Rapid hamstrings/quadriceps strength capacity in professional soccer players with different conventional isokinetic muscle strength ratios
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/227005 |
Resumo: | Muscle 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°·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. © Journal of Sports Science and Medicine (2012). |
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Rapid hamstrings/quadriceps strength capacity in professional soccer players with different conventional isokinetic muscle strength ratiosInjuryIsometric actionMuscular torqueMuscle 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°·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. © Journal of Sports Science and Medicine (2012).Human Performance Laboratory UNESP, Av. 24A, 1515, Bela Vista, CEP 13506-900, Rio Claro, SPHuman Performance Laboratory UNESP, Av. 24A, 1515, Bela Vista, CEP 13506-900, Rio Claro, SPUniversidade Estadual Paulista (UNESP)Greco, Camila C. [UNESP]da Silva, Wendell L. [UNESP]Camarda, Sérgio R.A. [UNESP]Denadai, Benedito S. [UNESP]2022-04-29T05:36:43Z2022-04-29T05:36:43Z2012-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article418-422Journal of Sports Science and Medicine, v. 11, n. 3, p. 418-422, 2012.1303-2968http://hdl.handle.net/11449/2270052-s2.0-84867618100Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Sports Science and Medicineinfo:eu-repo/semantics/openAccess2022-04-29T05:36:43Zoai:repositorio.unesp.br:11449/227005Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:26:14.576423Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Rapid hamstrings/quadriceps strength capacity in professional soccer players with different conventional isokinetic muscle strength ratios |
title |
Rapid hamstrings/quadriceps strength capacity in professional soccer players with different conventional isokinetic muscle strength ratios |
spellingShingle |
Rapid hamstrings/quadriceps strength capacity in professional soccer players with different conventional isokinetic muscle strength ratios Greco, Camila C. [UNESP] Injury Isometric action Muscular torque |
title_short |
Rapid hamstrings/quadriceps strength capacity in professional soccer players with different conventional isokinetic muscle strength ratios |
title_full |
Rapid hamstrings/quadriceps strength capacity in professional soccer players with different conventional isokinetic muscle strength ratios |
title_fullStr |
Rapid hamstrings/quadriceps strength capacity in professional soccer players with different conventional isokinetic muscle strength ratios |
title_full_unstemmed |
Rapid hamstrings/quadriceps strength capacity in professional soccer players with different conventional isokinetic muscle strength ratios |
title_sort |
Rapid hamstrings/quadriceps strength capacity in professional soccer players with different conventional isokinetic muscle strength ratios |
author |
Greco, Camila C. [UNESP] |
author_facet |
Greco, Camila C. [UNESP] da Silva, Wendell L. [UNESP] Camarda, Sérgio R.A. [UNESP] Denadai, Benedito S. [UNESP] |
author_role |
author |
author2 |
da Silva, Wendell L. [UNESP] Camarda, Sérgio R.A. [UNESP] Denadai, Benedito S. [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Greco, Camila C. [UNESP] da Silva, Wendell L. [UNESP] Camarda, Sérgio R.A. [UNESP] Denadai, Benedito S. [UNESP] |
dc.subject.por.fl_str_mv |
Injury Isometric action Muscular torque |
topic |
Injury Isometric action Muscular torque |
description |
Muscle 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°·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. © Journal of Sports Science and Medicine (2012). |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-09-01 2022-04-29T05:36:43Z 2022-04-29T05:36:43Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Journal of Sports Science and Medicine, v. 11, n. 3, p. 418-422, 2012. 1303-2968 http://hdl.handle.net/11449/227005 2-s2.0-84867618100 |
identifier_str_mv |
Journal of Sports Science and Medicine, v. 11, n. 3, p. 418-422, 2012. 1303-2968 2-s2.0-84867618100 |
url |
http://hdl.handle.net/11449/227005 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Sports Science and Medicine |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
418-422 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129320404647936 |