Abstract
This research aims to evaluate causes of injuries that could occur in the landing process, using the dynamic postural stability index (DPSI), by examining drop jumps and countermovement jumps in the experimental condition, thus exploring ways for injury prevention. For this research, a total of 22 male collage students (age: 23.1 ± 1.7 yrs, height: 177.0 ± 5.7 cm, weight: 69.2 ± 5.7 kg) joined the experiment. Items for the measurement included the front and rear, the left and right and vertical ground reaction forces using a force platform (2000 Hz). With measuring the above items, the study evaluated anterior-posterior stability index, mediolateral stability index, vertical stability index and dynamic postural stability index. The result showed that the peak anterior GRF and peak medial GRF, APSI, and %APSI were high in the drop jump, with the time for the peak vertical ground reaction force being delayed. In the case of countermovement jump, which is a sequence of actions, it showed that the peak posterior GRF, loading rate, VSI, DPSI and %VSI were high.
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