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The effect of exercise-induced muscle damage after a bout of accentuated eccentric load drop jumps and the repeated bout effect

Lookup NU author(s): Dr Deb DulsonORCiD

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Abstract

© 2016 National Strength and Conditioning Association.Although previous studies have investigated exercise-induced muscle damage (EIMD) after a bout of unloaded drop jumps (DJs), none have investigated the effects of accentuated eccentric load (AEL) DJs on EIMD. The purpose of this study was to investigate the effects of 30 and 50 AEL DJs on strength, jump performance, muscle soreness, and blood markers. Eight resistance trained athletes participated in this study. In week 1, baseline countermovement jump (CMJ), squat jump (SJ), concentric and eccentric peak force (PF), creatine kinase, and muscle soreness were assessed. Subjects then completed 30 AEL DJs and baseline measures were retested immediately postintervention, 1, 24, and 48 hours later. Two weeks later, the subjects completed the same protocol with an increase in AEL DJ volume (50). Subjects' SJ height was reduced in week 1 compared with week 3, postintervention, 1, 24, and 48 hours later (ES = -0.34, -0.44, -0.38, and -0.40). Subjects' CMJ height was reduced in week 1 compared with week 3, postintervention, 1, and 24 hours later (ES = -0.37, -0.29, and -0.39). Concentric PF was reduced in week 1 compared with week 3, postintervention and 24 and 48 hours later (ES = -0.02, -0.23, and -0.32). Eccentric PF was reduced in week 1 compared with week 3, postintervention, 24, and 48 hours later (ES = -0.24, -0.16, and -0.50). In this sample, 30 AEL DJs attenuated the effects of EIMD following which 50 AEL DJs completed 2 weeks later.


Publication metadata

Author(s): Bridgeman LA, Gill ND, Dulson DK, Mcguigan MR

Publication type: Article

Publication status: Published

Journal: Journal of Strength and Conditioning Research

Year: 2017

Volume: 31

Issue: 2

Pages: 386-394

Print publication date: 01/02/2017

Acceptance date: 02/04/2016

ISSN (print): 1064-8011

ISSN (electronic): 1533-4295

Publisher: NSCA National Strength and Conditioning Association

URL: https://doi.org/10.1519/JSC.0000000000001725

DOI: 10.1519/JSC.0000000000001725

PubMed id: 27893481


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