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

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

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