Cnockaert J C, Goubel F
Eur J Appl Physiol Occup Physiol. 1975 Apr 4;34(2):131-40. doi: 10.1007/BF00999925.
The relationship between the integrated EMG of the biceps (Qs) and positive work (W) was examined for isolated and to and fro movements of the elbow. The movements were performed against either pure inertias or against load. 1. In all cases, a linear QB--W relationship was found. 2. For isolated movements, the QB--W curve showed the same slope whether the movement was carried out against an inertia or against a load. 3. When the movements were carried out against an inertia, the slope of the QB--W curve was steeper for isolated movements than for to and fro ones. These results show that: a) for the movements against a load, the extra component of the integrated EMG arising from the initial isometric phase is compensated by the mechanical work resulting from the release of potential elastic energy; b) for the to and fro movements, elastic energy is stored in the stretched series elastic component during the negative work and released during the positive work. However, in this case, the biceps cannot escape from performing negative work which is necessary to decelerate the extension movement and so, it appears less energy expenditure relatively to the isolated movement.
研究了肱二头肌的积分肌电图（Qs）与正功（W）之间的关系，该研究针对肘部的孤立运动以及来回运动展开。这些运动是在纯惯性或负载条件下进行的。1. 在所有情况下，均发现Qs与W呈线性关系。2. 对于孤立运动，无论运动是在惯性条件下还是负载条件下进行，Qs-W曲线都显示出相同的斜率。3. 当运动在惯性条件下进行时，孤立运动的Qs-W曲线斜率比来回运动的更陡。这些结果表明：a）对于负载运动，初始等长阶段产生的积分肌电图额外成分由潜在弹性能量释放所产生的机械功补偿；b）对于来回运动，弹性能量在负功期间存储在拉伸的串联弹性成分中，并在正功期间释放。然而，在这种情况下，肱二头肌无法避免进行负功，而负功对于减速伸展运动是必要的，因此，相对于孤立运动，其能量消耗似乎较少。
