Reliability of and relationship between flight time to contraction time ratio and reactive strength index modified

McMahon, John J, Lake, Jason P. and Comfort, Paul (2018) Reliability of and relationship between flight time to contraction time ratio and reactive strength index modified. Sports, 6 (3). ISSN 2075-4663

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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 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 separated by one week. The FT:CT ratio and two calculations of RSImod (based on jump height from either flight time or take-off velocity) were then calculated using robust methods. Between-day reliability was good-excellent for all 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 calculation method (r=0.944-0.947, p<0.001). As the FT:CT ratio and RSImod yield similar absolute reliability and share 90% common variance, there is little reason to include both variables in CMJ monitoring reports.

Item Type: Article
Uncontrolled Keywords: countermovement jump, force platform, jump height, jump monitoring, jump strategy
Subjects: Q Science > QM Human anatomy
Q Science > QP Physiology
Divisions: Research Centres > CCASES
Departments > Sport and Exercise Sciences
Related URLs:
Depositing User: Jason Lake
Date Deposited: 16 Aug 2018 14:06
Last Modified: 23 Oct 2018 11:05
URI: http://eprints.chi.ac.uk/id/eprint/3601

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