We also talked about the role size plays in motor units, the three phase cycle of muscle twitches, and how the strength and frequency of an impulse affects the strength and duration of a contraction.

我们还讨论了大小在运动单位中的作用，肌肉抽搐的三相周期，以及脉冲的强度和频率如何影响收缩的强度和持续时间。