The Effects of Knee Joint Angle and Contractor Intensity on Perceived Exertion

This study examined knee joint angle and knee muscle contraction intensity effects on perceived exertion during isometric contractions. Fourteen healthy young adults participated in five experimental exercise sessions in which knee angles varied randomly (10°, 30°, 50°, 70°, and 90°), each separated...

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Bibliographic Details
Published in:Perceptual and motor skills 2018-12, Vol.125 (6), p.1123-1139
Main Authors: Pincivero, Danny M., Thomas, Staci M.
Format: Article
Language:English
Subjects:
Adult
Humans
Isometric Contraction - physiology
Knee
Knee Joint - physiology
Male
Muscle Contraction - physiology
Muscle, Skeletal - physiology
Perception - physiology
Physical Exertion - physiology
Young Adult
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Summary:This study examined knee joint angle and knee muscle contraction intensity effects on perceived exertion during isometric contractions. Fourteen healthy young adults participated in five experimental exercise sessions in which knee angles varied randomly (10°, 30°, 50°, 70°, and 90°), each separated by one week. During each session, subjects performed five isometric maximal voluntary contractions (MVCs) of knee extension, followed by nine, randomly ordered submaximal contractions (10%–90% MVC, 10% increments). The participants repeated the identical procedure for the knee flexor muscles. Immediately following each submaximal contraction, participants rated their perceived exertion using a modified Borg category-ratio scale. We found that the participants’ overall ratings of perceived exertion were significantly (p 
ISSN:0031-5125
1558-688X
DOI:10.1177/0031512518797859