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核心技术专利：CN118964589B侵权必究

核心技术专利：CN118964589B侵权必究

Petit J, Chua M, Hunt C C

Department of Neurology, Washington University School of Medicine, St. Louis, Missouri 63110.

J Neurophysiol. 1993 Feb;69(2):442-8. doi: 10.1152/jn.1993.69.2.442.

Isotonic shortening of cat superficial lumbrical muscles was studied during maximal tetanic contractions of single motor units of identified types. For each motor unit, the maximal speed of contraction, Vmax, was determined by extrapolating to zero the hyperbolic relation between applied tension and speed of shortening. 2. The maximal speeds of shortening of motor units formed a continuum with the highest velocities observed for the fast fatigable motor units and the lowest for the slow motor units. 3. On average, the maximum speed of shortening increased with the tetanic tension developed by the motor units. 4. In motor units with isometric twitch contraction times less than 35 ms, these times showed a significant inverse correlation with Vmax. Progressively longer contraction times were associated with rather small changes in Vmax. 5. The implications of these findings on the speed of muscle shortening during motor-unit recruitment are discussed.

在已确定类型的单个运动单位进行最大强直收缩期间，对猫的浅蚓状肌的等张收缩进行了研究。对于每个运动单位，通过将施加的张力与缩短速度之间的双曲线关系外推至零来确定最大收缩速度Vmax。2. 运动单位的最大缩短速度形成一个连续体，快速易疲劳运动单位的速度最高，而慢速运动单位的速度最低。3. 平均而言，最大缩短速度随着运动单位产生的强直张力而增加。4. 在等长单收缩时间小于35毫秒的运动单位中，这些时间与Vmax呈显著负相关。收缩时间逐渐延长与Vmax的变化较小相关。5. 讨论了这些发现对运动单位募集期间肌肉缩短速度的影响。

Petit J, Chua M, Hunt C C

Department of Neurology, Washington University School of Medicine, St. Louis, Missouri 63110.

J Neurophysiol. 1993 Feb;69(2):442-8. doi: 10.1152/jn.1993.69.2.442.

Isotonic shortening of cat superficial lumbrical muscles was studied during maximal tetanic contractions of single motor units of identified types. For each motor unit, the maximal speed of contraction, Vmax, was determined by extrapolating to zero the hyperbolic relation between applied tension and speed of shortening. 2. The maximal speeds of shortening of motor units formed a continuum with the highest velocities observed for the fast fatigable motor units and the lowest for the slow motor units. 3. On average, the maximum speed of shortening increased with the tetanic tension developed by the motor units. 4. In motor units with isometric twitch contraction times less than 35 ms, these times showed a significant inverse correlation with Vmax. Progressively longer contraction times were associated with rather small changes in Vmax. 5. The implications of these findings on the speed of muscle shortening during motor-unit recruitment are discussed.

在已确定类型的单个运动单位进行最大强直收缩期间，对猫的浅蚓状肌的等张收缩进行了研究。对于每个运动单位，通过将施加的张力与缩短速度之间的双曲线关系外推至零来确定最大收缩速度Vmax。2. 运动单位的最大缩短速度形成一个连续体，快速易疲劳运动单位的速度最高，而慢速运动单位的速度最低。3. 平均而言，最大缩短速度随着运动单位产生的强直张力而增加。4. 在等长单收缩时间小于35毫秒的运动单位中，这些时间与Vmax呈显著负相关。收缩时间逐渐延长与Vmax的变化较小相关。5. 讨论了这些发现对运动单位募集期间肌肉缩短速度的影响。