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dc.contributor.authorLloyd, Rhodri S.
dc.contributor.authorOliver, Jon
dc.contributor.authorHughes, Michael G.
dc.contributor.authorWilliams, Craig A.
dc.date.accessioned2013-06-12T12:56:26Z
dc.date.available2013-06-12T12:56:26Z
dc.date.issued2012
dc.identifier.citationLloyd, R.S., Oliver, J.L., Hughes, M.G. and Williams, C.A. (2012) 'The effects of 4-weeks of plyometric training on reactive strength index and leg stiffness in male youths', The Journal of Strength & Conditioning Research, 26(10), pp.2812-2819en_US
dc.identifier.issn1064-8011
dc.identifier.urihttp://hdl.handle.net/10369/4304
dc.description.abstractAlthough previous pediatric research has reported performance improvements in muscular power, agility, speed, and rate-of-force development after exposure to plyometric training, the effects on reactive strength index (RSI) and leg stiffness remain unclear. One hundred and twenty-nine boys from 3 different age groups (9, 12, and 15 years) participated and were divided into either an experimental (EXP) or control (CON) group within their respective age groups. The EXP groups followed a twice-weekly, 4-week plyometric training program, whereas the CON groups participated in their normal physical education lessons. Preintervention and postintervention measures were collected for RSI (during maximal hopping) and leg stiffness (during submaximal hopping). Both 12- and 15-year-old EXP groups made significant improvements in both absolute and relative leg stiffness (p < 0.05). The 9-year-old EXP group and CON groups for all ages did not make significant changes in leg stiffness. The 12-year-old EXP cohort also made significant improvements in RSI (p < 0.05). Both 15- and 9-year-old EXP cohorts, and CON groups for all ages, failed to show any significant improvements in RSI. The study concludes that improvements in RSI and leg stiffness after a 4-week plyometric training program are age dependent during childhood. © 2012 National Strength and Conditioning Association
dc.language.isoenen_US
dc.publisherLippincott, Williams & Wilkins
dc.relation.ispartofseriesJournal of Strength and Conditioning Research Volume;
dc.subjectstretch-shortening cycle
dc.subjectlong-term athlete development
dc.subjectpaediatrics
dc.subjecthopping
dc.titleThe effects of 4-weeks plyometric training on reactive strength index and leg stiffness in male youths.en_US
dc.typeArticleen_US
dc.identifier.doihttp://dx.doi.org/10.1519/JSC.0b013e318242d2ec


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