在不同温度下检测大鼠快肌和慢肌的力-速度关系。
The force-velocity relation of rat fast- and slow-twitch muscles examined at different temperatures.
作者信息
Ranatunga K W
出版信息
J Physiol. 1984 Jun;351:517-29. doi: 10.1113/jphysiol.1984.sp015260.
Abstract
The steady-state force-velocity relation was examined at temperatures between 35 and 10 degrees C in rat fast-twitch (extensor digitorum longus, e.d.l.) and slow-twitch (soleus) muscle preparations in vitro, with direct stimulation, and employing the isotonic release technique. The curvature of the force-velocity relation increased with cooling in both muscles; the increase was more pronounced below 25 degrees C. The maximum shortening velocity of e.d.l. muscle decreased with a Q10 (temperature coefficient) of 1.8 in cooling from 35 to 25 degrees C; it decreased with a Q10 of 2.4 in cooling below 20 degrees C. The shortening velocity of slow muscle was more temperature sensitive. The Q10 values for soleus muscle were 2.0 at 35-25 degrees C and 3.5 below 20 degrees C. The maximum rate of isometric tetanic tension rise had a temperature sensitivity similar to the maximum velocity of shortening in each muscle type.
摘要
在体外对大鼠快肌（趾长伸肌，e.d.l.）和慢肌（比目鱼肌）肌肉标本进行直接刺激，并采用等张释放技术，在35至10摄氏度之间的温度下研究稳态力-速度关系。在两种肌肉中，力-速度关系的曲率均随冷却而增加；在25摄氏度以下增加更为明显。从35摄氏度冷却至25摄氏度时，e.d.l.肌肉的最大缩短速度以1.8的Q10（温度系数）下降；在冷却至20摄氏度以下时，其以2.4的Q10下降。慢肌的缩短速度对温度更敏感。比目鱼肌在35至25摄氏度时的Q10值为2.0，在20摄氏度以下为3.5。等长强直张力上升的最大速率在每种肌肉类型中的温度敏感性与最大缩短速度相似。
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