The acute effects of eccentric-only, concentric-only and eccentric followed by concentric training on jumping and sprint performance in male rugby football players
Abstract:
The purpose of this study was to investigate and compare acute effects of eccentric-only, concentric-only and eccentric followed by concentric training on jumping and sprint performance in male rugby football players. Ten male rugby football players of Chulalongkorn University 18-25 yrs. (age, 22.10±3.17 yrs.; weight, 85.09±15.93 kg.; height, 173.70±5.59 cm.; 1RM back squat 1.79±0.14 kg/BM-1), performed three counterbalanced sessions: Eccentric followed by concentric (EFC); Eccentric-only (ECC); and Concentric-only (CON). The peak power (PP), peak velocity (PV), peak force (PF), rate of force development 100 and 250 (RFD100 and RFD250), and 10 and 20 sprint time were assessed before the experiment to set as baseline and after each intervention. The data were analyzed by One-way analysis of variance with repeated measures and Friedman One-Way Repeated Measure Analysis of Variance by Ranks. The statistical significance was set at the level 0.05. EFC, ECC, and CON showed a significantly greater PP and PV (P<0.05) over baseline. In addition, EFC presented significantly better on PP, PV, RFD100 and RFD250 (P<0.05) than ECC and CON. However, ECC and CON showed a significantly greater PF (P<0.05) over EFC. There were no significant differences (P>0.05) in 10- and 20-sprint time between three methods. Conclusion, EFC was the greatest improvement in PP and PV it also improved RFD100 and 250. These findings suggest that EFC increases CMJ performance in male rugby football players.