EFFECTS OF DIFFERENT APPROACH LENGTHS OF THE LAST STRIDE ON VOLLEYBALLER RUN UP VERTICAL JUMPS
Keywords: approach length, vertical jump, ground reaction force (GRF)
AbstractThe present investigation quantified differences among maximal-effort jumping performances by a volleyball player with different approach lengths of last stride. Twelve well-trained male volleyball players aged from 17 to 19 years volunteered after informed consent was obtained from all subjects (height:186.18 ± 6.1 cm; body mass:76.6 ± 6.3 kg ). Each subject was required to perform a number of maximal-effort run up vertical jump on the force plate (Quattro jump, Kistler Inc.) with different lengths ( 50, 100, 150 cm) of last approach stride. The results indicated that total vertical impulses of length 150cm (356 N-s) were greater than other two length trials( length 50cm: 329 N-s; length100: 339 N-s) although the time for total impulse were not significantly longer than the others. It also implied that the performance with length 150cm approach had the greatest average force between each trial.
Coaching and Sports Activities
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