The acute effects of repeated sprints on inter-limb asymmetries during unilateral jumping

Bishop, Chris, McCauley, W., Read, Paul, Gonzalo-Skok, O., Lake, Jason P. and Turner, Anthony (2019) The acute effects of repeated sprints on inter-limb asymmetries during unilateral jumping. Journal of Strength and Conditioning Research. ISSN 1064-8011

Text (This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Strength and Conditioning Research.Copyright © 2019 by the National Strength & Conditioning Association)
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The aim of the present study was to investigate the effects of multiple repeated sprints on unilateral jump performance and inter-limb asymmetries. Eighteen recreationally active males performed three single leg countermovement jumps (SLCMJ) as baseline data. The repeated sprint protocol was 6 x 40 m with 20 seconds of passive rest between each sprint. This protocol was conducted four times, each set separated by four minutes of rest. Within that rest period, subjects performed one SLCMJ on each limb after two minutes of rest. A one-way ANOVA showed significant reductions (p < 0.05; ES = -0.52 to -0.99) in jump height on both limbs after each set relative to baseline. Inter-limb asymmetries increased at each time point and ranged from 7.62-14.67%, with significant increases in asymmetry seen after sets three (p = 0.046) and four (p = 0.002). Significant increases in sprint time were shown between sprints one and six in each set (p ≤ 0.01). A fatigue index (%) was also calculated and showed an exponential increase from 5.74% (set one) to 13.50% (set four), with significant differences between all sets (p < 0.001) with the exception of sets three and four. Results from this study show that a 6 x 40 m repeated sprint protocol is a sufficient dose for implementing acute fatigue in recreationally active subjects. This was manifested by reductions in jump height at all time points and jump height asymmetries after the third and fourth sets. These findings indicate that jump height from unilateral jump testing may be a useful metric to use during the monitoring process in recreationally trained athletes.

Item Type: Article
Additional Information: To access the final edited and published work see:
Uncontrolled Keywords: Symmetry, fatigue, sprint decrement, countermovement jump
Subjects: Q Science > QM Human anatomy
Q Science > QP Physiology
Divisions: Departments > Sport and Exercise Sciences
Depositing User: Jason Lake
Date Deposited: 21 Feb 2019 11:04
Last Modified: 06 Mar 2020 01:10

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