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Power spectral density analysis of the electromyogram from a work task performed in a full pressure suitSurface electromyograms (EMG) taken from three upper torso muscles during a push-pull task were analyzed by a power spectral density technique to determine the utility of the spectral analysis for identifying changes in the EMG caused by muscular fatigue. The results confirmed the value of the frequency analysis for identifying fatigue producing muscular performance. Data revealed reliable differences between muscles in fatigue induced responses to various locations in the reach envelope at which the subjects were required to perform the push-pull exercise, and the differential sensitivity of individual muscles to the various reach positions; i.e., certain reach positions imposed more fatigue related shifts in EMG power than did others. It was found that a pressurized space suit changed the pattern of normal shirtsleeve muscle fatigue responses in all three of the muscles.
Document ID
19740013627
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Lafevers, E. V. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Date Acquired
September 3, 2013
Publication Date
May 1, 1974
Subject Category
Biotechnology
Report/Patent Number
JSC-09004
NASA-TM-X-58136
Accession Number
74N21740
Funding Number(s)
PROJECT: RTOP 961-50-50-89-DE
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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