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KMID : 1023920140160020051
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Journal of the Korean Academy of Kinesiology
2014 Volume.16 No. 2 p.51 ~ p.62
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Effects of Method and Intensity of Resistance Exercise on Pectoralis Major and Triceps Brachii iEMG, MEF, Repetition at 10RM Bench Press after Single Joint All out Pre Exercise
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Kim Ki-Hong
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Abstract
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INTRODUCTION: The purpose of this study was to examine the effects of Method and Intensity of Resistance Exercise on agonist muscle activation(iEMG), muscle fatigue(MEF), Repetition at 10RM Bench Press after single joint all out pre Exercise.
METHOD: Fourteen healthy college students participated in this study. All subjects were tested for their 10RM, 50% 10RM strength on the Lying Triceps Extension, Peck Deck Fly and 10RM, strength on the 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 from the Lying Triceps Extension and, Peck Deck Fly exercise showed that 10RM intensity was higher than that of 50% 10RM in the iEMG of Triceps brachii and Pectoralis major(p<.000). 2. the result from the Lying Triceps Extension and, Peck Deck Fly exercise showed that 10RM intensity was higher than that of 50% 10RM in the MEF of Triceps brachii and Pectoralis major(p<.000). 3. the result from the 10RM Bench Press showed that Bench Press exercise after peck deck fly all-out exercise was higher than that of Bench Press exercise after Lying Triceps Extension all-out exercise in the iEMG of Pectoralis major(p<.000). 4. the result from the 10RM Bench Press showed that Bench Press exercise after 10RM peck deck fly all-out exercise was the highest in the MEF of Triceps brachii and Pectoralis major(p<.000). 5. The order of the intensity in all-out pre-exercise was 10RM peck deck fly, 10RM Lying Triceps Extension, 50% 10RM Lying Triceps Extension in the Repetition of 10RM Bench Press(p<.000, p<.05 ).
CONCLUSION: Triceps extension in the 10RM plays very importanct role in bench press exercise. High levels of muscle activation and low muscle fatigue of tricep brachii leads to greater Bench Press repetition
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KEYWORD
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Single joint Exercise, iEMG, MEF, Repetition
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