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在脚背部/脚下弹运动期间,下腿的肌肉纤维拉伸率

Melissa T Hooijmans¹, Thom T J Veeger², Valentina Mazzoli³

¹Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam Movement Sciences, Amsterdam, The Netherlands.

NMR in biomedicine

|December 8, 2023

概括

这项研究揭示了在背部/腹部屈曲过程中下腿肌肉的循环应变率模式. 这些模式在肌肉和肌肉长度之间有所不同,增加的负载会影响特定的肌肉.

科学领域:

生物医学工程生物医学工程
肌肉骨成像系统的成像
生物力学生物力学

背景情况:

静态MRI量化了肌肉结构,但不是收缩功能损失.
目前的二维相对比MRI (PC-MRI) 在捕捉复杂的三维肌肉运动方面存在局限性.
需要先进的MRI技术来将肌肉结构与功能相关联.

研究的目的:

在动态运动过程中量化三维的肌肉纤维应变率.
为了研究延展率沿着和垂直于肌肉纤维的分布.
评估外部负荷对背部/腹部屈曲过程中的肌肉张力率的影响.

主要方法:

使用时间解析的3D相对比MRI (PC-MRI) 在3特斯拉.
采集的数据具有和没有7.5%的最大自愿收缩负荷.
在七个下腿肌肉中,沿和垂直于肌肉纤维计算了延展率.

主要成果:

在所有研究的肌肉中,沿着和垂直于肌肉纤维确定了循环应变速率模式 (p < 0.0017).
观察到在大多数肌肉中,肌肉长度上的应变速率的异质分布 (p < 0.003).
在额外负荷下发现延伸指长和胃内侧的应变率降低 (p < 0.001).

结论:

下腿肌肉在背部/腹部屈曲过程中表现出循环纤维拉伸率模式.
应变速率模式是肌肉特异的,沿近距离轴变化.
外部负荷会影响特定的下腿肌肉的延展率.

关键词:

在 DTI 中,DTI 是指DTI.通过PC-MRI进行PC-MRI.收缩的功能收缩的功能纤维架构的架构纤维架构.这是骨肌肉的骨架肌肉.

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