Stress-strain relationship of individual hamstring muscles: A human cadaver study.

Autor: Nakao G; Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Japan; Sapporo Medical Technology, Welfare and Dentistry Professional Training College of Nishino Gakuen School Foundation, Sapporo, Japan., Kodesho T; Department of Sport Science and Research, Japan Institute of Sports Sciences (JISS), Tokyo, Japan., Yamagata K; Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Japan., Watanabe K; Department of Physical Therapy, School of Health Sciences, Sapporo Medical University, Sapporo, Japan., Ohsaki Y; Department of Anatomy (I), School of Medicine, Sapporo Medical University, Sapporo, Japan., Katayose M; Department of Physical Therapy, School of Health Sciences, Sapporo Medical University, Sapporo, Japan., Taniguchi K; Department of Physical Therapy, School of Health Sciences, Sapporo Medical University, Sapporo, Japan. Electronic address: ktani@sapmed.ac.jp.
Jazyk: angličtina
Zdroj: Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2024 May; Vol. 153, pp. 106473. Date of Electronic Publication: 2024 Feb 28.
DOI: 10.1016/j.jmbbm.2024.106473
Abstrakt: The incidence of hamstring muscle strain varies among muscles, suggesting that the mechanical stresses associated with elongation may differ among muscles. However, the passive mechanical properties of whole human muscles have rarely been directly measured and clarified. This study aimed to clarify the stress-strain relationship of the hamstring muscles using a soft-embalmed Thiel cadaver. The long heads of the biceps femoris (BFlh), semimembranosus (SM), and semitendinosus (ST) muscles were dissected from eight cadavers. The proximal and distal hamstring tendons were affixed to the mechanical testing machine. Slack length was defined as the muscle length at the initial loading point detected upon the application of a tensile load. Muscle length was measured using a tape measure, and the anatomical cross-sectional area (ACSA) of the muscle was measured at the proximal and distal sites using B-mode ultrasonography. In the loading protocol, the muscle was elongated from its slack length to a maximum of 8% strain at an average rate of 0.83 L 0 /s, and the amount of displacement and tensile load were measured for each muscle. Further, the strain (%, displacement/slack muscle length) and stress (kPa, tensile load/ACSA) were calculated to evaluate the mechanical properties. Two-way repeated-measures analysis of variance (ANOVA) was used to compare stress changes with increasing muscle strain. A significant interaction between the muscle and strain factors was observed with respect to stress. Post-hoc tests revealed higher stresses in the BFlh and SM than in ST after 3% strain (P < 0.01). However, no significant differences were observed between the BFlh and SM groups. At 8% strain, the BFlh, SM, and ST exhibited stresses of 63.7 ± 12.1, 53.7 ± 23.2, and 21.0 ± 11.9 kPa, respectively. The results indicate that the stress changes associated with muscle strain differed among muscles. In particular, the stress applied to the three muscles at the same strain was found to be higher in the BFlh and SM. Thus, these findings suggest that increased mechanical stress during elongation may contribute to the frequent occurrence of muscle strain in BFlh and SM.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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