Effect of fatigue on hamstring coactivation during isokinetic knee extensions |
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Authors: | Joseph P Weir Dennis A Keefe Jason F Eaton Robert T Augustine and Dawn M Tobin |
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Institution: | (1) Program in Physical Therapy, University of Osteopathic Medicine and Health Sciences, 3200 Grand Avenue, Des Moines, IA 50312, USA, US |
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Abstract: | We examined the effect of fatigue of the quadriceps muscles on coactivation of the hamstring muscles and determined if the
response is different between two isokinetic speeds in ten males and ten females with no history of knee pathology. Electromyographic
data were recorded from the vastus lateralis and biceps femoris muscles during 50 maximal knee extensions at isokinetic speeds
of 1.75 rad · s−1 (100° · s−1) and 4.36 rad · s−1 (250° · s−1). A greater degree of coactivation was apparent at the higher speed, but the increase in coactivation of the hamstring muscles
was similar at both speeds. The results revealed that: (1) coactivation is greater at a higher isokinetic speed, and (2) coactivation
increases during fatigue, but the rate of increase is independent of contraction velocity.
Accepted: 15 June 1998 |
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Keywords: | Co-contraction Concentric Electromyography Quadriceps Hamstrings |
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