The reliability of novel, temporal-based dynamic strength index metrics.

James, L ORCID: https://orcid.org/0000-0002-0598-5502 and Comfort, P ORCID: https://orcid.org/0000-0002-1131-8626 2022, 'The reliability of novel, temporal-based dynamic strength index metrics.' , Sports biomechanics , pp. 1-12.

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Abstract

The purpose of this study was: i) to determine the reliability of alternate forms of the dynamic strength index (DSI) calculated over time-specific intervals that represent decisive actions in sport and ii) to assess the association between the original form of the DSI (DSI ) and its variants. Twenty-three resistance-trained males (BM = 80.4 ± 10.18 kg; age = 26.3 ± 10.2 y; 1-RM squat kg/kg/BM = 1.61 ± 0.37) performed trials of the countermovement jump (CMJ) and isometric squat. Several variations of the DSI were calculated by dividing the mean force in the CMJ by the mean force in the isometric squat calculated over the following epochs: 100 ms (DSI ), 150 ms (DSI ) and CMJ propulsive phase duration (DSI ). In the fourth method, mean force across the CMJ propulsive phase duration was divided by mean force in the isometric squat between initiation and peak force (DSI ). All alternate DSI measures achieved acceptable absolute reliability (CV < 10%), however they did not achieve at least a moderate relative reliability. DSI (  = 0.41), DSI (  = 0.03) and DSI (  = 0.14) demonstrated limited commonality with DSI . The alternate forms of DSI can cautiously be considered in strength assessment systems.

Item Type:	Article
Schools:	Schools > School of Environment and Life Sciences
Journal or Publication Title:	Sports biomechanics
Publisher:	Taylor and Francis
ISSN:	1752-6116
SWORD Depositor:	Publications Router
Depositing User:	Publications Router
Date Deposited:	17 May 2022 14:12
Last Modified:	17 May 2022 14:12
URI:	https://usir.salford.ac.uk/id/eprint/63217

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