Abstract
To evaluate the maximal jump height from three different start positions of the vertical jump test (VJ), ten female college basketball players (age 19.6 ± 1.1 yr., ht. 169.9 ± 9.9 cm, and body mass 64.2 ± 10.2 kg.) volunteered to participate in three trials. Start position was self-selected (SS), 25% below the center of gravity (−25%), and 50% below the center of gravity (−50%). Three trials were performed at each position. An infrared beacon was strapped to the abdomen to obtain position and displacement within 2 mm. The following data were obtained: Despite a significant difference (ANOVA, p < .05) between the −25% and −50% trials as related to the depth of pre-start position from the center of gravity and the degree of knee flexion, the power output and VJ were almost identical. The optimal pre-jump position was between the moderate (−25%) and extreme (−50%) range of motion, and was obtained through self-selection. Although all trials exhibited excellent power output as compared to norms (> 78 kgm/sec), experience obtained from many years of playing basketball may have permitted these players to determine the optimal pre-jump position.Table
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