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Optimal Reactive Strength Index

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dc.creatorRamirez-Campillo, Rodrigospa
dc.creatorAlvarez, Cristianspa
dc.creatorGarcía-Pinillos, Felipespa
dc.creatorSanchez-Sanchez, Javierspa
dc.creatorYanci, Javierspa
dc.creatorCastillo, Danielspa
dc.creatorLoturco, Irineuspa
dc.creatorChaabene, Helmispa
dc.creatorMoran, Jasonspa
dc.creatorIzquierdo, Mikelspa
dc.date.accessioned2020-06-11T13:21:49Z
dc.date.available2020-06-11T13:21:49Z
dc.date.created2018-04spa
dc.description.abstractThis 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.eng
dc.format.mimetypeapplication/pdf
dc.identifier.doihttps://doi.org/10.1519/jsc.0000000000002467
dc.identifier.issn1064-8011
dc.identifier.issn1533-4287
dc.identifier.urihttps://repository.urosario.edu.co/handle/10336/24919
dc.language.isoeng
dc.publisherThe Journal of Strength and Conditioning Researchspa
dc.relation.citationEndPage893
dc.relation.citationIssueNo. 4
dc.relation.citationStartPage885
dc.relation.citationTitleThe Journal of Strength and Conditioning Research
dc.relation.citationVolumeVol. 32
dc.relation.ispartofThe Journal of Strength and Conditioning Research, ISSN: 1064-8011;1533-4287, Vol.32, No.4 (2018-04); pp. 885-893spa
dc.relation.urihttp://repository.essex.ac.uk/25074/1/Optimal_Reactive_Strength_Index_Is_It_An_Accurate_Variable_To_Optimize_Plyometric_Training_Effects_On_Measures_Of_Physical_Fitness_In_Young_Soccer_Players.pdfspa
dc.rights.accesRightsinfo:eu-repo/semantics/openAccess
dc.rights.accesoAbierto (Texto Completo)spa
dc.source.instnameinstname:Universidad del Rosariospa
dc.source.reponamereponame:Repositorio Institucional EdocURspa
dc.subject.keywordAdolescentspa
dc.subject.keywordAthletic Performancespa
dc.subject.keywordHumansspa
dc.subject.keywordMalespa
dc.subject.keywordMuscle Strengthspa
dc.subject.keywordPhysical Fitnessspa
dc.subject.keywordPlyometric Exercisespa
dc.subject.keywordRunningspa
dc.subject.keywordSoccerspa
dc.titleOptimal Reactive Strength Indexspa
dc.title.TranslatedTitleOPTIMAL REACTIVE STRENGTH INDEX: IS IT AN ACCURATE VARIABLE TO OPTIMIZE PLYOMETRIC TRAINING EFFECTS ON MEASURES OF PHYSICAL FITNESS IN YOUNG SOCCER PLAYERS?eng
dc.typearticleeng
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersion
dc.type.spaArtículospa
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