Influence of stretch load and pretension on the mechanical efficiency of the quadriceps femoris muscle-tendon unit.

IF 2.2 4区 医学 Q3 PHYSIOLOGY
Bálint Kovács, Örs Sebestyén, Leonidas Petridis, Ye Jingyi, Yang Song, István Kóbor, Yaodong Gu, József Tihanyi
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Abstract

The mechanical efficiency of the quadriceps femoris muscle-tendon unit likely depends on its structural and mechanical properties. Therefore, the purpose of this study was to assess the mechanical efficiency in vivo under various stretch-shortening cycle conditions and to investigate how the morphological and mechanical properties of the quadriceps femoris influence mechanical efficiency.We used MRI to measure quadriceps femoris muscle and tendon morphological properties in young females (n = 9), and we determined mechanical efficiency during stretch-shortening cycle contractions using computer-controlled dynamometer. Testing protocol included contractions with moderate and maximal pretension level and stretching loads of 20 and 100J.Greater mechanical efficiency was associated with larger knee flexion angles and increased positive work under moderate pretension levels with both 20 J (r = 0.67, P = 0.045; r = 0.82, P = 0.007) and 100 J stretch loads (r = 0.87, P = 0.006; r = 0.82, P = 0.007).These findings suggest that lower stretching loads enhance muscle-tendon interaction efficiency by favoring tendon elongation during muscle-tendon unit lengthening, resulting in higher mechanical efficiency. No morphological or mechanical parameter of the muscle-tendon unit were linked to mechanical efficiency, suggesting that efficiency may depend more on muscle activation patterns than on structure.

拉伸负荷和预张力对股四头肌-肌腱单元机械效率的影响。
股四头肌肌腱单元的机械效率可能取决于其结构和机械特性。因此,本研究的目的是评估不同拉伸-缩短周期条件下的体内机械效率,并探讨股四头肌的形态和力学特性对机械效率的影响。我们使用MRI测量年轻女性股四头肌和肌腱形态特征(n = 9),并使用计算机控制的测功仪测定拉伸-缩短周期收缩期间的机械效率。测试方案包括中等和最大预张力水平的收缩和20和100J的拉伸载荷。更高的机械效率与更大的膝关节屈曲角度和在中等预张力水平下增加的正功相关,两者均为20 J (r = 0.67, P = 0.045;r = 0.82, P = 0.007)和100 J拉伸荷载(r = 0.87, P = 0.006;r = 0.82, P = 0.007)。这些发现表明,在肌肉-肌腱单元延长过程中,较低的拉伸负荷有利于肌腱的伸长,从而提高肌肉-肌腱的相互作用效率,从而提高机械效率。肌肉-肌腱单元的形态或力学参数与机械效率无关,这表明效率可能更多地取决于肌肉的激活模式而不是结构。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physiology international
Physiology international Medicine-Physiology (medical)
CiteScore
3.40
自引率
0.00%
发文量
37
期刊介绍: The journal provides a forum for important new research papers written by eminent scientists on experimental medical sciences. Papers reporting on both original work and review articles in the fields of basic and clinical physiology, pathophysiology (from the subcellular organization level up to the oranizmic one), as well as related disciplines, including history of physiological sciences, are accepted.
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