EMG-angle relationship of the hamstring muscles during maximum knee flexion

The aim of the present study was to investigate the EMG–joint angle relationship during voluntary contraction with maximum effort and the differences in activity among three hamstring muscles during knee flexion. Ten healthy subjects performed maximum voluntary isometric and isokinetic knee flexion....

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Bibliographic Details
Published in:Journal of electromyography and kinesiology 2002-10, Vol.12 (5), p.399-406
Main Authors: Onishi, Hideaki, Yagi, Ryo, Oyama, Mineo, Akasaka, Kiyokazu, Ihashi, Kouji, Handa, Yasunobu
Format: Article
Language:English
Subjects:
Adult
Electromyography
EMG
Hamstrings
Humans
Knee angle
Knee Joint - physiology
Male
Maximum voluntary contraction
Muscle Contraction
Muscle, Skeletal - physiology
Range of Motion, Articular
Torque
Wire electrode
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Summary:The aim of the present study was to investigate the EMG–joint angle relationship during voluntary contraction with maximum effort and the differences in activity among three hamstring muscles during knee flexion. Ten healthy subjects performed maximum voluntary isometric and isokinetic knee flexion. The isometric tests were performed for 5 s at knee angles of 60 and 90°. The isokinetic test, which consisted of knee flexion from 0 to 120° in the prone position, was performed at an angular velocity of 30°/s (0.523 rad/s). The knee flexion torque was measured using a KIN-COM isokinetic dynamometer. The individual EMG activity of the hamstrings, i.e. the semitendinosus, semimembranosus, long head of the biceps femoris and short head of the biceps femoris muscles, was detected using a bipolar fine wire electrode. With isometric testing, the knee flexion torque at 60° knee flexion was greater than that at 90°. The mean peak isokinetic torque occurred from 15 to 30° knee flexion angle and then the torque decreased as the knee angle increased ( p
ISSN:1050-6411
1873-5711
DOI:10.1016/S1050-6411(02)00033-0