A study of forearm muscle activity and wrist kinematics in symptomatic office workers performing mouse-clicking tasks with different precision and speed demands

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
Grace P Szeto, Joseph K M Lin

Abstract

The present study examined various biomechanical parameters in symptomatic and asymptomatic computer users during mouse-clicking tasks with different speed and precision demands. Surface electromyography (EMG) of right wrist flexors and extensors were compared between individuals with computer-related wrist/hand symptoms (n=9) and pain-free controls (n=8). Each subject performed four mouse tasks with high and low precision, constant and fastest speed of 5 min each. Results showed that Case subjects recorded significantly lower EMG amplitudes during maximum voluntary contractions in three out of four forearm muscles (p=0.001-0.019). Normalised median amplitudes of extensor carpi radialis and flexor carpi ulnaris showed significant differences between groups in the speed conditions (p=0.01, 0.04, respectively). Case subjects reported significant discomforts in the wrist/hand region in all tasks, while recorded significantly longer response time and fewer mouse clicks compared to controls. Results suggested that forearm muscles in symptomatic individuals were inhibited in their maximal activation as well as during functional tasks, and this may imply altered motor control mechanisms in forearm muscles contributing to work-related ...Continue Reading

References

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Citations

Oct 31, 2012·European Journal of Applied Physiology·Guilherme H ElcadiAlbert G Crenshaw
Aug 19, 2015·Gait & Posture·Flávia Pessoni F M RicciMarisa de Cássia Registro Fonseca
Apr 8, 2016·International Journal of Occupational Safety and Ergonomics : JOSE·Hilma Raimona ZadryZahari Taha
Jul 19, 2014·International Journal of Occupational Medicine and Environmental Health·Shunji SakoRyoichi Inaba
Jul 30, 2016·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Pascal MadeleineAfshin Samani
Jul 4, 2016·Work : a Journal of Prevention, Assessment, and Rehabilitation·Mohd Firdaus Mohd TaibMyung Hwan Yun
Dec 23, 2016·International Journal of Occupational Safety and Ergonomics : JOSE·Shunji SakoRyoichi Inaba
Feb 9, 2017·Canadian Journal of Physiology and Pharmacology·Howard J GreenA Russell Tupling
Jun 25, 2020·International Journal of Occupational Safety and Ergonomics : JOSE·Roman-Liu Danuta, Tomasz Tokarski

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