Muscle activity and cardiovascular response during computer-mouse work with and without memory demands

Ergonomics
L FinsenH Christensen

Abstract

Computer-mouse work is characterized by repetitive movements combined with mental demands. The present purpose was to study how the body responded to simulated Computer Aided Design (CAD) work without memory demand and when a high short-term memory demand was introduced. Nine female subjects repetitively performed a task which involved 15 s of elevation of the right index and middle fingers followed by 6 s of rest. Every second time the fingers rested, the left index finger was required to type a six-figure number, either '123456' (without memory demand) or a random number shown half a minute before (with memory demand). After 7 min of performing the task without memory demand, the memory demand was introduced and continued for 1 h. Introduction of memory demand resulted in increased heart rate (77-->84 beats/min), blood pressure (systolic 129-->140 mmHg; diastolic 72-->79 mmHg) and forearm extensor muscle activity (wrist, 2.7-->4.5% EMGmax; finger, 5.6-->7.5% EMGmax) and finger flexor muscle activity (0.7-->1.2% EMGmax) indicating increased co-contraction. Hereafter, muscle activity and cardiovascular response tended to decrease. Self-reported stress and rating of perceived exertion (RPE) for the right shoulder increased throu...Continue Reading

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Citations

Aug 4, 2005·Experimental Brain Research·Jules G BloemsaatGerard P Van Galen
Oct 22, 2008·International Archives of Occupational and Environmental Health·Jesper KristiansenKaren Søgaard
Oct 12, 2001·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·L FinsenH Christensen
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Sep 15, 2020·Work : a Journal of Prevention, Assessment, and Rehabilitation·Denis A Coelho, Miguel L Lourenço

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