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01-06-2020 | Original Article

Effects of jump exercises with and without stretch-shortening cycle actions on components of physical fitness in prepubertal male soccer players

Authors: Raja Bouguezzi, Helmi Chaabene, Yassine Negra, Jason Moran, Senda Sammoud, Rodrigo Ramirez-Campillo, Urs Granacher, Younés Hachana

Published in: Sport Sciences for Health | Issue 2/2020

Abstract

Objective

This study examined the effects of 8-week stretch-shortening cycle-based (SSC-based) versus non-SSC-based jump exercises on physical fitness in prepubertal male soccer players.

Methods

Twenty-six participants were randomly assigned to either a SSC-based using countermovement jump (CMJ_G; n = 13) or a non-SSC-based jump group using squat jump (SJ_G; n = 13). Pre- and post-training, tests were conducted to assess measures of muscle power (countermovement jump, reactive strength index), speed (5 m, 20 m), change of direction (CoD), and sport-specific performance (maximal kicking distance). To establish the effect of the interventions on the dependent variables, a 2 (group: CMJ_G and SJ_G) × 2 (time: pre, post) ANOVA with repeated measures was determined for each parameter.

Results

Findings demonstrated a main effect of time for countermovement jump, reactive strength index, and maximal kicking distance (p < 0.05, effect size [ES] = 0.56–0.71). Group × time interactions were identified for (5 m, 20 m, and reactive strength index (p < 0.05, ES = 0.59–0.64) in favor of CMJ_G. Particularly, pre–post-performance improvements have been observed for 5 m (∆1.6%; p = 0.04; ES = 0.54) and 20 m (∆5.3%; p < 0.01; ES = 1.00) in the CMJ_G. For SJ_G, 5 m (∆− 5.5%; p = 0.01; ES = − 1.12) and 20 m (∆− 3.7%; p = 0.01; ES = − 0.82) pre–post-performance declines were observed. Regarding reactive strength index, pre–post-improvement was noted for CMJ_G only (∆− 40.1%; p < 0.01; ES = 3.7). In addition, a tendency towards a group × time interaction was found for CoD (p = 0.06, ES = 0.54) with a performance decrement for SJ_G (∆− 6.0%; p < 0.01; ES = − 1.8) and no pre–post changes for CMJ_G (∆0.15%; p > 0.05; ES = 0.05).

Conclusion

Overall, jump exercises which utilize the SSC seem to be more effective in improving measures of speed and muscle power performance in young athletes. However, jump exercises that do not involve the SSC appear to negatively affect CoD performance in young athletes.

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Title: Effects of jump exercises with and without stretch-shortening cycle actions on components of physical fitness in prepubertal male soccer players
Authors: Raja Bouguezzi
Helmi Chaabene
Yassine Negra
Jason Moran
Senda Sammoud
Rodrigo Ramirez-Campillo
Urs Granacher
Younés Hachana
Publication date: 01-06-2020
Publisher: Springer Milan
Published in: Sport Sciences for Health / Issue 2/2020
Print ISSN: 1824-7490
Electronic ISSN: 1825-1234
DOI: https://doi.org/10.1007/s11332-019-00605-6

At a glance: The STEP trials

Springer Medicine

Effects of jump exercises with and without stretch-shortening cycle actions on components of physical fitness in prepubertal male soccer players

Abstract

Objective

Methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Objective

Methods

Results

Conclusion

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