Motor unit activity during stereotyped finger tasks and computer mouse work

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
K SøgaardH Christensen

Abstract

Motor unit (MU) activity pattern was examined in the right-hand extensor digitorum communis muscle (EDC) during standardised finger movements simulating actual computer mouse tasks. Intramuscular recordings were performed with a quadripolar needle electrode. Nine women performed four lifts of their right-hand index finger, middle finger or both as well as a number of double clicks. Additionally, the subjects performed contra lateral activity with their left-hand fingers and for three subjects recordings were also obtained during an interview with no physical activity. Besides the expected close coupling of MU activity with finger movement, activity was observed in three different situations with no physical requirements. Attention related activity was found before or after performance of the finger movement task, contra lateral activity in right EDC during left-hand finger tasks, and activity during mental activity without any finger movements involved. A relatively large number of doublet occurrences suggest they are a natural part of the activation pattern during performance of the rapid finger movement required to perform an efficient double click on the computer mouse.

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Citations

Aug 30, 2008·European Biophysics Journal : EBJ·Bjørn Gilbert Nielsen
Feb 17, 2005·European Journal of Applied Physiology·Stefan ThornSusan Hallbeck
Nov 16, 2007·European Journal of Applied Physiology·Cecilie RøeStein Knardahl
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Jan 21, 2010·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Jennifer L Stephenson, Katrina S Maluf
Sep 24, 2014·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Gisela Sjøgaard, Karen Søgaard
Jul 14, 2010·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Pernille VedstedGisela Sjøgaard
Sep 18, 2009·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Didier StaudenmannJaap H van Dieën
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