The Effects of Repeated Iron Shot on Muscle Fatigue  in Upper Muscles

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Exerc Sci > Volume 15(1); 2006 > Article

Exercise Science 2006;15(1): 9-16.

반복적인 아이언 샷이 상지근의 근피로도에 미치는 영향

김광준, 신윤아

서울대학교

The Effects of Repeated Iron Shot on Muscle Fatigue in Upper Muscles

ABSTRACT

Kim, K.J., Shin, Y.A. The Effects of Repeated Iron Shot on Muscle Fatigue in Upper Muscles. Exercise Science, 15(1): 9-16. 2006. The purpose of this study is to analyze the EMG(electromyography) responses of upper muscles(left/right deltoids and left/right flexor carpi radialis) from the repeated iron shots. The subjects participated in this study were six healthy, high school attending, golf player and six beginners with no systemic diseases. To analyze the MPF(mean power frequency) seventy-five times of iron shots were repeatedly performed. The measurement of EMG from repeated iron shots for the analysis of MPF was taken at fifteenth, thirtieth, fourth-fifth, sixtieth, and seventy-fifth shots. The video tape for the analysis of swing phase was recorded at the same time of all EMG measurements.. The swing phase was differentiated by Address and Backswing, Downswing and Impact, and Follow through and Finish. The results of comparison of MPF between two groups indicated that MPF of skilled hand group was significantly decreased (p<0.05) only at the Downswing and Impact phase of left flexor carpi radialis. However, the beginners indicated significant MPF decrease (p<0.05) of right deltoid, flexor carpi radialis and left deltoid at all swing phases and swing phases of left flexor carpi radialis except for Follow through and Finish phase. From the above stated facts, the beginners indicated fatigues of each muscle at almost all swing phases for the repeated iron shots and this was a result of a swing mechanism with excessive strength. Therefore, it can be said that the beginners may easily be injured from the repeated practices.

Key words: Iron shot, Mean Power Frequency, Muscle Fatigue