手榴彈投擲之肌電圖分析

The Electromyography Analysis of Grenade Throwing

劉于詮(Yu-Chuan Liu) ； 陳協鴻(Shie-Hung Chen) ； 陳星宇(Hsing-Yu Chen)

《國立體育學院論叢》 16卷3期 (2005/12) Pp. 205-218

https://doi.org/10.6591/JPES.2005.12.16

摘要

The purpose of this study was to investigate the acting mechanism of muscles by analyzing their activation in grenade and baseball throwing. 15 males who were mature and fitting to serve acted as the subjects (22.0±1.5 years, 172.0±5.0 cm, 70.0±6.7kg). VICON motion analysis system was used to define the throwing phase. BIOPAC EMG system was used to gather EMG signal, filter (band pass filter, cut-off frequency was 20Hz to 400Hz) and analyze muscles’ activation. Results showed: 1. Trapezius and anterior deltoid stabilized shoulder girdle in grenade throwing. Consequently, they were categorized in Group Ⅰ-stabilizer. Latissimus dorsi and pectoralis were classified as Group Ⅱ-accelerator due to their higher activation to accelerate throwing arm in acceleration phase and stabilize shoulder girdle in follow through. Biceps brachii, Extensor carpi radialis and flexor carpi ulnaris which acted to stabilize elbow and accept the transfer of energy from the larger trunk and shoulder girdle were categorized in Group Ⅰ-stabilizer. Although the pattern of activation was similar to the Group Ⅱ-accelerator, it was hard to classify triceps brachii by the concept to classify muscle as Group Ⅱ-stabilizer or Group Ⅲ-accelerator due to it was not the major contributor to the velocity of projectile. 2. In grenade throwing, the activation of trapezius in follow through and the activation of latissimus dorsi in acceleration phase were bigger significantly (p＜.05) than the activations which were produced by the same muscle in the same phase during the process of baseball throwing. So trapezius and latissimus dorsi were pretty important when human was throwing the heavier projectile-grenade.

關鍵字

手榴彈 ； 肌電圖 ； 肌肉活化程度

並列摘要

The purpose of this study was to investigate the acting mechanism of muscles by analyzing their activation in grenade and baseball throwing. 15 males who were mature and fitting to serve acted as the subjects (22.0±1.5 years, 172.0±5.0 cm, 70.0±6.7kg). VICON motion analysis system was used to define the throwing phase. BIOPAC EMG system was used to gather EMG signal, filter (band pass filter, cut-off frequency was 20Hz to 400Hz) and analyze muscles’ activation. Results showed: 1. Trapezius and anterior deltoid stabilized shoulder girdle in grenade throwing. Consequently, they were categorized in Group Ⅰ-stabilizer. Latissimus dorsi and pectoralis were classified as Group Ⅱ-accelerator due to their higher activation to accelerate throwing arm in acceleration phase and stabilize shoulder girdle in follow through. Biceps brachii, Extensor carpi radialis and flexor carpi ulnaris which acted to stabilize elbow and accept the transfer of energy from the larger trunk and shoulder girdle were categorized in Group Ⅰ-stabilizer. Although the pattern of activation was similar to the Group Ⅱ-accelerator, it was hard to classify triceps brachii by the concept to classify muscle as Group Ⅱ-stabilizer or Group Ⅲ-accelerator due to it was not the major contributor to the velocity of projectile. 2. In grenade throwing, the activation of trapezius in follow through and the activation of latissimus dorsi in acceleration phase were bigger significantly (p＜.05) than the activations which were produced by the same muscle in the same phase during the process of baseball throwing. So trapezius and latissimus dorsi were pretty important when human was throwing the heavier projectile-grenade.

並列關鍵字

grenade ； electromyography ； muscle actication

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