Abstract：
Muscle-tendon power output is commonly assessed in the laboratory through the work loop, a paired analysis of muscle force and length during a cyclic task. Work-loop analysis of muscle-tendon function in out-of-lab conditions has been elusive due to methodological limitations. In this work, we combined kinetic and kinematic measures from shear wave tensiometry and inertial measurement units, respectively, to establish a wearable system for estimating work and power output from the soleus and gastrocnemius muscles during outdoor locomotion. Across 11 healthy young adults, we amassed 4777 strides of walking on slopes from -10° to +10°. Results showed that soleus work scales with incline, while gastrocnemius work is relatively insensitive to incline. These findings agree with previous results from laboratory-based studies while expanding technological capabilities by enabling wearable analysis of muscle-tendon kinetics. Applying this system in additional settings and activities could improve biomechanical knowledge and evaluation of protocols in scenarios such as rehabilitation, device design, athletics, and military training.
摘要：
肌肉-肌腱功率输出通常在实验室中通过工作循环进行评估，循环任务中肌肉力量和长度的配对分析。由于方法学上的限制，在实验室外条件下对肌腱功能进行工作循环分析一直难以捉摸。在这项工作中,我们结合了剪切波张力计和惯性测量单元的动力学和运动学测量，分别,建立一个可穿戴系统，用于估计户外运动期间比目鱼肌和腓肠肌的功和功率输出。在11名健康的年轻人中，我们在-10°到+10°的斜坡上行走了4777步。结果表明，比目鱼的工作尺度倾斜，而腓肠肌工作对倾斜相对不敏感。这些发现与实验室研究的先前结果一致，同时通过对肌腱动力学进行可穿戴分析来扩展技术能力。在其他设置和活动中应用该系统可以改善生物力学知识和方案评估，例如康复，设备设计,田径运动,和军事训练。
