If a muscle twitch lasts 0.08 s, it first begins to show summation upon repetitive stimulation at a stimulation frequency of
A) 8 Hz
B) 80 Hz
C) 12.5 Hz
D) 125 Hz
E) 1.25 Hz

Question

Quizplus · Accepted Answer

Muscle twitch summation begins when the frequency of stimulation is such that a new twitch starts before the previous one has completely relaxed. Since a twitch lasts 0.08 seconds, the maximum time between twitches to start showing summation is 0.08 seconds. The frequency is the reciprocal of the period (time), so 1 / 0.08 seconds = 12.5 Hz.

If a Muscle Twitch Lasts 0