The Korean journal of sports medicine (대한스포츠의학회지)

The Korean Society of Sports Medicine (대한스포츠의학회)
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Analysis of Isokinetic Strength and Muscle Fatigue on Knee Joint in Middle-School Weight Lifters

남자 중학생 역도선수의 슬관절 등속성 근력 및 근피로도 분석

Yoon, Jin-Hwan;Jeong, Il-Gyu;Lee, Hui-Hyuk
윤진환;정일규;이희혁

  • Published : 20020800
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Abstract

The purpose of this study was to compare the characteristics of strength, power and endurance from isokinetic test and of muscle fatigue as estimated from surface electromyographic(EMG) data taken from quadriceps muscles(M. vastus medialis, M. vastus lateralis) before and after the test. The subjects in this study were 7 male weight lifters and 7 non-athletes who performed maximum isokinetic tests of the knee in concentric and eccentric(respectively 3 repeat at $60^{\circ}$/sec, 3 repeat at, 26 repeat at $180^{\circ}$/sec. modes). The frequency components of the surface EMG power spectrum were analyzed using median frequency[MP]. The following results were observed; There were significant differences between two groups in mean values of peak torque and peak torque per body weight(Kg) both for flexion and extension at $60^{\circ}$/sec and $180^{\circ}$/sec. There were significant differences between two groups in mean values of angle at peak torque both for flexion and extension at $60^{\circ}$/sec and $180^{\circ}$/sec. There were significant difference between two groups in average power and average power per body weight(Kg) both for flexion and extension at $180^{\circ}$/sec. There were significant difference between two groups in mean values of accel time both for flexion and extension at $180^{\circ}$/sec. There were no significant differences in endurance ration but significant differences in total work between two groups both for flexion and extension at $180^{\circ}$/sec. There were no significant difference between two groups in mean values of muscle fatigue ration of vastus medialis, vastus lateralis both for flexion and extension at $180^{\circ}$/sec. The results permit the conclusion that the work for weight lift leads to higher strength and power during short-term repetitive maximal contraction but have little effect to enhance endurance. Therefore the middle-school male lifters may be easily fatigable in repetitive maximal contractions, leading to muscle demage. A greater scope of endurance training and increased number of training stimuli over individual threshold levels might be applied efficiently to improve muscle.

Keywords

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