensor strength

The Influence of Strength and Mobility on Lumbar Biomechanics during Lifting.
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