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Fig. 4. Intensity and frequency dependence of electrical stimulation on muscle-tone suppression. Intensity values (x) were calculated from the actual intensity divided by the threshold intensity. One hundred fifty hertz was used for intensity-dependent, whereas 3 times intensity was used for frequency-dependent studies. The effect of intensity and frequency on muscle-tone suppression was biphasic with the maximal effect at 3 times and 150 Hz, respectively. Contra, contralateral side to the stimulation; ipsi, ipsilateral side to the stimulation.

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