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KMID : 1135520100060010089
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Korean Journal of Exercise Rehabilitation
2010 Volume.6 No. 1 p.89 ~ p.97
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Electromyographic Analysis of Activities on Muscles of Upper Body accounting to Training Level during Bench Press Exercise
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Lee Hyung-Kook
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Abstract
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The purpose of present research is to understand scientifically how the role of major muscle among upbody muscles during bench press to measure and analyses using EMG according to training levels and grip types. Subjects were 15 male who 7 weight training beginner group(BG: 22±2.4 yrs) and 8 middle level group(MG: 24±0.7 yrs). The main measurements of this study are used EMG(Laxtha QEMG-4, Korea) to investigate electrical muscle activites of upbody muscles during bench press exercise. They were attached electrods on optimal sites upbody (CPMM: center of pectoralis major muscle, UPMM: upper of pectoralis major muscle, ADM: anterior deltoide muscle, TBM: triceps brachii muscle). Expreimental proceeding were 1RM test with bench press, 30 min resting, and then 5 bench press exercise with 75% 1RM load using two defferent grip types(normal and wide way). The analysis used the SPSS 17.0 version. It were producted Mean and SD(standard division) and investigated the grips different within groups used pairs t-test, and compared with the upbody muscles within groups used One-way ANOVA. On various muscles EMG ratio against the 1RM, in MG using normal grip, UPMM’ activation was larger than other muscle, and in using wide grip CPMM was more activated than other muscles. In BG was showed as same result, too. In normal grip, the result showed that it had significant difference among upper body muscles in MG(F=7.279, p<.001; F=3.657, p<0.05 respectively). Especially, the UPMM and ADM represented higher EMG activation than other muscles. Also, ADM’ EMG activation had difference between normal grip and wide in all two groups(t=-2.251, p<0.05; t=-2.385, p<0.05 respectively). Finally, we knew that there are different EMG activation on upper body relative muscles according to one’ training experience and using grip types during bench press exercise.
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KEYWORD
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bench press, pectoralis major muscle, anterior deltoide muscle, triceps brachii muscle, EMG
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