1. The acute effect of verbal instructions on performance and landing when dropping from different heights: the ground reaction force-time profile of drop vertical jumps in female volleyball athletes
- Author
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Stefano La Greca, Gaetano Antonacci, Stefano Marinelli, Pierangelo Cifelli, and Riccardo Di Giminiani
- Subjects
plyometric ,motor learning ,explosive strength ,exercise physiology ,sport ,Sports ,GV557-1198.995 - Abstract
IntroductionThe drop vertical jump (DVJ) is extensively utilized for conditioning and evaluating physical performance, as well as reducing the likelihood of injury by enhancing joint stability through the coactivation of muscles acting on the joint. The execution of DVJ can be controlled by verbal instructions and evaluated by the vertical ground reaction force (vGRF)-time profile.MethodsOur hypothesis was that varying verbal instructions could have an impact on the DVJ's parameter, thereby optimizing vertical performance and minimizing the impact during landing in young female volleyball players. Sixteen female volleyball players volunteered to participate in this study (age: 21.3 ± 2.6 years; stature: 1.66 ± 0.1 m; body mass: 62.0 ± 8.1 kg and BMI: 22.2 ± 1.8). They executed DVJs following verbal instructions ranging from “jump as high as possible” (1A), “jump as quickly as possible” (2A), “jump as high as possible and during the landing attempt to dampen the impact at ground contact” (1B), and “jump as high as quickly as possible and during the landing attempt to damp the impact at ground contact” (2B). The reactive strength index (RSI), vGRF (1st and 2nd peaks), and flight time (FT) were evaluated.ResultsThe verbal instructions 1A improved the FT and the first peak of the vGRF (P
- Published
- 2024
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