Validade e confiabilidade do sensor inercial de baixo custo no ambiente de prática e treinamento esportivo do voleibol

Abstract

The aim of the present study was to verify the validity and reliability of the low cost inertial sensor for the measurement of height in standardized vertical jumps, blocking jumps with and without side step and attack jumps (step close) of volleyball in the environment of sports practice. Sixty four male and female volleyball players aged between 15 and 18 years participated in the study. These athletes performed, at two different moments, standardized vertical jump tasks and a circuit of specific volleyball skills. To measure the performance in the jumps, an inertial sensor, a contact mat and an action camera was used. Concurrent validity was verified using the BlandAltman procedure, and the reliability of measurements was performed using the Intraclass Correlation Coefficient (ICC2.k) and the standard error of the measurement. In all analyses, the significance level adopted was α<0.05. In both concurrent validity analyses, bias was not significant by the single-sample t test. On the other hand, the ICC results were significant, considered excellent (values > 0.9), and with low EPM values for all jumps. We conclude that low-cost inertial sensors are valid and reliable to verify the measurement of the height of crouching and counter-movement vertical jumps, as well as blocking jumps with and without side step and attack jumps in a sports practice environment.