Recruitment order, contractile characteristics, and firing patterns of motor units in the temporalis muscle of monkeys
Recruitment order, contractile characteristics, and firing patterns of motor units in the temporalis muscle of monkeys
复制标题
猴子颞肌运动单位的募集顺序、收缩特征和放电模式
DOI：
10.1016/0014-4886(78)90179-6
复制
发表时间：
1978
影响因子：
5.3
通讯作者：
D. Hoffman
中科院分区：
文献类型：
--
作者：
R. William;E. Luschei;D. Hoffman
在恒河猴的颞肌中记录了单个运动单位的动作电位，这些恒河猴被训练成在咬合杆上保持静力。使用计算机程序确定了许多运动单位的下颌力和运动单位发放率之间的平均关系，并根据该关系确定了运动单位开始开火的阈值力量。研究人员检查了运动单位射击率的几个方面与招募阈值的关系。计算机平均被用来确定许多运动单位的抽动张力和抽动收缩时间。与高阈值运动单位相比，以低力量招募的运动单位有更长的收缩时间，并产生较小的抽搐紧张。与动作电位较大的运动单位相比，动作电位较小的运动单位几乎总是在较低的力量水平下招募。这些结果表明，猕猴颞肌的运动单位被有序地招募，这与大小原理的预测是一致的。
Action potentials of single motor units were recorded in the temporalis muscle of rhesus monkeys trained to hold static forces on a bite bar. The average relationship between mandibular force and motor unit firing rate was determined for many motor units using a computer program, and from this relationship the threshold force at which a motor unit began to fire was determined. Several aspects of motor unit firing rate were examined in relation to recruitment threshold. Computer averaging was used to determine twitch tension and twitch contraction times for many motor units. Motor units recruited at low forces had longer contraction times and produced smaller twitch tensions than higher-threshold motor units. Motor units with small action potentials were nearly always recruited at lower force levels than those with larger action potentials. These results indicate that the motor units of the monkey temporalis muscle were recruited in an orderly fashion, which is in accord with the predictions of the “size principle”.