Kinetic parameters as determinants of vertical jump performance

This study evaluated force and velocity parameters of vertical jump performance in countermovement jump (CMJ) and squat jump (SJ) and compared results for sprint runners and volleyball players. Twenty-four male athletes (12 regional/national-level sprint runners and 12 national-level volleyball players) 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 (MF), rate of force development (RFD,) and time to reach maximum force (TMF). In CMJ, jump height was correlated with PV (r=0.97) and normalized MF (r=0.47), whereas jump power was significantly correlated with all variables, except MF (r=0.12). In SJ, PV and normalized MF were significantly correlated with jump height (r=0.95 and r=0.51) and power (r=0.80 and r=0.87). In addition, TMF was inversely correlated with power (r=-0.49). Runners had higher performance variables (height and power), normalized MF and PV than volleyball players in both CMJ and SJ. Velocity and maximum force were the main determinants of height and power in the two types of vertical jumps. However, explosive force (RFD and TMF) was also important for power production in vertical jumps. Runners had a better vertical jump performance than volleyball players.Original Abstract: Este estudo objetivou identificar parametros de forca e velocidade relacionados com o desempenho nos saltos verticais (SV) Counter Movement Jump (CM) e Squat Jump (SJ); comparar estes parametros entre corredores velocistas e voleibolistas. Participaram 24 atletas do sexo masculino (12 velocistas de nivel estadual/nacional e 12 voleibolistas de nivel nacional). Os atletas realizaram os SV CMJ e SJ sobre uma plataforma de forca, sendo analisadas variaveis de desempenho (altura do salto e potencia), pico de velocidade (PV), forca maxima (Fmax) absoluta e relativa, taxa de desenvolvimento de forca (TDF) e tempo para atingir a forca maxima (TFmax). No CMJ, a altura correlacionou-se com o PV (r=0,97) e com a Fmax normalizada (r=0,47), enquanto que a potencia relacionou-se com todas as variaveis, exceto com a Fmax absoluta (r=0,12). No SJ, o PV e a Fmax normalizada correlacionaram-se com a altura obtida (r=0,95; r=0,51, respectivamente) e com a potencia (r=0,80; r=0,87, respectivamente). Alem disso, a TFmax tambem correlacionou-se com a potencia (r=-0,49). Os velocistas apresentaram valores superiores nas variaveis de desempenho do salto (altura