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Shear elastic modulus is a reproducible index reflecting the passive mechanical properties of medial gastrocnemius muscle belly

BACKGROUND: Passive mechanical properties are important in muscle function because they are related to the muscle extensibility. Recently, the assessment of muscle shear elastic modulus using shear-wave elastographic (SWE) imaging was developed. However, reliability and validity of shear elastic mod...

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Detalles Bibliográficos
Autores principales: Nakamura, Masatoshi, Ikezoe, Tome, Umegaki, Hiroki, Kobayashi, Takuya, Nishisita, Satoru, Ichihashi, Noriaki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: SAGE Publications 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4853831/
https://www.ncbi.nlm.nih.gov/pubmed/27170845
http://dx.doi.org/10.1177/2058460115604009
Descripción
Sumario:BACKGROUND: Passive mechanical properties are important in muscle function because they are related to the muscle extensibility. Recently, the assessment of muscle shear elastic modulus using shear-wave elastographic (SWE) imaging was developed. However, reliability and validity of shear elastic modulus measurements during passive stretching remain undefined. PURPOSE: To investigate the reproducibility and validity of the shear elastic modulus measured by SWE imaging during passive stretching. MATERIAL AND METHODS: Ten healthy men volunteered for this study. The shear elastic modulus of medial gastrocnemius (MG) muscle belly was measured using ultrasonic SWE imaging during passive dorsiflexion. To assess the intra-session and inter-day reliabilities, the protocol was performed twice by the same investigator with a 5-min rest period between measurement sessions and twice on two different days by the same investigator with a 1–2-week interval between the two sessions. To assess the inter-investigator reliability, the protocol was performed on the same day by two investigators with a 5-min rest between measurement sessions. In addition, B-mode ultrasonography was used to determine the displacement of myotendinous junction (MTJ) of MG during passive ankle dorsiflexion. RESULTS: The intra-session, inter-day, and inter-investigator reliabilities of the method was confirmed on the basis of acceptably low coefficient of variations and substantially high intraclass correlation coefficients. In addition, a significant correlation was found between MTJ displacement and shear elastic modulus. CONCLUSION: These results suggested that shear elastic modulus measured using SWE imaging is a reproducible index reflecting the passive mechanical properties.