Moriya M, Miyazaki E
Comp Biochem Physiol A Comp Physiol. 1985;81(3):531-7. doi: 10.1016/0300-9629(85)91021-7.
The longitudinal and circular muscle preparations from guinea pig stomach were compared in their property of shortening. The highest shortening speed was attained only for about 1 sec for longitudinal muscle and about 2 sec for circular muscle from the onset of stimulation in the course of tetanic contraction. Dynamic constants calculated from a force-velocity curve were almost independent of the muscle length, being set near its optimum length. Mean dynamic constants of the longitudinal muscle were: Vmax: 0.205 L/sec, b: 0.056 L/sec, a/Po: 0.292 and that of the circular muscle were: Vmax: 0.576 L/sec, b: 0.056 L/sec, a/Po: 0.107. The difference in Vmax of these muscles are discussed along with the difference in ultrastructure of the contractile filaments.
对豚鼠胃的纵行肌和环行肌标本的缩短特性进行了比较。在强直收缩过程中，从刺激开始起，纵行肌仅在约1秒内达到最高缩短速度，环行肌则在约2秒内达到最高缩短速度。根据力-速度曲线计算出的动力学常数几乎与肌肉长度无关，设定在其最佳长度附近。纵行肌的平均动力学常数为：最大速度（Vmax）：0.205L/秒，b：0.056L/秒，a/Po：0.292；环行肌的平均动力学常数为：Vmax：0.576L/秒，b：0.056L/秒，a/Po：0.107。结合收缩细丝超微结构的差异，对这些肌肉Vmax的差异进行了讨论。
