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Sulma-periods or bursts: which risk estimating parameters should be used in analyses of long time EMG recordings
National Institute of Occupational Health, Oslo, Norway.
University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. University of Gävle, Centre for Musculoskeletal Research.
University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. University of Gävle, Centre for Musculoskeletal Research.ORCID iD: 0000-0003-1443-6211
2010 (English)In: The XVIII Congress of the International Society of Electrophysiology and Kinesiology (ISEK), Aalborg, Denmark, 2010Conference paper, Published paper (Refereed)
Abstract [en]

AIM: Sustained trapezius muscle activity has been shown to increase the risk of neck and shoulder pain: number of eight-minute-periods with sustained low-level muscle activity >0.5% EMGmax (SULMA-periods, (1)), and more than 70% of burst time, i.e. working time above 2% EMGmax (2). Both studies consider the occurrence of continuous muscle activity above a certain discrimination level. The aim of this study was to evaluate the effect of data processing procedures on similar measures of sustained trapezius muscle activity.

METHODS: Full-day bilateral EMG from upper trapezius muscles were collected from forty subjects (17 men, 23 women, median age 22 years, range 22-26), who had just left technical school and started mainly as hairdressers, electricians and students. Number of periods and total duration of activity above discrimination levels 0.5, 1 and 2% EMGmax were retrieved from data processed by each of six Root Mean Square (RMS) window lengths. Several analyses of patterns of activity and rest were made, and this paper presents some basic descriptives concerning total duration of muscle activity.

RESULTS: The static muscle activity level (APDF) was 0.3% EMGmax and the mean burst time was 65%. The total time of muscle activity depended largely on the discrimination level (Figure: panel A compared to B). For all discrimination levels, the total activity time increased with an increasing RMS length, and became larger when the demands for a minimum period duration were relaxed (figures A and B).

CONCLUSION: Thus, muscle activity patterns extracted from EMG are highly sensitive to the data processing procedure and we suggest that a standardized approach should be developed so that future studies will be comparable.

Place, publisher, year, edition, pages
Aalborg, Denmark, 2010.
Identifiers
URN: urn:nbn:se:hig:diva-7033OAI: oai:DiVA.org:hig-7033DiVA, id: diva2:326265
Conference
The XVIII Congress of the International Society of Electrophysiology and Kinesiology (ISEK)
Available from: 2010-06-22 Created: 2010-06-22 Last updated: 2018-03-13Bibliographically approved

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Forsman, MikaelMathiassen, Svend Erik

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CiteExportLink to record
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