| Summary: | 碩士 === 國立清華大學 === 體育學系所 === 106 === Objective: Exploration of muscle activation in upper limbs as well as the disparity of swaying area of COP during different archery period. Method: Fourteen male archers with more than three year experiences attend this research, and their average age is 20.1±2.8 years old, with average height 174.2±5.51 cm, average weight 73.7±8.11 kg. Square feet stance and open feet stance groups are arranged and each group has seven attenders. Delsys Trigno® Wireless EMG systems, Boston, MA, USA, 2000 Hz is utilized to collect muscle active parameters of bowing arm, especially, extensor carpi, flexor carpi, biceps brachii muscle, triceps brachii muscle, and trapezius muscle. Zebris pressure plate is placed under the feet of attenders to fetch their swaying areas during 4 archery periods. The Olympic qualified mode is conducted in the research, so each attender has 36 shots per round. After using embedded software of the wireless EMG system to process the original EMG, it will be normalized by MVC (maximum voluntary muscle contraction) for comparison. During 4 archery periods of two stances, two-way ANOVA (analysis of variance) is implemented by SPSS 12.0 software to analyze the muscle activation in the upper limbs and the swaying area of COP exported from the software of Zebris. When the statistics reach a significant level α=.05, a posteriori test based on Tukey method is investigated. Results: There is no significant difference in the swaying area of COP during 4 archery periods of both feet stances. The trapezius muscle activation in the upper limbs under both feet stances can be found that its activation during the fourth archery period is higher than that during the third archery period. Furthermore, during the third and fourth archery periods, the flexor carpi muscle activation in the upper limbs under open feet stance is higher than that under square feet stance.
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