Effects of electromyographic and mechanomyographic biofeedback on upper trapezius muscle activity during standardized computer work

Pascal Madeleine, Pernille Vedsted, Anne Katrine Blangsted, Gisela Sjøgaard, Karen Søgaard

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The purpose of this laboratory study was to investigate the effects of surface electromyography (EMG)- and mechanomyography (MMG)-based audio and visual biofeedback during computer work. Standardized computer work was performed for 3 min with/without time constraint and biofeedback in a randomized order. Biofeedback was given on the basis of an individual preset threshold value for the right trapezius EMG and MMG signal and a time factor (repetition of events above the threshold). The duration of muscle activity above the preset threshold, the right trapezius EMG and MMG root mean square (RMS) values as well as the work performance in terms of number of completed graph/mouse clicks/errors, the rating of perceived exertion (RPE) and the usefulness of the biofeedback were assessed. The duration of muscle activity above the threshold was significantly lower with MMG compared with EMG as source of biofeedback (p < 0.05). Biofeedback led to a significant decrease in the right trapezius EMG RMS, lower RPE and decreased number of errors and mouse clicks, but also decreased number of completed graphs (p < 0.05). Audio and visual biofeedbacks were as effective. MMG-based biofeedback is a potential reliable alternative to EMG in ergonomics. A lowering of the trapezius muscle activity may contribute to diminish the risk of work related musculoskeletal disorders development.
Original languageEnglish
JournalErgonomics
Volume49
Issue number10
Pages (from-to)921-33
Number of pages12
ISSN0014-0139
DOIs
Publication statusPublished - 15. Aug 2006

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Superficial Back Muscles
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Madeleine, Pascal ; Vedsted, Pernille ; Blangsted, Anne Katrine ; Sjøgaard, Gisela ; Søgaard, Karen. / Effects of electromyographic and mechanomyographic biofeedback on upper trapezius muscle activity during standardized computer work. In: Ergonomics. 2006 ; Vol. 49, No. 10. pp. 921-33.
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abstract = "The purpose of this laboratory study was to investigate the effects of surface electromyography (EMG)- and mechanomyography (MMG)-based audio and visual biofeedback during computer work. Standardized computer work was performed for 3 min with/without time constraint and biofeedback in a randomized order. Biofeedback was given on the basis of an individual preset threshold value for the right trapezius EMG and MMG signal and a time factor (repetition of events above the threshold). The duration of muscle activity above the preset threshold, the right trapezius EMG and MMG root mean square (RMS) values as well as the work performance in terms of number of completed graph/mouse clicks/errors, the rating of perceived exertion (RPE) and the usefulness of the biofeedback were assessed. The duration of muscle activity above the threshold was significantly lower with MMG compared with EMG as source of biofeedback (p < 0.05). Biofeedback led to a significant decrease in the right trapezius EMG RMS, lower RPE and decreased number of errors and mouse clicks, but also decreased number of completed graphs (p < 0.05). Audio and visual biofeedbacks were as effective. MMG-based biofeedback is a potential reliable alternative to EMG in ergonomics. A lowering of the trapezius muscle activity may contribute to diminish the risk of work related musculoskeletal disorders development.",
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Effects of electromyographic and mechanomyographic biofeedback on upper trapezius muscle activity during standardized computer work. / Madeleine, Pascal; Vedsted, Pernille; Blangsted, Anne Katrine; Sjøgaard, Gisela; Søgaard, Karen.

In: Ergonomics, Vol. 49, No. 10, 15.08.2006, p. 921-33.

Research output: Contribution to journalJournal articleResearchpeer-review

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AU - Søgaard, Karen

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