Relationships of the 5-Jump Test (5JT) Performance of Youth Players With Volleyball Specific’ Laboratory Tests for Explosive Power

Abstract

Volleyball involves movements with and/or without horizontal approaches (i.e., spike jumps, jump setting, blocking). The 5-jump test (5JT) was suggested to assess lower limb explosive power of athletes competing in some disciplines (e.g., soccer, judo, running). It appears that no previous study has investigated the 5JT performance components in volleyball players. This study aimed to test the relationship between 5JT performance and two specific laboratory tests for explosive power (i.e., countermovement jump [CMJ] and squat jump [SJ]). Forty volleyball players (boys, mean age: 12.4 ± 0.8 years) were tested for 5JT, CMJ, and SJ tests. 5JT performance was expressed in absolute terms (m), and relative to leg length (5JT LL ) and body mass (5JT BM ). The SJ and CMJ tests were evaluated using the optojump photoelectric cells and the following data were collected: peak power (Pp) of jump (W, W.kg -0.67 ), peak jumping force (F peak , N), peak jumping velocity (V peak , m/s), peak heights of CMJ and SJ (CMJ H and SJ H , respectively, cm). Only significant ( p 0.30 were considered. 5JT performance was significantly correlated with SJ, V peak ( r = 0.90), SJ H ( r = 0.88), Pp [W.kg -0.67 ( r = 0.86), W ( r = 0.72)], F peak ( r = 0.45); and CMJ, V peak ( r = 0.82), CMJ H ( r = 0.80), Pp [W.kg -0.67 ( r = 0.89), W ( r = 0.85)], F peak ( r = 0.73). 5JT LL values were significantly related to SJ, Pp [W ( r = 0.81), W.kg -0.67 ( r = 0.74)], V peak ( r = 0.82); and CMJ, Pp [W ( r = 0.73), W.kg -0.67 ( r = 0.84)], V peak ( r = 0.75), F peak ( r = 0.67)]. 5JT BM values were significantly related to SJ, Pp (W, r = −0.43). To conclude, in youth volleyball players, the 5JT may be viewed as an explosive strength diagnostic instrument under field circumstances.