Abstract:
The purpose of this study was to compare effects of different inter-repetition rest periods of power-endurance training on bench press throw in amateur boxers.Eighteen male amateur boxers, age between 15-18 years old, from Suphanburi Sport School participated in this study. Before the experiment, all subjects underwent a resistance training program at a load of 60% 1RM, twice a week for two weeks for familialization. Thereafter, the participants were randomly assigned into three experimental groups matched by 1RM bench press. The first group (G1) performed a power-endurance program consisted of 20 repetitions at a load of 30% 1RM with continuous repetitions. The second (G2) and third (G3) group performed an identical training program but with 2 and 4 seconds inter-repettions rest periods, respectively. Each group continued to train twice a week for a total of 6 weeks. Average barbell velocity, force production, and power-endurance during a bench press throw were measured before and after 6 weeks of training. Data were expressed as means ± S.D. and were analyzed using One-way ANOVA analysis for physical characteristic and One-way ANCOVA for barbell velocity, force, and power-endurance followed by Bonferroni post- hoc test. The statistical significant was set at p-value < .05 Results:There were no significant differences in age, body weight, body mass index, and relative bench press strength among three groups. However, a significant higher (P< .05) power-endurance was observed at a load of 30% 1RM in G3 than that in G2. No differences in average barbell velocity were observed at 15%, 30% and 40% 1RM among three group. Nevertheless, average force and power-endurance were higher (p< .05) at loads of 30% and 40% 1RM compared with 15% 1RM in each group. After 6 weeks of training, Average barbell velocity, average force and power-endurance were significantly improved (p< .05) at loads of 15% and 30% 1RM, but not 40% 1RM, in all three groups, with a greater of magnitude observed in G1 and G2. Conclusion: Our results demonstrated that power-endurance training with a continuous and 2 second inter-repettions have favorable effects on average barbell velocity, average force, and power-endurance during a bench press throw and could therefore be used as an adjunctive exercise program for improving power-endurance in young amateur boxers.