Repositorio
Institucional

Izquierdo, Mikel

Ramirez-Campillo, Rodrigo#Alvarez, Cristian#Garcia-Pinillos, Felipe#Sanchez-Sanchez, Javier#Yanci, Javier#Castillo, Daniel#Loturco, Irineu#Chaabene, Helmi#Moran, Jason

OPTIMAL REACTIVE STRENGTH INDEX: IS IT AN ACCURATE VARIABLE TO OPTIMIZE PLYOMETRIC TRAINING EFFECTS ON MEASURES OF PHYSICAL FITNESS IN YOUNG SOCCER PLAYERS?

LIPPINCOTT WILLIAMS & WILKINS

JOURNAL OF STRENGTH AND CONDITIONING RESEARCH

en

This study aimed to compare the effects of drop-jump training using a fixed drop-box height (i.e., 30-cm [FIXED]) vs. an optimal (OPT) drop-box height (i.e., 10-cm to 40-cm: generating an OPT reactive strength index [RSI]) in youth soccer players' physical fitness. Athletes were randomly allocated to a control group (n = 24, age = 13.7 years), a fixed drop-box height group (FIXED, n = 25, age = 13.9 years), or an OPT drop-box height group (OPT, n = 24, age = 13.1 years). Before and after 7 weeks of training, tests for the assessment of jumping (countermovement jump [CMJ], 5 multiple bounds), speed (20-m sprint time), change of direction ability (CODA [Illinois test]), strength {RSI and 5 maximal squat repetition test (5 repetition maximum [RM])}, endurance (2.4-km time trial), and kicking ability (maximal kicking distance) were undertaken. Analyses revealed main effects of time for all dependent variables (p < 0.001, d = 0.24-0.72), except for 20-m sprint time. Analyses also revealed group 3 time interactions for CMJ (p, 0.001, d = 0.51), depth jump (DJ) (p < 0.001, d = 0.30), 20-m sprint time (p < 0.001, d = 0.25), CODA (p < 0.001, d = 0.22), and 5RM (p < 0.01, d = 0.16). Post hoc analyses revealed increases for the FIXED group (CMJ: 7.4%, d = 0.36, DJ: 19.2%, d = 0.49, CODA: 23.1%, d = 20.21, 5RM: 10.5%, d = 0.32) and the OPT group (CMJ: 16.7%, d = 0.76, DJ: 36.1%, d = 0.79, CODA: 24.4%, d = 20.34, 5RM: 18.1%, d = 0.47). Post hoc analyses also revealed increases for the OPT group in 20-m sprint time (23.7%, d = 0.27). Therefore, to maximize the effects of plyometric training, an OPT approach is recommended. However, using adequate fixed drop-box heights may provide a rational and practical alternative.

Artículo original

The authors thank all the athletes who volunteered to participate in the study and those who collaborated with data collection. The authors disclose funding received for this work from any of the following organizations: National Institutes of Health (NIH), Welcome Trust, Howard Hughes Medical Institute (HHMI), and other(s). The authors of this article state that the results of this study do not constitute endorsement of the product by the authors or the National Strength and Conditioning Association.

Los autores agradecen a todos los atletas que se ofrecieron como voluntarios para participar en el estudio y a quienes colaboraron en la recopilación de datos. Los autores declaran haber recibido financiación para este trabajo de cualquiera de las siguientes organizaciones: Institutos Nacionales de la Salud (NIH), Welcome Trust, Instituto Médico Howard Hughes (HHMI) y otras. Los autores de este artículo declaran que los resultados de este estudio no constituyen un respaldo del producto por parte de los autores ni de la Asociación Nacional de Fuerza y ​​Acondicionamiento.

10.1519/JSC.0000000000002467

pdf

football# stretch-shortening cycle# maturity# training optimization# change of direction# jumping

http://dx.doi.org/10.1519/JSC.0000000000002467

Sport Sciences

fútbol americano# ciclo de estiramiento-acortamiento# madurez# optimización del entrenamiento# cambio de dirección# saltando

Ciencias del Deporte y Acondicionamiento Físico

Fisiología

WOS:000431392300002

OPTIMAL REACTIVE STRENGTH INDEX: IS IT AN ACCURATE VARIABLE TO OPTIMIZE PLYOMETRIC TRAINING EFFECTS ON MEASURES OF PHYSICAL FITNESS IN YOUNG SOCCER PLAYERS?

Artículo original

version publicada

LIPPINCOTT WILLIAMS & WILKINS

JOURNAL OF STRENGTH AND CONDITIONING RESEARCH

Ciencias del Deporte

1064-8011

en

NIH#Welcome Trust#Howard Hughes Medical Institute (HHMI)

NIH

Welcome Trust

Howard Hughes Medical Institute (HHMI)

The authors thank all the athletes who volunteered to participate in the study and those who collaborated with data collection. The authors disclose funding received for this work from any of the following organizations: National Institutes of Health (NIH), Welcome Trust, Howard Hughes Medical Institute (HHMI), and other(s). The authors of this article state that the results of this study do not constitute endorsement of the product by the authors or the National Strength and Conditioning Association.

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