青蛙骨骼肌快速缩短所释放的额外能量对缩短程度的依赖性。
The dependence on extent of shortening of the extra energy liberated by rapidly shortening frog skeletal muscle.
作者信息
Irving M, Woledge R C
出版信息
J Physiol. 1981 Dec;321:411-22. doi: 10.1113/jphysiol.1981.sp013993.
Abstract
- Pairs of frog sartorius muscles were stimulated for 2 sec at 0 degrees C, after 1 sec of isometric contraction, were released at a constant velocity. The total excess heat (shortening heat) and work associated with the release were determined by comparison with isometric control tetani. 2. Shortening heat and work production were non-linearly related to the distance shortened. There was proportionally more energy liberation for smaller releases. 3. The dependence of shortening heat on muscle length was investigated within the sarcomere length range 2.1--2.6 micrometer (as measured in resting muscle) and was found to be similar to that of isometric tension. 4. A simple model in which heat and work are produced in a two-state cycle can describe these and previous results concerning the energetics of rapidly shortening muscle.
摘要
- 将成对的青蛙缝匠肌在0摄氏度下刺激2秒，等长收缩1秒后，以恒定速度放松。通过与等长对照强直收缩相比较，确定与放松相关的总多余热量（缩短热）和功。2. 缩短热和功的产生与缩短距离呈非线性关系。较小的缩短量会按比例释放更多能量。3. 在肌节长度范围2.1 - 2.6微米（在静息肌肉中测量）内研究了缩短热对肌肉长度的依赖性，发现其与等长张力的依赖性相似。4. 一个在双态循环中产生热量和功的简单模型可以描述这些以及先前关于快速缩短肌肉能量学的结果。
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