Eccentric contraction response of stimulated skeletal muscle fascicle at the various strain rates and stimulation timing

IF 1.9 3区 工程技术 Q3 MECHANICS
Dat Trong Tran, Liren Tsai
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Abstract

Muscle injuries are the most common sports injuries in eccentric contraction. There are many factors that could influence the severity of muscle injuries, including strain, strain rate and stimulation. This study evaluated the interaction of these factors on the biomechanical properties of the muscle–tendon bundle and their role in injuries. A Hopkinson bar system, an MTS machine and an electrical pulse generator were utilized to collect eccentric contraction response data of over 150 frog muscle–tendon samples at strain rates ranging from 0.01 to 300 s−1. The results have shown that the maximum eccentric stress has increased and peaked at the strain rate of about 150 s−1. That peak value has then maintained at the following strain rates. In contrast, Young’s modulus reduced as the strain rate changed from 50 to 300 s−1. That trend was in contrast to unstimulated muscle bundles. In addition, strain rate has significantly influenced stimulated tendon–muscle bundle fracture. Samples tend to rupture at a minor strain of about 3.5% with strain rates over 200 s−1. Because of the increasing stiffness of the muscle area at high strain rates, increased strain in the tendon region resulted in frequent injuries in the tendon area. On the other hand, a maximum stress reduction was detected when the muscle bundles were stimulated at muscle strain greater than 0.2. The results showed that improper timing of stimulation could increase muscle injury. The study shows that the stimulation and strain rate dramatically impact muscle–tendon properties and the risk of injury.

Abstract Image

不同应变率和刺激时间下受刺激骨骼肌筋膜的偏心收缩反应
肌肉损伤是偏心收缩运动中最常见的运动损伤。影响肌肉损伤严重程度的因素有很多,包括应变、应变率和刺激。本研究评估了这些因素对肌肉-肌腱束生物力学特性的相互作用及其在损伤中的作用。研究人员利用霍普金森棒系统、MTS 机和电脉冲发生器收集了 150 多个蛙类肌肉-肌腱样本在 0.01 至 300 s-1 应变速率下的偏心收缩响应数据。结果显示,最大偏心应力在应变率约为 150 s-1 时增加并达到峰值。在随后的应变速率下,该峰值一直保持不变。相反,当应变速率从 50 s-1 变为 300 s-1 时,杨氏模量降低。这一趋势与未受刺激的肌肉束相反。此外,应变速率对刺激肌腱-肌束断裂有显著影响。应变速率超过 200 s-1 时,样本往往会在约 3.5% 的小应变下断裂。由于在高应变率下肌肉区域的硬度增加,肌腱区域的应变增加导致肌腱区域频繁受伤。另一方面,当肌肉应变大于 0.2 时刺激肌束,可检测到最大应力降低。结果表明,刺激时机不当会增加肌肉损伤。这项研究表明,刺激和应变率会极大地影响肌肉肌腱的特性和受伤风险。
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来源期刊
Meccanica
Meccanica 物理-力学
CiteScore
4.70
自引率
3.70%
发文量
151
审稿时长
7 months
期刊介绍: Meccanica focuses on the methodological framework shared by mechanical scientists when addressing theoretical or applied problems. Original papers address various aspects of mechanical and mathematical modeling, of solution, as well as of analysis of system behavior. The journal explores fundamental and applications issues in established areas of mechanics research as well as in emerging fields; contemporary research on general mechanics, solid and structural mechanics, fluid mechanics, and mechanics of machines; interdisciplinary fields between mechanics and other mathematical and engineering sciences; interaction of mechanics with dynamical systems, advanced materials, control and computation; electromechanics; biomechanics. Articles include full length papers; topical overviews; brief notes; discussions and comments on published papers; book reviews; and an international calendar of conferences. Meccanica, the official journal of the Italian Association of Theoretical and Applied Mechanics, was established in 1966.
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