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KMID : 1142420200180030375
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PNF and Movement
2020 Volume.18 No. 3 p.375 ~ p.382
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Muscle Contraction Onset Time Characteristics of Gluteus Maximus and Hamstring According to Knee Flexion Angles During Prone Hip Extension
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Kim Yong-Wook
Song Je-Hyun
Jeong Yeon-Woo
Lee Kyeoung-Seok
Guk Ga-Yeong
Yun Sung-Joon
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Abstract
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Purpose: The purpose of this study was to investigate the muscle contraction onset time characteristics of the gluteus maximus, semitendinosus, and biceps femoris muscles at different knee flexion angles in individuals with shortened or over-lengthened hamstrings performing prone hip extension.
Methods: Twenty-six participants were divided into a hamstring shortened group (n = 12) and hamstring lengthened group (n = 14). Wireless surface electromyography was used to verify the muscle onset time of the gluteus maximus, semitendinosus, and biceps femoris when performing prone hip extension at different knee flexion angles.
Results: There were significant differences in the muscle onset times of the semitendinosus and biceps femoris between the hamstring shortened group and hamstring lengthened group (p < 0.05). In addition, there was a significant difference in the muscle contraction onset times among of the gluteus maximus, semitendinosus, and biceps femoris muscles when performing prone hip extension at a knee flexion of 90˚ in the hamstring shortened group (p < 0.05) and a knee flexion angle of 0˚ in the hamstring lengthened group (p < 0.05).
Conclusion: In all groups, there was no effect on the onset time of the gluteus maximus muscle according based on the knee angle. In addition, the knee flexion angles affected the onset time of the muscle contraction of the gluteus maximus muscle in the hamstring shortened group and hamstring lengthened group with an abnormal length of the hamstring muscle.
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KEYWORD
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Hip extensor, Muscle length, Onset time
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