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n International SportMed Journal - A comparison of training with light, regular and heavy balls with the same workload on overhead throwing velocity with different weighted balls in children : original research article
Background: Throwing is a fundamental ability that children learn during their youth. There are different ways to train this throwing ability in children.
Research question: The aim of this study was to examine the effect of training throwing in children with light, regular or heavier balls in an overhead throwing movement and transferring to other ball weights after a short training period. It was hypothesised that all training groups would significantly improve their throwing velocity due to the throwing training, but that each group increased the most with the ball they trained with during the training period because of the specificity principle.
Type of study: A randomised controlled study.
Methods: Thirty primary school children (age 8.5 ± 0.5 yr, body mass 33.3 ± 6.7kg, height 1.35 ± 0.04 m), divided into three groups (underweight ball: 0.35 kg, regular ball: 0.45 kg and overweight ball: 0.5 kg training group), participated in the study. Each group conducted the same total throwing workload twice a week for six consecutive weeks. Throwing velocity and distance with a 0.35 kg, 0.45 kg, 0.5 kg and a 1 kg ball was tested before and after a training period.
Results: A significant (p ≤ 0.05) increase in throwing velocity (10-18%) and distance (16-19%) was found after the six-week training period with every ball with no significant differences between groups.
Conclusions: This study indicates that training workload is of importance for enhancement of ball throwing performance and not especially for the ball weight that is thrown with for children. Furthermore, this training also had a positive effect upon throwing performance with heavier balls (1 kg) indicating that transfer to heavier balls is possible in throwing for children.
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