Abstract
The characteristics of the EMG of Graves' disease is that the dis-tribution of spike discharge becomes more irregular than normal during, voluntary muscle contraction. This irregularity is due to the following 3 factors.
1. The spike discharges of different motor units are apt to approach.
2. The fluctuation of impulse interval of single motor unit becomes remarkable.
3. Mean impulse interval becomes shorter.
This phenomenon shows a tendency of increase or decrease with toxic symptoms, i.e., high basal metabolism, tachycardia and the instability of the pulse.
It is still unknown how this fluctuation occurs in what part of the motor unit. Further study is required.
