This study assessed the relationship of long and short stretch-shortening cycle test scores to sprint performances in trained female athletes. Seventeen trained, female, high school, competitive sprinters completed the following tests: countermovement jump for vertical distance (CMJ), bounce drop jump for height with minimum ground contact time (BDJ index), and ground contact time (GCT) during the BDJ and a 5-step bound (5B) test. Group mean and SD values were as follows: height, 167.7 +/- 3.7 cm; body mass, 59.9 +/- 7.2 kg; and percentage of body fat (PF), 20.3 +/- 1.8%. Sprint performances at 30-, 100-, and 300-m distances were assessed. Stretch-shortening cycle performance and sprint results (mean +/- SD) were as follows: CMJ, 33.8 +/- 3.8 cm; BDJ index, 166.7 +/- 24.7 cm/s; 5B test, 10.98 +/- 0.76 m; 30-m sprint, 4.58 +/- 0.17 seconds; 100-m sprint, 12.9 +/- 0.61 seconds; and 300-m sprint, 45.03 +/- 2.94 seconds. Correlations indicated that no relationship existed between PF and the dependent sprint variables. Significant correlations (p < 0.05) existed between CMJ and 30-m (r = -0.60), 100-m (r = -0.64), and 300-m (r = -0.55) sprint times; BDJ index and 30-m (r = -0.79) and 100-m (r = -0.75) sprint times; and 5B test and 300-m sprint time (r = -0.54). Multiple regression analysis found significant T values for BDJ index with 30-and 100-m sprints and CMJ and PF with 300 m. Results indicated that the BDJ index and CMJ tests were significantly related to sprint performances in female athletes.
(C) 2001 National Strength and Conditioning Association