The object of this study was to investigate the changes in physical param- eters produced during an in-season resistance training (RT) and detraining (DT, or RT cessation) in 16 high level team handball players (THPs). Apart from normal practice sessions, THPs un- derwent 12 weeks of RT. Subjects performed 3 sets of 3–6 reps with a load of 70–85% concentric 1 repetition maximum bench press (1RMBP), 3 sets of 3–6 reps with a load of 70–95% of 4 repetition maximum parallel squats (4RMPS), plus vertical jumps and sprints. The 1RMBP, 4RMPS, speed over 30 m (S30), jump (countermovement jump height [CMJ]; CMJ with addi- tional weights [20kg and 40kg], and ball throw velocity (BTv) were tested before the experimental period (T1), after 6 weeks (T2), and after the 12-week experimental period (T3). Immedi- ately after these 12 weeks, THPs started a 7-week DT period, maintained normal practices. The CMJ and the BTv were the only parameters evaluated during DT. The most important gains (p ? 0.001) in S30 were obtained between T1-T2 and T1-T3. The BTv improved significantly (p ? 0.001) only between T1-T2 and T1-T3. The most relevant increases (p ? 0.001) in jumping per- formance took place between T1-T2 and T1-T3. The 1RMBP showed significant increases (p?0.001) only between T1-T2 and T1-T3. The 4RMPS increased significantly between all testing trials. After the DT, THPs showed no significant losses in CMJ performance. However, they declined significantly in BTv (p ? 0.023). The results suggest that elite THPs can optimize impor- tant physical parameters over 12 weeks in-season and that 7 weeks of DT, although insufficient to produce significant de- creases in CMJ, are sufficient to induce significant decreases in BTv. It is concluded that after RT cessation THPs reduced BTv performance.
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