Mr John McMahon J.J.McMahon@salford.ac.uk
Reliability of and relationship between flight time to contraction time ratio and reactive strength index modified
McMahon, JJ; Lake, JP; Comfort, P
Authors
JP Lake
Prof Paul Comfort P.Comfort@salford.ac.uk
Professor of Strength & Conditioning
Abstract
Countermovement jump (CMJ) force-time testing is commonly used to monitor seasonal alterations in athletes’ CMJ strategy (to infer alterations in neuromuscular function). The flight time to contraction time (FT:CT) ratio and reactive strength index modified (RSImod) are considered to be two primary CMJ variables of interest. Due to similar calculations, it is likely that the FT:CT ratio and RSImod share similar reliability and an almost perfect relationship. Consequently, there may be no requirement to include both variables in CMJ monitoring reports. This study aimed to investigate this by recruiting twenty-five males to perform three CMJs on a force platform across two sessions that were separated by one week. The FT:CT ratio and two calculations of RSImod (based on the jump height from either flight time or take-off velocity) were then calculated using robust methods. The between-day reliability was good-excellent for all of the variables (95% confidence interval range of the coefficient of variation = 2.02–9.22%) with no significant between-day differences noted (p ≥ 0.231). There was an almost perfect positive relationship between the FT:CT ratio and RSImod regardless of the calculation method (r = 0.944–0.947, p < 0.001). As the FT:CT ratio and RSImod yield similar absolute reliability and share 90% of common variance, there is little reason to include both variables in CMJ monitoring reports.
Citation
McMahon, J., Lake, J., & Comfort, P. (2018). Reliability of and relationship between flight time to contraction time ratio and reactive strength index modified. Sports, 6(3), 81. https://doi.org/10.3390/sports6030081
Journal Article Type | Article |
---|---|
Acceptance Date | Aug 14, 2018 |
Online Publication Date | Aug 15, 2018 |
Publication Date | Aug 15, 2018 |
Deposit Date | Aug 21, 2018 |
Publicly Available Date | Aug 21, 2018 |
Journal | Sports |
Publisher | MDPI |
Volume | 6 |
Issue | 3 |
Pages | 81 |
DOI | https://doi.org/10.3390/sports6030081 |
Publisher URL | https://doi.org/10.3390/sports6030081 |
Related Public URLs | http://www.mdpi.com/journal/sports |
Files
sports-06-00081.pdf
(1.4 Mb)
PDF
Licence
http://creativecommons.org/licenses/by/4.0/
Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/
You might also like
Downloadable Citations
About USIR
Administrator e-mail: library-research@salford.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search