Blagrove et al 2018 JSAMS Efficacy of DJ to elicit post-activation performance enhancement in junior runners.pdf (664.75 kB)

Efficacy of depth jumps to elicit a post-activation performance enhancement in junior endurance runners

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journal contribution
posted on 01.07.2019 by Richard C. Blagrove, Kristina M. Holding, Stephen D. Patterson, Glyn Howatson, Philip R. Hayes
Objectives: To determine the effect of performing depth jumps (DJ) pre-exercise on running economy (RE) and time to exhaustion (TTE) at the speed associated with maximal oxygen uptake (sV˙O2max) in a group of high-performing junior middle-distance runners. Design: Randomized crossover study. Methods: Seventeen national- and international-standard male distance runners (17.6 ± 1.2 years, 63.4 ± 6.3 kg, 1.76 ± 0.06 m, 70.7 ± 5.2 mL kg−1 min−1) completed two trials. Following a 5 min warm-up at 60% V˙O2max, participants performed a 5 min run at 20%Δ below oxygen uptake corresponding with lactate turn-point to determine pre-intervention RE. Participants then completed either six DJ from a box equivalent to their best counter-movement jump (CMJ) or a control condition (C) involving body weight quarter squats. After a 10 min passive recovery, another 5 min sub-maximal run was performed followed by a run to exhaustion at sV˙O2max. Results: Compared to the C trial, DJ produced moderate improvements (−3.7%, 95% confidence interval for effect size: 0.25–1.09) in RE, which within the context of minimal detectable change is considered possibly beneficial. Differences in TTE and other physiological variables were most likely trivial (ES: <0.2). Individual responses were small, however a partial correlation revealed a moderate relationship (r = −0.55, p = 0.028) between change in RE and CMJ height. Conclusions: The inclusion of a set of six DJ in the warm-up routine of a well-trained young male middle-distance runner is likely to provide a moderate improvement in RE.

History

School

  • Sport, Exercise and Health Sciences

Published in

Journal of Science and Medicine in Sport

Volume

22

Issue

2

Pages

239 - 244

Citation

BLAGROVE, R.C. ... et al, 2019. Efficacy of depth jumps to elicit a post-activation performance enhancement in junior endurance runners. Journal of Science and Medicine in Sport, 22 (2), pp.239-244.

Publisher

Elsevier © Sports Medicine Australia

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Journal of Science and Medicine in Sport and the definitive published version is available at https://doi.org/10.1016/j.jsams.2018.07.023

Publication date

2018-08-03

ISSN

1440-2440

Language

en

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