Inter- and Intra-Correlations of Jump Performance Tests in Female Collegiate Volleyball Players

Jump testing is fundamental in the evaluation of volleyball players. Basic questions center around the reliability of various jump tests and the interrelationship of these tests. Depending on the intercorrelation among the various jump tests, it may be possible to simplify testing to allow one performance variable to evaluate jump performance. PURPOSE: The purpose of this study was to determine the reliabilities among selected jump performance tests and evaluate their interrelationship in female collegiate volleyball players. METHODS: NCAA Division II varsity players (n = 14, age = 19.3 ± 1.3 y, height = 176.7 ± 7.7 cm, weight = 69.0 ± 6.4 kg) were tested for countermovement vertical jump (CMVJ), 3-step approach jump (AVJ), drop jump height (DJH), ground contact time (GCT), and reactive strength (RS). RS was determined by dividing DJH by GCT. Each player performed three trials of each test. RESULTS: Single-test reliabilities exceeded ICO0.922, except for GCT (ICC = 0.846). Three-trial reliabilities exceeded ICC> 0.943 for all tests. The inter-correlation coefficients for peak jump scores ranged from r = 0.932 to 0.962 (p