Gauging force by tapping tendons.
Gauging force by tapping tendons.
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DOI：
10.1038/s41467-018-03797-6
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发表时间：
2018-04-23
影响因子：
16.6
通讯作者：
Thelen DG
中科院分区：
文献类型：
--
作者：
Martin JA;Brandon SCE;Keuler EM;Hermus JR;Ehlers AC;Segalman DJ;Allen MS;Thelen DG
肌肉是驱动人类运动的致动器。然而，尽管进行了几十年的研究，我们仍然不能轻易地评估肌肉在人类运动中传递的力量。肌肉-肌腱负荷的直接测量是有创的，建模方法需要许多假设。在这里，我们介绍了一种通过跟踪振动行为来评估肌腱负荷的非侵入性方法。我们首先证明了剪切波在肌腱中的传播速度随轴向应力的平方根而增大。然后，我们介绍了一种非常简单的剪切波张力计，它使用微米级的抽头和皮肤安装的加速计来跟踪体内肌腱的波速。肌腱的波速与等长运动、行走和跑步时的主动关节力矩同步。这种非侵入性评估肌腱负荷的能力可以为运动控制和潜在的生物力学提供新的见解，并可能导致加强肌肉骨骼损伤和疾病的临床治疗。如果没有侵入性的方法，在运动过程中施加在肌腱上的机械力是很难测量的。在这里，作者开发了一种非侵入性的可穿戴设备，通过测量剪切波的传播速度来跟踪肌腱负载，并演示了它在动态人体运动中的应用。
Muscles are the actuators that drive human movement. However, despite many decades of work, we still cannot readily assess the forces that muscles transmit during human movement. Direct measurements of muscle–tendon loads are invasive and modeling approaches require many assumptions. Here, we introduce a non-invasive approach to assess tendon loads by tracking vibrational behavior. We first show that the speed of shear wave propagation in tendon increases with the square root of axial stress. We then introduce a remarkably simple shear wave tensiometer that uses micron-scale taps and skin-mounted accelerometers to track tendon wave speeds in vivo. Tendon wave speeds are shown to modulate in phase with active joint torques during isometric exertions, walking, and running. The capacity to non-invasively assess muscle–tendon loading can provide new insights into the motor control and biomechanics underlying movement, and could lead to enhanced clinical treatment of musculoskeletal injuries and diseases. Mechanical forces exerted on tendons during locomotion cannot be readily measured without invasive methods. Here, the authors develop a non-invasive wearable device to track tendon loads by measuring shear wave propagation speed, and demonstrate its use during dynamic human movements.