Hamstrings load bearing in different contraction types and intensities: A shear-wave and B-mode ultrasonographic study.

The main aim was to examine the load bearing of individual hamstring muscles in different contraction types and intensities, through local stiffness measurement by shear wave elastography (SWE). A secondary aim was to examine the relationship between the SWE stiffness measure and hamstrings morpholo...

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Autores principales:	Pavlos E Evangelidis, Xiyao Shan, Shun Otsuka, Chi Yang, Takaki Yamagishi, Yasuo Kawakami
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2da3d27786f5403c978fe039b815e535
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spelling	oai:doaj.org-article:2da3d27786f5403c978fe039b815e5352021-12-02T20:11:17ZHamstrings load bearing in different contraction types and intensities: A shear-wave and B-mode ultrasonographic study.1932-620310.1371/journal.pone.0251939https://doaj.org/article/2da3d27786f5403c978fe039b815e5352021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0251939https://doaj.org/toc/1932-6203The main aim was to examine the load bearing of individual hamstring muscles in different contraction types and intensities, through local stiffness measurement by shear wave elastography (SWE). A secondary aim was to examine the relationship between the SWE stiffness measure and hamstrings morphology. Ten healthy males (age 22.1±4.1 years; height 173.7±5.9 cm; body mass 68.6±12.4 kg; mean ± SD) performed knee flexions on an isokinetic dynamometer at different intensities (20-70%MVC, random order) in three separate, randomized conditions: isometric (ISO), concentric (CON) and eccentric (ECC). SWE was used to measure muscle shear wave velocity (SWV) in biceps femoris long head (BFlh), semitendinosus (ST) and semimembranosus (SM) during contraction. Muscle anatomical cross-sectional area (ACSA) was measured with magnetic resonance imaging and muscle architecture with B-mode ultrasonography. Muscle SWV increased linearly with contraction intensity, but at a varying rate among muscles and contraction types. ST exhibited greater SWV than BFlh and SM in all contraction types, however, there was an upward shift in the SM SWV-torque relationship in ECC compared to ISO and CON. Strong negative correlations were found between peak ISO SWV and ST ACSA (r = -0.81, p = 0.005) and BFlh pennation angle (r = -0.75, p = 0.012). These results suggest that ST has a primary role in hamstrings load bearing in all contraction types, likely due to its morphology; however, there is evidence of increased contribution from SM in eccentric muscle actions.Pavlos E EvangelidisXiyao ShanShun OtsukaChi YangTakaki YamagishiYasuo KawakamiPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 5, p e0251939 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Pavlos E Evangelidis Xiyao Shan Shun Otsuka Chi Yang Takaki Yamagishi Yasuo Kawakami Hamstrings load bearing in different contraction types and intensities: A shear-wave and B-mode ultrasonographic study.
description	The main aim was to examine the load bearing of individual hamstring muscles in different contraction types and intensities, through local stiffness measurement by shear wave elastography (SWE). A secondary aim was to examine the relationship between the SWE stiffness measure and hamstrings morphology. Ten healthy males (age 22.1±4.1 years; height 173.7±5.9 cm; body mass 68.6±12.4 kg; mean ± SD) performed knee flexions on an isokinetic dynamometer at different intensities (20-70%MVC, random order) in three separate, randomized conditions: isometric (ISO), concentric (CON) and eccentric (ECC). SWE was used to measure muscle shear wave velocity (SWV) in biceps femoris long head (BFlh), semitendinosus (ST) and semimembranosus (SM) during contraction. Muscle anatomical cross-sectional area (ACSA) was measured with magnetic resonance imaging and muscle architecture with B-mode ultrasonography. Muscle SWV increased linearly with contraction intensity, but at a varying rate among muscles and contraction types. ST exhibited greater SWV than BFlh and SM in all contraction types, however, there was an upward shift in the SM SWV-torque relationship in ECC compared to ISO and CON. Strong negative correlations were found between peak ISO SWV and ST ACSA (r = -0.81, p = 0.005) and BFlh pennation angle (r = -0.75, p = 0.012). These results suggest that ST has a primary role in hamstrings load bearing in all contraction types, likely due to its morphology; however, there is evidence of increased contribution from SM in eccentric muscle actions.
format	article
author	Pavlos E Evangelidis Xiyao Shan Shun Otsuka Chi Yang Takaki Yamagishi Yasuo Kawakami
author_facet	Pavlos E Evangelidis Xiyao Shan Shun Otsuka Chi Yang Takaki Yamagishi Yasuo Kawakami
author_sort	Pavlos E Evangelidis
title	Hamstrings load bearing in different contraction types and intensities: A shear-wave and B-mode ultrasonographic study.
title_short	Hamstrings load bearing in different contraction types and intensities: A shear-wave and B-mode ultrasonographic study.
title_full	Hamstrings load bearing in different contraction types and intensities: A shear-wave and B-mode ultrasonographic study.
title_fullStr	Hamstrings load bearing in different contraction types and intensities: A shear-wave and B-mode ultrasonographic study.
title_full_unstemmed	Hamstrings load bearing in different contraction types and intensities: A shear-wave and B-mode ultrasonographic study.
title_sort	hamstrings load bearing in different contraction types and intensities: a shear-wave and b-mode ultrasonographic study.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/2da3d27786f5403c978fe039b815e535
work_keys_str_mv	AT pavloseevangelidis hamstringsloadbearingindifferentcontractiontypesandintensitiesashearwaveandbmodeultrasonographicstudy AT xiyaoshan hamstringsloadbearingindifferentcontractiontypesandintensitiesashearwaveandbmodeultrasonographicstudy AT shunotsuka hamstringsloadbearingindifferentcontractiontypesandintensitiesashearwaveandbmodeultrasonographicstudy AT chiyang hamstringsloadbearingindifferentcontractiontypesandintensitiesashearwaveandbmodeultrasonographicstudy AT takakiyamagishi hamstringsloadbearingindifferentcontractiontypesandintensitiesashearwaveandbmodeultrasonographicstudy AT yasuokawakami hamstringsloadbearingindifferentcontractiontypesandintensitiesashearwaveandbmodeultrasonographicstudy
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Hamstrings load bearing in different contraction types and intensities: A shear-wave and B-mode ultrasonographic study.

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