Changes in dynamic strength index in response to strength training

Comfort, P ORCID: https://orcid.org/0000-0002-1131-8626, Thomas, C, Dos'Santos, T, Suchomel, TJ, Jones, PA ORCID: https://orcid.org/0000-0002-3295-7670 and McMahon, JJ 2018, 'Changes in dynamic strength index in response to strength training' , Sports, 6 (4) , p. 176.

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Abstract

The primary aim of this investigation was to determine the effects of a four-week period of in-season strength training on the dynamic strength index (DSI). Pre and post a four-week period of strength-based training, twenty-four collegiate athletes (age = 19.9 ± 1.3 years; height = 1.70 ± 0.11 m; weight 68.1 ± 11.8 kg) performed three isometric mid-thigh pulls and countermovement jumps to permit the calculation of DSI. T-tests and Cohen’s effect sizes revealed a significant but small (p = 0.009, d = 0.50) decrease in DSI post-training (0.71 ± 0.13 N·N−1) compared to pre-training (0.65 ± 0.11 N·N−1); however, when divided into high and low DSI groups, differential responses were clear. The low DSI group exhibited no significant or meaningful (p = 1.000, d = 0.00) change in DSI pre to post-training (0.56 ± 0.05 N·N−1, 0.56 ± 0.09 N·N−1, respectively), whereas the high DSI group demonstrated a significant and large decrease (p = 0.034, d = 1.29) in DSI pre to post-training (0.85 ± 0.05 N·N−1, 0.74 ± 0.11 N·N−1, respectively), resulting in a significant and moderate difference (p = 0.034, d = 1.29) in the change in DSI between groups. These results demonstrate that DSI decreases in response to strength training, as expected, due to an increase in isometric mid-thigh pull peak force, with minimal change in dynamic (countermovement jump) peak force

Item Type:	Article
Schools:	Schools > School of Health and Society > Centre for Health Sciences Research
Journal or Publication Title:	Sports
Publisher:	MDPI
ISSN:	2075-4663
Related URLs:	Publication Publisher
Depositing User:	USIR Admin
Date Deposited:	19 Dec 2018 13:32
Last Modified:	19 Dec 2018 15:01
URI:	http://usir.salford.ac.uk/id/eprint/49564

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