Flywheel eccentric overload training versus plyometric training on countermovement jump parameters, badminton-specific agility and flexibility amongst university badminton players

Abstract

Introduction: Considering training constraints where badminton players need to focus on many fitness components, it is essential to incorporate training methods that could effectively train power, agility and flexibility simultaneously. The objective of this study was to compare the effectiveness of flywheel eccentric overload (FEO) training (overloaded concentric action) and plyometric training (PT) on countermovement jump (CMJ) parameters, badminton-specific agility and hamstring flexibility following a 4-week period amongst university badminton players. Methods: A total of 36 university badminton players were randomly assigned to the FEO group, PT group and control group (CG) using counterbalancing. All groups maintained their regular badminton training, with FEO and PT groups performing additional interventions consisting of two additional physical training per week for 4 weeks. The participants were assessed on the CMJ, Badcamp agility test as well as a sit-and-reach test before and after the intervention. Results: There were significant pre- to post-test improvements in the CMJ height (P = 0.001), modified reactive strength index (RSI) (P = 0.001) and Badcamp agility test (P = 0.001) for both the FEO and PT groups when compared to CG. In terms of these variables, no significant differences were found between the two training groups after intervention. The sit-and-reach test results revealed no significant differences amongst all groups, implying that neither of the experimental training methods appears effective in enhancing hamstring flexibility. Conclusion: FEO training (overloaded concentric action) and PT have similar effectiveness in improving CMJ height, modified RSI and badminton-specific agility amongst university badminton players over 4 weeks.