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首页> 外文期刊>Journal of Biomechanics >Muscle force depends on the amount of transversal muscle loading
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Muscle force depends on the amount of transversal muscle loading

机译：肌肉力量取决于横向肌肉的负荷量

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Skeletal muscles are embedded in an environment of other muscles, connective tissue, and bones, which may transfer transversal forces to the muscle tissue, thereby compressing it. In a recent study we demonstrated that transversal loading of a muscle with 1.3Ncm-2 reduces maximum isometric force (Fim) and rate of force development by approximately 5% and 25%, respectively. The aim of the present study was to examine the influence of increasing transversal muscle loading on contraction dynamics.Therefore, we performed isometric experiments on rat M. gastrocnemius medialis (n=9) without and with five different transversal loads corresponding to increasing pressures of 1.3Ncm-2 to 5.3Ncm-2 at the contact area between muscle and load. Muscle loading was induced by a custom-made plunger which was able to move in transversal direction.Increasing transversal muscle loading resulted in an almost linear decrease in muscle force from 4.8±1.8% to 12.8±2% Fim. Compared to an unloaded isometric contraction, rate of force development decreased from 20.2±4.0% at 1.3Ncm-2 muscle loading to 34.6±5.7% at 5.3Ncm-2.Experimental observation of the impact of transversal muscle loading on contraction dynamics may help to better understand muscle tissue properties. Moreover, applying transversal loads to muscles opens a window to analyze three-dimensional muscle force generation. Data presented in this study may be important to develop and validate muscle models which enable simulation of muscle contractions under compression and enlighten the mechanisms behind.
机译：骨骼肌嵌入其他肌肉，结缔组织和骨骼的环境中，这些环境可能将横向力传递到肌肉组织，从而对其进行压缩。在最近的一项研究中，我们证明了1.3Ncm-2的肌肉的横向负荷分别将最大等距力（Fim）和力量发展率分别降低了5％和25％。本研究的目的是研究横向肌肉负荷增加对收缩动力学的影响，因此，我们在没有和有五个不同横向负荷（对应于1.3的增加压力）的大鼠腓肠肌（n = 9）上进行了等距实验Ncm-2至5.3Ncm-2在肌肉和负荷之间的接触区域。通过可沿横向移动的定制柱塞诱导肌肉负荷，增加横向肌肉负荷可使肌肉力从4.8±1.8％降至12.8±2％Fim几乎呈线性下降。与无负荷等距收缩相比，力量发展的速度从1.3Ncm-2肌肉负荷下的20.2±4.0％降低到5.3Ncm-2肌肉负荷下的34.6±5.7％。实验观察横向肌肉负荷对收缩动力学的影响更好地了解肌肉组织特性。此外，向肌肉施加横向载荷会打开一个窗口，以分析三维肌肉力的产生。这项研究中提供的数据对于开发和验证肌肉模型可能非常重要，该模型能够模拟受压情况下的肌肉收缩并启发其背后的机制。

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