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The 10/5 repeated jumps test : are 10 repetitions and three trials necessary?

Stratford, C; Dos’Santos, T; McMahon, JJ

The 10/5 repeated jumps test : are 10 repetitions and three trials necessary? Thumbnail


Authors

C Stratford

T Dos’Santos



Abstract

The purpose of this study was to identify whether ten repetitions and three trials were necessary to achieve stability in peak reactive strength index (RSI) during the 10/5 repeated jumps test (RJT). Twenty-five males, from multiple sports, performed three trials of the RJT on an in-ground force plate, with 90 seconds’ rest between trials. Intraclass correlation coefficients (ICC = 0.916−0.986) and coefficients of variation (CV ≤ 14.5%) were considered acceptable for all variables. Repeated-measures analysis of variance and Freidman’s tests revealed large and significant differences (p ≤ 0.006, η2 = 0.159−0.434, power ≥ 0.859) in ground contact time (GCT), jump height (JH), and subsequently RSI both between trials and repetitions. Pairwise comparisons revealed that repetitions 1−3 produced longer GCTs (p ≤ 0.05, d = 0.41−1.40), lower JHs (p ≤ 0.05, d = 0.31−0.56), and lower RSI values (p ≤ 0.05, d = 0.35−1.24). The shortest GCTs, greatest JHs and greater RSIs occurred between repetitions 7 and 10, with approximately 60% of peak RSIs occurring during these ranges. The sequential estimate technique revealed that seven repetitions were needed to attain stability in mean peak RSI. Non-significant (p = 0.554) and negligible differences (d ≤ 0.09) in the five best RSIs between trials were noted. One trial of the 10/5 RJT is sufficient to evaluate peak RSI in athletes and should reduce data collection time and fatigue.

Citation

Stratford, C., Dos’Santos, T., & McMahon, J. (2021). The 10/5 repeated jumps test : are 10 repetitions and three trials necessary?. Biomechanics, 1(1), 1-14. https://doi.org/10.3390/biomechanics1010001

Journal Article Type Article
Acceptance Date Nov 25, 2020
Online Publication Date Dec 8, 2020
Publication Date Jan 1, 2021
Deposit Date Dec 10, 2020
Publicly Available Date Dec 10, 2020
Journal Biomechanics
Print ISSN 2673-7078
Publisher MDPI
Volume 1
Issue 1
Pages 1-14
DOI https://doi.org/10.3390/biomechanics1010001
Publisher URL https://doi.org/10.3390/biomechanics1010001
Related Public URLs https://www.mdpi.com/journal/biomechanics
Additional Information Additional Information : ** From MDPI via Jisc Publications Router ** Licence for this article: https://creativecommons.org/licenses/by/4.0/ **Journal IDs: eissn 2673-7078 **History: published 08-12-2020; accepted 25-11-2020

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