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KMID : 1023920100120040071
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Journal of the Korean Academy of Kinesiology
2010 Volume.12 No. 4 p.71 ~ p.79
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The Effect of Adaptation of Exercise Intensity on Agonist iEMG, MEF, and Muscular Strength on the Supine Bench Press after Pec Deck
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Kim Jong-Sin
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Abstract
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INTRODUCTION: The purpose of this study was to examine the effects of exercise intensity on agonist muscle activation, muscle fatigue, and muscular strength on the bench press.
METHOD: Seven healthy college age students participated in this study. All subjects were tested for their one repetition maximum(RM) strength on the supine bench press. Surface electrodes were attached on the belly of the pectoralis major and the bellies of the triceps brachii; long, medial, and lateral head. Normalized iEMG and MEF were collected and compared to three sites on the triceps brachii and measured iEMG and MEF according to the intensity resistance training loading method. One-way ANOVA repeated measurement and t-test were used to identify significant differences between single and multi-joint exercises on the different intensity variables. An alpha level of .05 was used to determine the significance level.
RESULT: 1.the result of the 10RM after pectoralis major single joint all-out pre exercise on the exercise load method showed [bench press 10RM after pec dec 50% 10RM all-out exercise] was higher than [bench press 10RM without pre exercise] in the iEMG of pectoralis major(p<.05). The [bench press 10RM without pre exercise] was lower than [bench press 10RM after pec deck 10RM all out exercise] and [bench press 10RM after pec deck 50% 10RM all out exercise] in the iEMG of the lateral head of the triceps brachii(p<.05, p<.001). The MEF of the pectoralis major on bench press 10RM after pre fatigue exercise showed [bench press 10RM without pre exercise] which was lower than [bench press 10RM after pec deck 10RM all out exercise] and [bench press 10RM after pec deck 50% 10RM all out exercise] (p<.05, p<.001). The long head of the triceps brachii showed [bench press 10RM after pec deck 50% 10RM all out exercise] which was higher than [bench press 10RM without pre exercise] in the EMF(p<.05). 2. the practice number of bench press 10RM after single joint all-out pre exercise on exercise load method showed [bench press 10RM after pec dec 50% 10RM all out exercise] which was lower than [bench press 10RM after pec deck 10RM all out exercise] (p<.05).
CONCLUSION: When the muscle fatigue(MEF) of pectoralis major was high, the muscle activity(iEMG) of triceps brachii became high.
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KEYWORD
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iEMG, MEF, Pec deck, Bench press, iEMG, MEF.
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