Wells R P
Department of Kinesiology, University of Waterloo, Ontario, Canada.
J Biomech. 1988;21(11):955-64. doi: 10.1016/0021-9290(88)90134-0.
Different methods of calculating the mechanical energy cost of a movement presented in the literature can give results differing by an order of magnitude. The assumptions made concerning the transfer of energy between different parts of the body are part of the problem. This investigation assesses the role of transfer in energy saving and specifically, the possibility of two-joint muscles reducing the mechanical energy cost of a movement compared to a system having one-joint muscles only. An algorithm was developed which recruited one-joint or both one- and two-joint muscles to supply the net joint moments. The work performed under these two conditions was then compared. It was found that activation of both one- and two-joint musculature reduced the mechanical work cost during walking by between 7 and 29% over that required by single-joint musculature alone. This investigation supports suggestions in the literature that one of the functions of two-joint musculature is to reduce the mechanical energy cost and probably the metabolic cost of movement.
文献中提出的计算运动机械能成本的不同方法，其结果可能相差一个数量级。关于身体不同部位之间能量传递的假设是问题的一部分。本研究评估了能量传递在节能中的作用，特别是与仅具有单关节肌肉的系统相比，双关节肌肉降低运动机械能成本的可能性。开发了一种算法，该算法募集单关节或单关节与双关节肌肉来提供净关节力矩。然后比较在这两种条件下所做的功。结果发现，单关节和双关节肌肉组织的激活使步行过程中的机械功成本比仅由单关节肌肉组织所需的成本降低了7%至29%。本研究支持文献中的观点，即双关节肌肉组织的功能之一是降低运动的机械能成本，可能还有代谢成本。
