Which Metrics Can I Monitor? Test-Retest Reliability of Countermovement Jump and Countermovement Rebound Jump Force-Time Metrics in Youth Soccer Players In-Season

Authors

  • Andrew J. Badby Centre for Human Movement and Rehabilitation Science, School of Health and Society, University of Salford, Salford, UK & Hawkin Dynamics, Inc., Westbrook, USA,
  • Paul Comfort Centre for Human Movement and Rehabilitation Science, School of Health and Society, University of Salford, Salford, UK & Strength and Power Research Group, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Australia
  • Nicholas J. Ripley Centre for Human Movement and Rehabilitation Science, School of Health and Society, University of Salford, Salford, UK
  • Matthew Cuthbert Centre for Human Movement and Rehabilitation Science, School of Health and Society, University of Salford, Salford, UK & The FA Group, St George’s Park, Burton-upon-Trent, Staffordshire, UK
  • Francisco J. Robles-Palazón Centre for Human Movement and Rehabilitation Science, School of Health and Society, University of Salford, Salford, UK & Department of Physical Activity and Sport, Faculty of Sport Sciences, Campus of Excellence Mare Nostrum, University of Murcia, Murcia, Spain
  • Peter D. Mundy Hawkin Dynamics, Inc., Westbrook, USA
  • John J. McMahon Centre for Human Movement and Rehabilitation Science, School of Health and Society, University of Salford, Salford, UK & Hawkin Dynamics, Inc., Westbrook, USA

DOI:

https://doi.org/10.47206/ijsc.v5i1.418

Keywords:

Sports Science, Strength and Conditioning, Four Corner Model, Physical Corner, Profiling

Abstract

Objective measures provide the most effective means of monitoring the magnitude and time course of changes in neuromuscular function (NMF) resulting from physical activity if measurements are repeatable (reliability). The aim of this study was to determine the test-retest reliability of a range of ratio, outcome, strategy, and kinetic force plate metrics for the countermovement jump (CMJ) and countermovement rebound jump (CMRJ) tests in youth soccer players in the in-season period. A test-retest repeated-measures design was employed consisting of two testing sessions separated by 7-days. In each testing session, male youth soccer players (N = 43; age 17.9 ± 0.9 years, height 181 ± 5.8 cm, body mass 72.5 ± 6.8 kg) from full-time English Football League academies (categories 2 and 4) performed three maximal-effort CMJs and CMRJs in a randomised order on a Hawkin Dynamics Inc. force plate system sampled at 1000 Hz. Fifteen out of 25 CMJ, 11 out of 19 CMJ portion, and five out of 19 rebound jump (RJ) portion metrics demonstrated acceptable absolute (coefficient of variation [CV] ≤10%) and relative (intraclass correlation coefficient [ICC] ≥0.75) reliability for youth soccer players in the in-season period. The CMJ test is a feasible and reliable slow stretch-shortening cycle (SSC) test which can be utilised for monitoring acute changes in NMF in youth soccer players in-season. Practitioners should consider applying a combination of CMJ outcome, strategy, and kinetic metrics in their monitoring processes. The CMRJ test is a less feasible yet reliable fast SSC test which can be utilised for monitoring acute changes in NMF in youth soccer players in-season and can be considered an appropriate alternative to the drop jump (DJ) test as it overcame issues in DJ fall height variability identified in previous research, where acceptable reliability was demonstrated in CMJ portion bodyweight and all outcome metrics.

Metrics

Metrics Loading ...

Downloads

Published

2025-06-21

Issue

Vol. 5 No. 1 (2025): International Journal of Strength and Conditioning

Section

Articles

License

Copyright (c) 2025 Andrew J. Badby, Paul Comfort, Nicholas J. Ripley, Matthew Cuthbert, Francisco J. Robles-Palazón, Peter D. Mundy, John J. McMahon

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Authors retain copyright of their work, granting IJSC a license to publish and distribute. All articles are distributed under the Creative Commons Attribution 4.0 License. We clearly state any fees associated with submissions or access for readers. For copyright or licensing queries, stakeholders can reach out to journal@iusca.org.

How to Cite

Badby, Andrew, Paul Comfort, Nicholas Ripley, Matthew Cuthbert, Francisco Robles-Palazón, Peter Mundy, and John McMahon. 2025. “Which Metrics Can I Monitor? Test-Retest Reliability of Countermovement Jump and Countermovement Rebound Jump Force-Time Metrics in Youth Soccer Players In-Season”. International Journal of Strength and Conditioning 5 (1). https://doi.org/10.47206/ijsc.v5i1.418.