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Percentage changes in withdrawal latencies to mechanical (a), cold (b) and thermal stimuli (c) induced by different frequency EA ST36 in conscious LC rats and ZDF rats. Parameters of stimulation: 6 V, 1 ms pulse duration, 3, 10, 30 and 60 Hz for 20 min. ANOVA revealed significant differences of 10 and 30 Hz compared with 3 and 60 Hz EA stimulation (P < .05, n = 10/group).
