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dc.contributor.authorGreco, Camila C. [UNESP]
dc.contributor.authorDa Silva, Wendell L. [UNESP]
dc.contributor.authorCamarda, Sergio R. A. [UNESP]
dc.contributor.authorDenadai, Benedito S. [UNESP]
dc.identifier.citationJournal of Sports Science and Medicine. Bursa: Journal Sports Science & Medicine, v. 11, n. 3, p. 418-422, 2012.
dc.description.abstractMuscle strength imbalance can be an important factor in hamstrings muscle strain. A hamstrings/quadriceps (H/Q) strength ratio based on concentric peak torque values (H-con:Q(con)) has traditionally been used to describe the potential for knee-joint destabilization. Because certain standard actions in soccer are explosive, the analysis of the H/Q strength ratio based on the rate of torque development (H-rtd:Q(rtd)) might also be useful in the evaluation of joint stability. The objective of this study was to compare the H-rtd:Q(rtd) between professional soccer players with heterogeneous values of H-con:Q(con). Thirty-nine professional soccer players took part in the following procedures on different days: 1) Familiarization session with the isokinetic dynamometer, and 2) Two maximal isometric actions and five maximal concentric actions at 60 degrees.s(-1) for hamstrings (H) and quadriceps (Q). Participants were ranked according to their H-con:Q(con) ratio. The median third was excluded to form a high torque group (HTG), and a low torque group (LTG). Peak isometric (H) and concentric (H and Q) torques and rate of torque development (H) were significantly greater in the HTG group. Similarly, H-con:Q(con) (0.68 +/- 0.02 vs. 0.52 +/- 0.03) and H-rtd:Q(rtd) (0.54 +/- 0.12 vs. 0.43 +/- 0.16) were significantly greater in the HTG group than in the LTG group. There was no significant correlation between H-con:Q(con) and H-rtd:Q(rtd). It can be concluded that H-con:Q(con) and H-rtd:Q(rtd) are determined, but not fully defined, by shared putative physiological mechanisms. Thus, the physiologic and clinical significance of H-con:Q(con) and H-rtd:Q(rtd) to an athlete's individual evaluation might be different.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipFundação para o Desenvolvimento da UNESP (FUNDUNESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.publisherJournal Sports Science & Medicine
dc.relation.ispartofJournal of Sports Science and Medicine
dc.sourceWeb of Science
dc.subjectMuscular torqueen
dc.subjectisometric actionen
dc.titleRapid hamstrings/quadriceps strength capacity in professional soccer players with different conventional isokinetic muscle strength ratiosen
dcterms.rightsHolderJournal Sports Science & Medicine
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.description.affiliationUNESP, Human Performance Lab, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUnespUNESP, Human Performance Lab, BR-13506900 Rio Claro, SP, Brazil
dc.rights.accessRightsAcesso aberto
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Rio Claropt[4][1][4][1]
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