Simultaneous Quantification of Ankle, Muscle, and Tendon Impedance in Humans.
Simultaneous Quantification of Ankle, Muscle, and Tendon Impedance in Humans.
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DOI：
10.1109/tbme.2022.3175646
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发表时间：
2022-12
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调节关节的阻抗对于有效地控制姿势和运动是必不可少的。关节的阻抗主要是由跨越它的肌肉肌腱单元的机械特性决定的。许多研究量化了关节的净阻抗，但没有量化肌肉和肌腱的具体贡献。无法量化肌肉和肌腱阻抗限制了确定与衰老、神经肌肉损伤和其他对肌肉和肌腱特性有不同影响的条件相关的运动控制改变的潜在原因的能力。因此，我们开发了一种同时量化关节、肌肉和肌腱阻抗的技术，并在人体脚踝上评估了这种技术。我们使用了一个单一自由度的执行器，在测量相应的扭矩的同时，给踝关节提供伪随机旋转。同时用b超测量腓肠肌内侧-肌腱连接处的位移。从这些实验测量中，我们能够使用非参数系统识别来估计脚踝、肌肉和肌腱的阻抗。我们通过将其与先前报道的肌肉和肌腱刚度（阻抗的位置相关成分）进行比较来验证我们的估计，以证明我们的技术产生了这些特性的可靠估计。我们的方法可以用来阐明肌肉和肌腱对关节净力学的各自贡献。这是了解肌肉和肌腱如何在姿势和运动中控制脚踝阻抗的最终目标的关键一步。
Regulating the impedance of our joints is essential for the effective control of posture and movement. The impedance of a joint is governed mainly by the mechanical properties of the muscle-tendon units spanning it. Many studies have quantified the net impedance of joints but not the specific contributions from the muscles and tendons. The inability to quantify both muscle and tendon impedance limits the ability to determine the causes underlying altered movement control associated with aging, neuromuscular injury, and other conditions that have different effects on muscle and tendon properties. Therefore, we developed a technique to quantify joint, muscle, and tendon impedance simultaneously and evaluated this technique at the human ankle. We used a single degree of freedom actuator to deliver pseudorandom rotations to the ankle while measuring the corresponding torques. We simultaneously measured the displacement of the medial gastrocnemius muscle-tendon junction with B-mode ultrasound. From these experimental measurements, we were able to estimate ankle, muscle, and tendon impedance using non-parametric system identification. We validated our estimates by comparing them to previously reported muscle and tendon stiffness, the position-dependent component of impedance, to demonstrate that our technique generates reliable estimates of these properties. Our approach can be used to clarify the respective contributions from the muscle and tendon to the net mechanics of a joint. This is a critical step forward in the ultimate goal of understanding how muscles and tendons govern ankle impedance during posture and movement.