Reliability of surface EMG measurements over 12 hours

Abstract Bone and muscle are both compromised during long-term space flight. Experiments are, therefore, in progress using surface electromyography (EMG) and joint angle measurements to compare muscle action on earth and in space over complete working days. To date, there is little information on th...

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Bibliographic Details
Published in:Journal of electromyography and kinesiology 2007-06, Vol.17 (3), p.365-371
Main Authors: Ochia, Ruth S, Cavanagh, Peter R
Format: Article
Language:English
Subjects:
Adult
Altered
Arm - physiology
Electric Impedance
Electromyography
Feasibility Studies
Female
Gravity
Humans
Male
Muscle
Muscle Contraction - physiology
Muscle, Skeletal - physiology
Physical Medicine and Rehabilitation
Reproducibility of Results
Skeletal
Space Flight
Time Factors
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Summary:Abstract Bone and muscle are both compromised during long-term space flight. Experiments are, therefore, in progress using surface electromyography (EMG) and joint angle measurements to compare muscle action on earth and in space over complete working days. To date, there is little information on the reliability of such long-term EMG measurements available in the literature. Therefore, the current study determined the reliability and feasibility of using surface EMG over a 12-h interval. Ten young subjects performed standardized isometric exercises at 30% of maximum voluntary effort every 2 h throughout a normal working day, which included a period of self-chosen exercise. Surface electrodes remained in place over the biceps brachii (BB), vastus medialis (VM), and gastrocnemius (GN) throughout the day. The normalized integrated EMG for two of the three muscles showed no significant changes during the 12-h period, and only the first observation for VM showed a trend ( p < 0.1) of differences with three of the other measurement periods. The stability of surface EMG measurements over the 12-h period suggests that this methodology is feasible for use in future long-term EMG studies.
ISSN:1050-6411
1873-5711
DOI:10.1016/j.jelekin.2006.01.003