大鼠肌肉等长收缩中与温度相关的转变
Temperature-dependent transitions in isometric contractions of rat muscle.
作者信息
Ranatunga K W, Wylie S R
出版信息
J Physiol. 1983 Jun;339:87-95. doi: 10.1113/jphysiol.1983.sp014704.
Abstract
The effect of temperature on tetanic tension development was examined in extensor digitorum longus (fast-twitch) and soleus (slow-twitch) muscles of the rat, in vitro and with direct stimulation. The temperature range was from 35 to 10 degrees C. 2. The maximum tetanic tension decreased slightly on cooling from 35 to 25 degrees C. Cooling below 20 degrees C resulted in a marked depression of tetanic tension. The results were similar in the two muscles. 3. Analysis (in the form of Arrhenius plots) of the rate of tetanic tension development and relaxation clearly showed the occurrence of two phases in their temperature dependence, due to an increased temperature sensitivity below about 25 degrees C. Arrhenius activation energy estimates for temperatures lower than 21 degrees C were around twice as high as those for temperatures higher than 24 degrees C in both muscles.
摘要
在体外并通过直接刺激，研究了温度对大鼠趾长伸肌（快肌）和比目鱼肌（慢肌）强直张力发展的影响。温度范围为35至10摄氏度。2. 从35摄氏度冷却至25摄氏度时，最大强直张力略有下降。冷却至20摄氏度以下会导致强直张力显著降低。两块肌肉的结果相似。3. 对强直张力发展和松弛速率的分析（以阿累尼乌斯图的形式）清楚地表明，由于在约25摄氏度以下温度敏感性增加，它们的温度依赖性出现了两个阶段。在两块肌肉中，低于21摄氏度时的阿累尼乌斯活化能估计值约为高于24摄氏度时的两倍。
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