Fatigue-induced changes in myoelectric signal characteristics and perceived exertion

Perceived exertion (RPE) has been used as a subjective indicator of exercise intensity for extremely light to supramaximal-level dynamic exercise. Little data exist on the relationship of RPE to physiological variables during sustained isometric exercise. Ten male subjects volunteered and participat...

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Bibliographic Details
Published inCanadian journal of sport sciences Vol. 14; no. 2; p. 99
Main Authors Hasson, S M, Williams, J H, Signorile, J F
Format Journal Article
LanguageEnglish
Published United States 01.06.1989
Subjects
Adult
Electromyography
Fatigue - physiopathology
Hand
Humans
Isometric Contraction
Male
Muscles - physiology
Physical Endurance
Physical Exertion
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Summary:Perceived exertion (RPE) has been used as a subjective indicator of exercise intensity for extremely light to supramaximal-level dynamic exercise. Little data exist on the relationship of RPE to physiological variables during sustained isometric exercise. Ten male subjects volunteered and participated in this investigation. Subjects were instructed to maintain a hand grip contraction of 50% of maximal effort until exhaustion. During this bout of exercise, electromyographic activity (EMG) and RPE values were recorded at 10 s intervals. The raw EMG signals were processed for frequency content (mean power frequency [MPF] and for signal amplitude (root mean squared [RMS]). RPE was recorded as a subjective value selected from a ten-point scale with ratio properties. Analysis of the data indicated that RPE was strongly correlated to both MPF: r2 = (-).922, and RMS: r2 = .729. These data imply that during sustained isometric exercise changes in perceived exertion are related closely to electromyographic activity of the contracting muscle.
ISSN:0833-1235