Relationships between Changes in Muscle Shear Modulus, Urinary Titin N- Terminal Fragment, and Maximum Voluntary Contraction Torque after Eccentric Exercise of the Elbow Flexors.

IF 2.4 2区 医学 Q2 SPORT SCIENCES Journal of Sports Science and Medicine Pub Date : 2023-12-01 DOI:10.52082/jssm.2024.797
Takayuki Inami, Shota Yamaguchi, Takuya Nishioka, Hiroyuki Ishida, Akihisa Morito, Satoshi Yamada, Naoya Nagata, Mitsuyoshi Murayama
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Abstract

The study aimed to investigate the relationships between the shear modulus of the biceps brachii (BB) and brachialis muscle (BA) and the total of the two (BB+BA), and urinary titin N-terminal fragment (UTF), maximum voluntary isometric contraction (MVC), and other indirect markers. Fifteen healthy men performed five sets of 10 eccentric contractions using a dumbbell corresponding to 50% of MVC at 90° measured at baseline. The elbow joint of the left arm was extended from 90° to 180° (180° = full extension) in 5 s in the exercise, and was returned with support from the examiner to prevent concentric contraction. Shear modulus of BB and BA were measured by ultrasound shear wave elastography, and UTF, MVC, and range of motion of the elbow joint (ROM) were recorded before; immediately after; and 1, 24, 48, 72, 96, and 168 h after the exercise. After calculating the shear modulus of BB and BA, two values were added (BB+BA). The shear modulus peaked at 48 h, UTF peaked at 96 h, MVC and ROM changed largest at immediately, and muscle soreness peaked at 48 h post-exercise. Significant (p < 0.05) relationships were found between changes in BB shear modulus and BA shear modulus (r = 0.874), BB+BA shear modulus (r = 0.977), UTF (r = 0.681), and MVC (r = -0.538). Significant (p < 0.05) relationships were also observed between changes in BA shear modulus and BB+BA shear modulus (r = 0.957), UTF (r = 0.682), MVC (r = -0.522), and ROM (r = -0.600). Moreover, significant (p < 0.05) relationships were observed between changes in BB+BA shear modulus and UTF (r = 0.703), MVC (r = -0.549), and ROM (r = -0.547). These results indicate that shear modulus of each muscle (i.e., BB and BA) provide more precise information about muscle damage than UTF, MVC and ROM.

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肘关节屈肌偏心运动后肌肉剪切模量、尿Titin N-末端片段变化与最大自主收缩扭矩的关系。
本研究旨在探讨肱二头肌(BB)和肱肌(BA)的剪切模量及其两者之和(BB+BA)与尿titin n端片段(UTF)、最大自主等距收缩(MVC)等间接指标之间的关系。15名健康男性使用哑铃进行5组10次偏心收缩,对应于基线测量的MVC在90°时的50%。练习中,左臂肘关节在5 s内由90°伸展至180°(180°=完全伸展),在检查者的支撑下复位,防止同心圆收缩。采用超声剪切波弹性仪测量BB和BA的剪切模量,并记录UTF、MVC和肘关节活动度(ROM);后立即;练习后1、24、48、72、96、168小时。计算出BB和BA的剪切模量后,加两个值(BB+BA)。剪切模量在48 h达到峰值,UTF在96 h达到峰值,MVC和ROM在运动后瞬间变化最大,肌肉酸痛在运动后48 h达到峰值。BB剪切模量与BA剪切模量变化(r = 0.874)、BB+BA剪切模量变化(r = 0.977)、UTF变化(r = 0.681)、MVC变化(r = -0.538)之间存在显著相关性(p < 0.05)。BA剪切模量与BB+BA剪切模量的变化(r = 0.957)、UTF (r = 0.682)、MVC (r = -0.522)、ROM (r = -0.600)之间也存在显著相关(p < 0.05)。此外,BB+BA剪切模量的变化与UTF (r = 0.703)、MVC (r = -0.549)和ROM (r = -0.547)之间存在显著关系(p < 0.05)。这些结果表明,每块肌肉的剪切模量(即BB和BA)比UTF、MVC和ROM提供了更精确的肌肉损伤信息。
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来源期刊
CiteScore
5.60
自引率
6.20%
发文量
56
审稿时长
4-8 weeks
期刊介绍: The Journal of Sports Science and Medicine (JSSM) is a non-profit making scientific electronic journal, publishing research and review articles, together with case studies, in the fields of sports medicine and the exercise sciences. JSSM is published quarterly in March, June, September and December. JSSM also publishes editorials, a "letter to the editor" section, abstracts from international and national congresses, panel meetings, conferences and symposia, and can function as an open discussion forum on significant issues of current interest.
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