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The effect of wrist orthoses on forearm muscle activity
KTH, Superseded Departments, Industrial Economics and Management.
2004 (English)In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 35, no 2, 129-136 p.Article in journal (Refereed) Published
Abstract [en]

A general hypothesis is that a wrist orthosis reduces the wrist extensor muscle load. The aim of this study was to investigate the effects of a completely stiff wrist orthosis (SO) and a commercially available wrist orthosis (CO) on flexor and extensor electromyographic (EMG)-activity in a standardised intermittent gripping task and during standardised manual work tasks. Surface EMG from two forearm flexor and two extensor muscles was recorded. The target grip forces were 5%, 20% and 40% of maximal voluntary contraction (MVC). During the grip contraction phase CO had no effect on the ENIG-readings. SO resulted in higher EMG activity than when gripping with CO and with no orthosis (NO), especially when gripping with 40% MVC. During the relaxation phase neither CO nor SO had any effect on the extensors. For the flexors the SO gave higher ENIG-readings than when gripping with CO and NO, especially at 40% MVC. In conclusion the wrist orthoses tested did not reduce the EMG-activity from the flexors or the extensors during gripping or manual tasks.

Place, publisher, year, edition, pages
2004. Vol. 35, no 2, 129-136 p.
Keyword [en]
manual work, wrist orthosis, forearm muscle activity
National Category
Medical and Health Sciences
URN: urn:nbn:se:kth:diva-45358DOI: 10.1016/j.apergo.2003.11.004ISI: 000221364100007PubMedID: 15105074ScopusID: 2-s2.0-1942507507OAI: diva2:453065
QC 20111101Available from: 2011-11-01 Created: 2011-10-28 Last updated: 2011-11-01Bibliographically approved

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