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Effects of arm support on shoulder and arm muscle activity during sedentary work
Department of Neuroscience, Karolinska Institute, Stockholm, Sweden.
Department of Physical Therapy, Karolinska Institute, Stockholm, Sweden.
Department of Orthopedics, Karolinska Hospital, Stockholm, Sweden.
Department of Neuroscience, Karolinska Institute, Stockholm, Sweden.
1997 (English)In: Ergonomics, ISSN 0014-0139, E-ISSN 1366-5847, Vol. 40, no 8, 834-848 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to evaluate different arm supports by comparing the activity of shoulder and arm muscles during various work tasks, with and without the lower arm supported. Twelve female subjects, aged between 23 and 37 years, were asked to perform three types of tasks: typing, simulated assembly work (in two different positions), and pipetting. The supports used were: fixed arm support (FIX), horizontal movable arm support (HOR), and spring-loaded arm support (SLA). During the experiments, the electromyograms (EMG) of four muscles were simultaneously recorded: m. deltoideus anterior and lateralis, m. trapezius pars descendens and m. extensor carpi radialis brevis. Normalization was made against maximum isometric contraction. The mean values of the normalized EMG levels showed a reduced EMG level of the shoulder muscles when using arm supports in all the tasks, and for all muscles but the wrist extensor, compared to the EMG levels without arm supports. The horizontal movable support was more effective in reducing the EMG levels of the shoulder muscles than other arm supports, in tasks at table height. Thus, it is possible to reduce muscle activity of the shoulder region by using arm supports. Further research is needed to make biomechanical calculations to compare the EMG level of these muscles using suspension and the effects of inclination of work task.

Place, publisher, year, edition, pages
London, United Kingdom: Taylor & Francis, 1997. Vol. 40, no 8, 834-848 p.
Keyword [en]
EMG, shoulder, arm, arm support
National Category
Medical and Health Sciences Psychology
Identifiers
URN: urn:nbn:se:oru:diva-55738DOI: 10.1080/001401397187829ISI: A1997XM91700006PubMedID: 9336107Scopus ID: 2-s2.0-0031214332OAI: oai:DiVA.org:oru-55738DiVA: diva2:1074486
Available from: 2017-02-15 Created: 2017-02-15 Last updated: 2017-10-18Bibliographically approved

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