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Purpose: The purpose of this study was to investigate and to compare acute effects
of combined weight and elastic resistance during jump squats on peak power and electromyography.
Method: Thirteen male (Purposive sampling) from Faculty of sports science, Chulalongkorn University. (Age, 18-25years old.) performed 1 set of 6 repetitions of jump squats at 30% of 1RM. A counterbalance experimental design was used for various combined weight and elastic resistance training at 90:10, 80:20, 70:30, 60:40 and 50:50 respectively. Each experiment was conducted after 48 hours of the experiment. The data were analyzed by using mean, standard deviation and located the difference by using one-way of variance with repeated measures. The significant was set at p<.05.
Results: (1) The average value of peak power of combined weight and elastic training at 50:50 was significant higher than combined weight and elastic training at 90:10 and 80:20 (p < .05). No significant different in peak power was observed between the combined weight and elastic training at 90:10, 80:20, 70:30 and 60:40. (2) The average value of Rectus femoris, Vastus medialis, Gastrocnemius medialis and Tibialis anterior electromyography with combined weight and elastic training at 90:10, 80:20, 70:30, 60:40 and 50:50 was no significant at .05.
Conclusion: The combined weight and elastic resistance training at 50:50 during jump squats at 30% of 1RM can be used to enhance peak power speed better than the combined weight and elastic resistance training at 90:10, 80:20,70:30 and 60:40.
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