Optimal reactive strength index: is it an accurate variable to optimize plyometric training effects on measures of physical fitness in young soccer players?
| dc.contributor.author | Ramírez Campillo, Rodrigo | |
| dc.contributor.author | Álvarez, Cristian | |
| dc.contributor.author | García Pinillos, Felipe | |
| dc.contributor.author | Sánchez Sánchez, Javier | |
| dc.contributor.author | Izquierdo Redín, Mikel | |
| dc.contributor.department | Ciencias de la Salud | es_ES |
| dc.contributor.department | Osasun Zientziak | eu |
| dc.date.accessioned | 2020-11-12T13:59:54Z | |
| dc.date.available | 2020-11-12T13:59:54Z | |
| dc.date.issued | 2018 | |
| dc.description.abstract | 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 × 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: −3.1%, d = −0.21; 5RM: 10.5%, d = 0.32) and the OPT group (CMJ: 16.7%, d = 0.76; DJ: 36.1%, d = 0.79; CODA: −4.4%, d = −0.34; 5RM: 18.1%, d = 0.47). Post hoc analyses also revealed increases for the OPT group in 20-m sprint time (−3.7%, 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. | en |
| dc.description.sponsorship | 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). | en |
| dc.format.extent | 21 p. | |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.doi | 10.1519/JSC.0000000000002467 | |
| dc.identifier.issn | 1064-8011 | |
| dc.identifier.uri | https://academica-e.unavarra.es/handle/2454/38625 | |
| dc.language.iso | eng | en |
| dc.publisher | Wolters Kluwer | en |
| dc.relation.ispartof | Journal of Strength and Conditioning Research, 2018, 32(4), 885-893 | en |
| dc.relation.publisherversion | https://doi.org/10.1519/JSC.0000000000002467 | |
| dc.rights | © 2018 National Strength and Conditioning Association | en |
| dc.rights.accessRights | info:eu-repo/semantics/openAccess | |
| dc.subject | Football | en |
| dc.subject | Stretch-shortening cycle | en |
| dc.subject | Maturity | en |
| dc.subject | Training optimization | en |
| dc.subject | Change of direction | en |
| dc.subject | Jumping | en |
| dc.title | Optimal reactive strength index: is it an accurate variable to optimize plyometric training effects on measures of physical fitness in young soccer players? | en |
| dc.type | info:eu-repo/semantics/article | |
| dc.type.version | info:eu-repo/semantics/acceptedVersion | |
| dspace.entity.type | Publication | |
| relation.isAuthorOfPublication | ef73585d-4750-4f56-9d4f-0d759232dbca | |
| relation.isAuthorOfPublication.latestForDiscovery | ef73585d-4750-4f56-9d4f-0d759232dbca |