A RELIABILITY AND KINETIC ANALYSIS OF THE 10/5 REPEATED JUMP AND DROP JUMP TESTS TO DETERMINE THE USE OF A NOVEL REACTIVE STRENGTH MEASURE: THE REACTIVE QUALITY RATIO

Authors

  • Benjamin M. Southey School of Human Movements and Nutrition Science, The University of Queensland, St Lucia, Queensland, Australia; Brisbane Lions Australian Football Club, Springfield, Queensland, Australia https://orcid.org/0000-0003-1963-8576
  • Mark J. Connick School of Exercise and Nutrition Sciences, Queensland University of Technology, Brisbane, Queensland, Australia
  • Dirk R. Spits Tennis Australia, Tennyson, Queensland, Australia https://orcid.org/0000-0002-0088-2678
  • Damien J. Austin Brisbane Lions Australian Football Club, Springfield, Queensland, Australia
  • Emma M. Beckman School of Human Movements and Nutrition Science, The University of Queensland, St Lucia, Queensland, Australia

Keywords:

reactive strength index, calf complex, biomechanics, strength profiling, jump profiling

Abstract

The stretch-shortening cycle (SSC) plays an important role in locomotion, and tests such as the drop jump (DJ) and 10/5 repeated jump (RJ) are commonly used to determine this through the measure of reactive strength index (RSI). With an understanding that these tests emphasize different jump intensities and strategies, a novel measure called the reactive quality ratio (RQR) has been proposed to determine whether an individual is more dominant in RJ or DJ tasks. Furthermore, comparison of kinetic and temporal outputs of both tests were made during the RQR protocol. Therefore, twenty-four professional Australian footballers completed two testing sessions comprising of both the RJ and DJ test. Results indicated that whilst there was no significant difference in RSI output between RJ and DJ tests respectively (2.52±0.43 vs 2.46±0.38), there were several significant differences in underlying kinetic variables: ground contact time (180±25 vs 209±30ms), flight time (444±53 vs 500±39ms), impulse (524±67 vs 721±69 Ns), average force (2924±363 vs 2624±294N), landing RFD (73226±20555 vs 88159±35922N/s) and active stiffness (43852±11549 vs 32309±12006N/m). Additionally, good levels of reliability were found for RQR (ICC=0.76, CV=2.96%) indicating that this novel measure can be used to determine preferred jump strategy for individuals. Overall, this study confirms underlying differences between RJ and DJ tests.

Keywords: reactive strength index, biomechanics, strength profiling, jump profiling

Downloads

Published

2025-01-02

How to Cite

Southey, B. M., Connick, M. J., Spits, D. R., Austin, D. J., & Beckman, E. M. (2025). A RELIABILITY AND KINETIC ANALYSIS OF THE 10/5 REPEATED JUMP AND DROP JUMP TESTS TO DETERMINE THE USE OF A NOVEL REACTIVE STRENGTH MEASURE: THE REACTIVE QUALITY RATIO. Kinesiology, 56(2), 198–204. Retrieved from https://hrcak.srce.hr/ojs/index.php/kinesiology/article/view/28073

Issue

Vol. 56 No. 2 (2024)

Section

Articles

License

Creative Commons License

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

At Faculty of Kinesiology we recognize that access to quality research is vital to the scientific community and beyond. Kinesiology is non-profit journal and all costs of publishing and peer review process are covered by the publisher itself or other funding sources like Ministry of Science and Education of the Republic of Croatia.   Full text papers are also available free of charge at http://hrcak.srce.hr/kineziologija. There are no restrictions on self archiving of any form of paper (preprint, postprint and publisher's version). 

Articles are distributed under the terms of the CC BY - NC 4.0

Kinesiology does not charge any fees to authors to submit or publish articles in our journal.