Effects of 10-week eccentric overload training on kinetic parameters during change of direction in football players

The aim of the current study was to analyse the effect of 10-week eccentric overload training on kinetic parameters during change of direction (COD) in U-19 football players. The outcome measured included relative peak braking (rPB) and propulsive force (rPF), contact time (CT), time spent during braking (BT) and propulsive phase (PT), relative total (rTOTIMP), braking (rBIMP) and propulsive (rPIMP) impulses. Between-group results showed a substantial better improvement (likely) in CT (ES: 0. 72) and BT (ES: 0. 74) during side-step cutting, and in rPB (ES: 0. 84) and rBIMP (ES: 0. 72) during crossover cutting, in the experimental group (EXP) in comparison to control group (CON). Within-group analysis showed a substantially better performance (likely to almost certain) in CT (ES: 1. 19), BT (ES: 1. 24), PT (ES: 0. 70), rPB (ES: 0. 75), rPF (ES: 0. 68), rTOTIMP (ES: 0. 48) and rBIMP (ES: 0. 50) in EXP during side-step cutting. Regarding crossover cutting, within-group analysis showed a substantial better performance (likely to almost certain) in CT (ES: 0. 75), rPB (ES: 0. 75), rPF (ES: 1. 34), rTOTIMP (ES: 0. 61), rBIMP (ES: 0. 76) and rPIMP (ES: 0. 46) in EXP. In conclusion, the eccentric overload-based programme led to an improvement in kinetic parameters during COD football tasks.