Effect of fatigue on the precision of a whole-body pointing task

Neuroscience
M SchmidT Pozzo

Abstract

We addressed the issue of the possible degradation of the aiming precision of a whole-body pointing task, when movement coordination is deranged by selective fatigue of the postural task component. The protocol involved continuous repetition (0.1 Hz frequency) of rapid whole-body pointing trials toward a target located beyond arm length, starting from stance and requiring knee flexion. Six healthy human subjects repeated the trials until exhaustion. Such repetition led to electromyography signs of fatigue in rectus femoris (active in body lowering and raising), but not in deltoid (prime mover for arm reaching component). Rectus femoris fatigue affected the equilibrium control strategy, since the anteroposterior displacement of the center of foot pressure was reduced during the fatigued compared with the initial trials. Conversely, the precision of the aiming movement was unaffected by the rectus femoris fatigue in spite of changes in finger trajectory. Trunk inclination at the end of whole-body pointing task and hip and shoulder marker trajectories were unaffected by rectus femoris fatigue. Control experiments were made, whereby fatiguing repetitions of the postural component of the task were performed without finger pointing, ...Continue Reading

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Nov 2, 2007·Experimental Brain Research·Salim Nana-IbrahimMaurice Zattara
May 1, 2010·Journal of Sports Sciences·Jiu-Jenq LinTung-Wu Lu
Aug 30, 2008·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Neeta KanekarAlexander S Aruin
Jan 28, 2010·Archives of Physical Medicine and Rehabilitation·Jasmine C KwokWilliam W Tsang
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May 10, 2018·The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences·Matthieu CasteranElizabeth Thomas

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