Intersession Reliability of Kinematic and Kinetic Variables During Vertical Jumps in Men and Women

Abstract

Purpose:To investigate the intersession reliability of selected kinematic and kinetic variables during countermovement vertical jumps (CMJs).Methods:Thirty-five men and 35 women performed CMJs on a force platform during four testing sessions each separated by 1 wk. Kinematic variables included time in the air (TIA), take-off velocity (TOV), total vertical displacement of the center of mass (TJH). and countermovement depth, whereas kinetic variables included positive impulse, negative impulse, vertical stiffness, and rates of force development. Systematic bias was assessed by calculating the 90% confidence interval of the change in the mean between consecutive testing sessions and between the first and final testing session for each variable. Coefficients of variation (CV) and intraclass correlation coefficients (ICC) were also calculated.Results:Systematic bias was observed only for peak rate of force development during the concentric phase of the movement. For TIA, TOV, and TJH, CV values ranged from 1.7% to 6.6%, with ICC values ranging from 0.82 to 0.97. The other variables showed greater variation (CV range: 1.7% to 39.9%; ICC range: 0.04 to 0.99). Only slight gender differences were found in the reliability statistics, and the reliability of most of the variables was diminished as the time between the testing sessions was increased.Conclusion:Even though practitioners can expect good reliability for jump height measured from a force platform in men and women, other kinematic and kinetic variables often assessed during vertical jumps may not be reliable.

A new approach to determining net impulse and identification of its characteristics in countermovement jumping: reliability and validity

“…Rate of force development in this study indicates how rapidly force changes (i.e. the rate of change) from the beginning to the end of the countermovement-stretching phase (Moir, Garcia, & Dwyer, 2009). During this phase, a jumper begins to stop the countermovement for the subsequent upward movement speculatively to stretch involved muscles and tendons and activate stretch reflex (Kibele, 1998).…”

Fiabilidad de los tests de salto vertical en gimnastas prepuberales

“…Estudios realizados con adultos también destacan la alta repetitividad (ICC ≥ 0,83) entre sesiones de estos tests 12,17 . Particularmente con las gimnastas, la variabilidad entre sesiones es comparable a la que otros autores encontraron en adultos 12,15 y en poblaciones infantiles 16 , observándose en los niños una reproducibilidad intersujeto e intrasujeto elevada en SJ, CMJ y CMJA, que aumentaba en una segunda sesión (ICC ≥ 0,80; CV ≤ 9,19) 16 .…”

“…Particularmente con las gimnastas, la variabilidad entre sesiones es comparable a la que otros autores encontraron en adultos 12,15 y en poblaciones infantiles 16 , observándose en los niños una reproducibilidad intersujeto e intrasujeto elevada en SJ, CMJ y CMJA, que aumentaba en una segunda sesión (ICC ≥ 0,80; CV ≤ 9,19) 16 . En nuestro caso, ambos grupos mejoraron su reproducibilidad en SJ en la segunda sesión, con valores similares a los encontrados por Martin et al 16 (tabla 2).…”

“…Aunque la fiabilidad del squat jump (SJ), del countermovement jump (CMJ) y del drop jump (DJ) ya ha sido estudiada en adultos [10][11][12][13][14][15] , no existen apenas informes sobre la fiabilidad del salto en poblaciones infantiles. En un estudio realizado con niños de entre 6 y 8 años de edad 16 se encontraron índices de reproducibilidad aceptables en SJ y CMJ, similares a los resultados obtenidos por Viitasalo 14 con niños de 11 años.…”

Influence of neural mobilization of lower limbs on the functional performance and dynamic balance in asymptomatic individuals: a cross-over randomized controlled trial

“…This measure has high reliability (intra-class correlation coefficients [ICC] ranging from 0.82 to 0.97) [23]. The participant maintained the bipedal stance on the platform with hands on hips and performed the highest possible jump with countermovement (countermovement jump).…”