Título:	Reactive strength index-modified : reliability, between group comparison, and relationship between its associated variables
Autor(es):	Vieira, Amilton Tufano, James J.
Assunto:	Atletas - esportes de combate Salto de contramovimento Desempenho de salto Ciclo de alongamento-encurtamento Confiabilidade teste-reteste
Data de publicação:	Nov-2020
Editora:	Termedia Publishing
Referência:	VIEIRA, Amilton; TUFANO, James J. Reactive strength index-modified: reliability, between group comparison, and relationship between its associated variables. Biology of Sport, v. 38, n. 3, p. 451-457, 2021. DOI: https://doi.org/10.5114/biolsport.2021.100363. Disponível em: ermedia.pl/Reactive-strength-index-modified-reliability-between-group-comparison-and-relationship-between-its-associated-variables,78,42236,0,1.html. Acesso em: 26 mar. 2021.
Abstract:	To investigate and compare the reliability of reactive strength index-modified (RSImod) and its associated variables (jump height [JH] and [time to take-off]) 20 combat fighters and 18 physically active men participated in this study. They visited the laboratory three times; firstly, for jump familiarization and two sessions for test-retest (2–7 days apart). For both groups, the between-day changes in performance were trivial to small (≤ 1.1%). The coefficient of variation (CV) comparisons (i.e. CV ratio) demonstrated that combat athletes had a lower test-retest variation for RSImod (0.87) and JH (0.80) than non-athletes. Combat athletes demonstrated a greater JH than physically active men (0.43 vs 0.37; p = 0.03, g = 0.73), but small and non-significant differences were observed for RSImod (0.60 vs 0.55; p = 0.24, g = 0.38) and TTT (0.70 vs 0.72; p = 0.32, g = 0.33). RSImod was more positively correlated with JH (r = 0.75–0.87; p < 0.001) than negatively correlated with TTT (r = 0.45–0.54; p < 0.001). This study suggests that RSImod is a reliable variable obtained during CMJ testing in combat athletes and physically active men, with scores being slightly better for combat athletes. In terms of performance, combat athletes jumped higher than physically active men, but no differences in RSImod or TTT were observed. Lastly, RSImod was more strongly related to JH than TTT, and this was more evident in athletes than nonathletes. This indicates that the combat athletes were able to better utilize their (equal) time spent jumping (higher), possibly via greater utilization of the stretch shortening cycle, faster or more optimal motor unit recruitment, or an array of other factors.
Unidade Acadêmica:	Faculdade de Educação Física (FEF)
Licença:	Copyright: Institute of Sport. This is an Open Access article distributed under the terms of the Creative Commons Attribution Share Alike 4.0 License (https://creativecommons.org/licenses/by-sa/4.0/), allowing third parties to copy and redistribute the material in any medium or format and remix, transform, and build upon the material for any purpose, even commercially, provided the original work is properly cited and states its license. Fonte: https://www.termedia.pl/Reactive-strength-index-modified-reliability-between-group-comparison-and-relationship-between-its-associated-variables,78,42236,1,1.html. Acesso em: 26 mar. 2021.
DOI:	https://doi.org/10.5114/biolsport.2021.100363
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