Abstract
The aim of this study was to identify force and velocity parameters related to vertical jump performance in counter movement jump (CMJ) and squat jump (SJ), and to compare these parameters between sprint runners and volleyball players. Twenty-four male athletes (12 regional/national-level sprint runners and 12 national-level volleyball players) participated in this study. The athletes performed CMJ and SJ on a force platform. The following variables were analyzed: jump performance (jump height and power), peak velocity (PV), absolute and relative maximum force (Fmax), rate of force development (RFD,) and time to reach maximum force (TFmax). In CMJ, jump height was correlated with PV (r=0.97) and normalized Fmax (r=0.47), whereas jump power was significantly correlated with all variables, except for Fmax (r=0.12). In SJ, PV and normalized Fmax were significantly correlated with jump height (r=0.95 and r=0.51, respectively) and power (r=0.80 and r=0.87, respectively). In addition, TFmax was inversely correlated with power (r=-0.49). Runners presented higher performance variables (height and power), normalized Fmax and PV than volleyball players in both CMJ and SJ. In conclusion, velocity and maximum force were the main determinants of height and power in the two types of vertical jump. However, explosive force (RFD and TFmax) was also important for power production in vertical jumps. Finally, runners presented a better vertical jump performance than volleyball players.
Highlights
Vertical jump (VJ) performance is one of the best indications of lower limbs muscle power[1 ]
According to evidence described by Hill[6], there is a hyperbolic relation between these variables, and an optimal combination of force and speed should be achieved to optimize the production of power
This study aimed: (i) identified the force and velocity parameters associated with countermovement jump (CMJ) and squat jump (SJ) performance; and (ii) compared these parameters for sprint runners and volleyball players
Summary
Vertical jump (VJ) performance is one of the best indications of lower limbs muscle power[1 ]. According to evidence described by Hill[6], there is a hyperbolic relation between these variables, and an optimal combination of force and speed should be achieved to optimize the production of power. This combination of loads will vary according to the characteristics of the player and the type of training, in which the stronger and/or slower individuals usually achieve their maximum power at lower speeds than the faster ones. RFD, defined as the rate of force increase in a given time interval, is an important parameter to measure neuromuscular performance of athletes in sports that use explosive muscle contractions[8,11]. Movements in certain sports modalities, or, technical components, do not use all their force potential for movements; in such cases, this rate of force variation, known as explosive force, is more important[11]
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