RELATIONSHIP BETWEEN VERTICAL STIFFNESS AND REACTIVE STRENGTH INDEX MODIFIED IN COLLEGE-AGED MALES DURING JUMPING

Authors

Julio B. Morales, Louisiana State UniversityFollow
Julio Morales, Lamar UniversityFollow
Jose A. Santiago, Sam Houston State UniversityFollow
Heather A. Abbott, Indiana State UniversityFollow
Alfred E. Finch, Indiana State UniversityFollow

Category

Methods / Statistics

Document Type

Paper

Abstract

The present study analyzed ground reaction forces that occur during a counter-movement vertical jump (CMVJ) to examine how measures assessing stretch-shortening cycle (SSC) interact. The participants consisted of thirteen recreationally active males that volunteered for this study. Vertical ground reaction forces were measured using a force platform sampling at 1000 Hz and exported into an RStudio vertical jump program for further analysis. A simple linear regression was performed to investigate the relationship between vertical stiffness and modified reactive strength index (RSI_mod). Modified reactive strength index was a significant predictor of vertical stiffness (p = .010, Adj. R²= .421). These results suggest that further examination of the mathematical equation used for RSI_mod is needed to eliminate possible effects of confounding variables as relationship differences were observed with the vertical stiffness measure that has been used for adequate assessment of the lower extremity muscle-tendon units’ status during counter-movement vertical jumping and other movements utilizing the SSC.

Recommended Citation

Morales, Julio B.; Morales, Julio; Santiago, Jose A.; Abbott, Heather A.; and Finch, Alfred E. (2023) "RELATIONSHIP BETWEEN VERTICAL STIFFNESS AND REACTIVE STRENGTH INDEX MODIFIED IN COLLEGE-AGED MALES DURING JUMPING," ISBS Proceedings Archive: Vol. 41: Iss. 1, Article 82.
Available at: https://commons.nmu.edu/isbs/vol41/iss1/82