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The dynamic response of the human spine to lateral bend perturbations: effects of pre-load and step input magnitude

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Title: The dynamic response of the human spine to lateral bend perturbations: effects of pre-load and step input magnitude
Author: Chiang, James K.
Department: Department of Human Biology and Nutritional Sciences
Advisor: Potvin, James R.
Abstract: Thirteen males experienced lateral bend, step input magnitudes of 20% and 30% of their maximum lateral bend moment (M$\sb{\rm MLB})$ while sustaining isometric pre-loads equivalent to 5% and 15% M$\sb{\rm MLB}.$ The dependent variables were peak trunk angle, pre and peak moment, trial duration, rate of loading, and pre and peak EMG from 5 trunk muscles bilaterally. Peak trunk angle was dependent on the magnitude of both the pre- and added load. Rate of loading and trial duration were dependent on the added load only. In general, for both the agonists and antagonists muscles, the response was larger in magnitude to the 5+30% condition than to the 15+20% condition, despite the common 35% M$\sb{\rm MLB}$ cumulative load. It is proposed the spine was less stable with the 5% pre-load, necessitating a larger muscle response to the added load in an effort to regain stability.
URI: https://hdl.handle.net/10214/20320
Date: 1997
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