Abstract
Abstract Thirty young adult males performed the vertical jump (jump and reach) at knee angles of 65, 90, and 115 degrees while using lateral and anterior-posterior foot spacings of 0, 5, 10, and 15 inches. The preliminary position was held momentarily before jumping, and every subject jumped three times at each of the 48 combinations of knee angles and foot spacings. The average of the three jumps was considered the subject's score for each preliminary stance. The results revealed that: (a) knee angle, lateral foot spacing, and anterior posterior foot spacing exert independent effects on vertical jumping performance; and (b) the most effective preliminary stance seems to be one in which the knee angle is approximately 115° with the feet spread from 5 to 10 inches laterally and slightly in excess of 5 inches anteriorly-posteriorly.
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