The Effect of Variations in Knee and Hip Angles on Electromyographic Activity of the Hamstrings and Related Muscles During the Nordic Hamstring Exercise.

IF 1.6 Q3 SPORT SCIENCES
International Journal of Sports Physical Therapy Pub Date : 2024-03-02 eCollection Date: 2024-01-01 DOI:10.26603/001c.92745
Taspol Keerasomboon, Toshiaki Soga, Norikazu Hirose
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Abstract

Background: The benefit of performing the Nordic Hamstring Exercise (NHE) on an inclined board has been described, however, isometric hamstring activation in different knee and hip angles has not yet been thoroughly explored.

Purpose: This study investigated the effect of variations in knee and hip angles during the isometric performance of the NHE on electromyographic activity of the hamstring muscles.

Study design: Crossover study.

Methods: Thirteen male volunteers performed isometric contractions during the NHE with the knee (30°, 50°, 60°) and the hip (0°, 30°, and 45°) in various angles of flexion on a leg support platform which was inclined at 30°. An electrical goniometer was used to monitor the knee and hip joint angles during 5-s isometric contractions. A multivariate analysis of variance with repeated measures was used to compare normalized electromyographic values of each muscle across different knee and hip angles, followed by pairwise comparisons.

Results: The electromyographic activity of the biceps femoris, semitendinosus, and semimembranosus at a knee angle of 30° and hip angle of 0° were significantly higher than those observed with a knee angle of 50° and hip angle of 0°, or a knee angle of 60° and hip angle of 0° (p<0.05). The electromyographic activity of the semimembranosus at a knee angle of 60° and hip angle of 45° was significantly higher than values obtained with knee and hip angles of 60° and 0°, respectively (p<0.05).

Conclusions: The results indicate that using a knee flexion of 30° and a hip flexion of 0°, while isometrically performing the NHE on a platform inclined at 30°, may optimize electromyographic activity of the hamstrings.

Level of evidence: 3.

北欧式腘绳肌运动中膝关节和髋关节角度变化对腘绳肌及相关肌肉肌电图活动的影响
背景:目的:本研究调查了在斜板上进行北欧腘绳肌锻炼(NHE)的益处,但尚未对不同膝关节和髋关节角度下的腘绳肌等长激活进行深入探讨:研究设计:交叉研究:13 名男性志愿者在倾斜 30° 的腿部支撑平台上进行 NHE 等长收缩时,膝关节(30°、50°、60°)和髋关节(0°、30° 和 45°)处于不同的屈曲角度。在 5 秒钟等长收缩过程中,使用电动量角计监测膝关节和髋关节角度。采用重复测量的多变量方差分析比较每块肌肉在不同膝关节和髋关节角度下的归一化肌电值,然后进行配对比较:结果:膝关节角度为 30°、髋关节角度为 0°时,股二头肌、半腱肌和半膜肌的肌电活动明显高于膝关节角度为 50°、髋关节角度为 0°,或膝关节角度为 60°、髋关节角度为 0°时所观察到的肌电活动(p结论:结果表明,在倾斜度为 30°的平台上进行 NHE 运动时,膝关节屈曲 30°,髋关节屈曲 0°,可以优化腘绳肌的肌电活动:3.
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来源期刊
CiteScore
2.50
自引率
5.90%
发文量
124
审稿时长
16 weeks
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