Objective: The goal of this study was to investigate the effects of a 5-week, basketball-specific high-intensity interval training (HIIT) on aerobic performance in youth female basketball players. Methods: Twenty-four athletes (age 15.1 ± 1.1 years; height: 170 ± 5.2 cm; body mass: 60.9 ± 6.0 kg) took part in the investigation. The training group (TG, n = 11) integrated 10 basketball-specific HIIT sessions in their normal team training, the other group (n = 13) continued their team training routine and served as controls (CG). All HIIT sessions contained different basketball-specific drills. Before (pre-) and after the training period (post-) physical fitness was tested. Results: The Yo-yo intermittent recovery test (Yo-yo IR) performance was very likely increased in the TG (26,5 %). No improvements in the Yo-Yo IR performance were found in the CG (-6,8%). Likely positive effects in the TG were evident for the sprint and agility tests with (1.2 ± 2.4%, ES: 0.25, p = 0.29) and without ball (1.5 ± 4.6%, ES: 0.34, p = 0.20). The sprint and agility performance with ball significantly decreased in the CG by -2.8 ± 4.7% (ES: 0.49, p < 0.01). No differences between the groups were found for counter movement jump with arm swing (TG: ES = 0.14, p = 0.45, CG: ES = 0.20 p = 0.18), counter movement jump (TG: ES = 0.05, p = 0.70, CG: ES = 0.19, p = 0.10), squat jump (TG: ES = 0.06, p = 0.72, CG: ES = 0.10, p = 0.54) and long jump (TG: ES = 0.00, p = 0.82, CG: ES = 0.00, p = 0.81). Conclusion: A 5-week, basketball-specific HIIT improves the aerobic performance in young female basketball athletes.
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