机械功和机械效率是衡量肌肉收缩能力和整体运动状况的重要指标。测量一块肌肉所做的机械功是容易的。但是,要直接测量一块肌肉,特别是一小块肌肉的机械效率却存在一定的困难。本文介绍一种蟾蜍缝匠肌做功及机械效率的测定方法,并提出肌肉收缩时肌丝分子结构变化的一种设想。实验方法一、实验装置笔者设计了两种测定肌肉做功和做功效率的实验。一种是“密闭循环供氧法”。此法是将肌肉和氧气存放在一个封闭的系 Mechanical work and mechanical efficiency are important indicators of muscle contractility and overall movement. It is easy to measure the mechanical work done by a muscle. However, there are some difficulties in measuring directly the mechanical efficiency of a muscle, especially a small muscle. This article describes a toad sartorius muscle work done and mechanical efficiency of the determination method, and put forward a muscle contraction molecular structure changes in a hypothesis. Experimental methods First, the experimental device I designed two kinds of determination of muscle power and work efficiency experiments. One is the “closed loop oxygen method.” This method is the muscle and oxygen stored in a closed system