Purpose: This study examined the effects of an 8-week Nordic hamstring exercise (NHE) training on components of physical performance in young female handball players. Methods: Participants were allocated to an experimental group (EG; n=10; age: 15.9 [0.2] y) and a control group (CG; n=9; age: 15.9 [0.3] y). The EG performed NHE (2-3 sessions/wk) in replacement of some handball-specific drills, whereas the CG followed regular handball training. Pretraining and posttraining tests were carried out for the assessment of sprint speed (5 m, 10 m, and 20 m), jump performance (countermovement jump [CMJ] height), change-of-direction (t test), and repeated-sprint ability (RSA total time [RSAtotal], RSA best time [RSAbest], and RSA fatigue index [RSAFI]). Data were analyzed using magnitude-based inferences. Results: Within-group analyses for the EG showed moderate performance improvements for 5, 10, and 20 m (effect size [ES]=0.68-0.82), t test (ES=0.74), and CMJ (ES=0.85). Trivial to small improvements were observed for RSA (ES=-0.06 to 0.35). For the CG, within-group outcomes showed performance decrements with moderate (t test [ES=0.71]), small (5 m [ES=0.46] and RSAbest [ES=0.20]), and trivial magnitude (10 m [ES=0.10], 20 m [ES=0.16], and RSAtotal [ES=0.00]). Furthermore, trivial to small performance improvements were found for CMJ (ES=0.10) and RSAFI (ES=0.5). Between-group analyses revealed small to large effects in favor of EG for 5 m (ES=1.07), 10 m (ES=0.66), 20 m (ES=0.53), t test (ES=1.38), and RSA (ES=0.68-0.78). A trivial between-group difference was demonstrated for CMJ (ES=-0.01). Conclusions: The NHE training intervention, in replacement of some handball-specific drills, was more effective than regular handball training in improving physical performance (ie, linear sprint time, jumping, change-of-direction, and RSA) in young female handball players.
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