针刺镇痛是两种不同感觉传入相互作用的结果。刺激强度与频率是影响这种相互作用的基本因素

研究电针强度与频率对镇痛作用的影响是有重要意义的。关于强度的影响

过去报道的结果很不一致:有的认为电针强度增强

对疼痛反应的抑制效应增大The analgesic effects of "acupuncture" conditioned stimuli of different intensities and frequencies on "pain" test cortical evoked responses were observed in cats under chloralose and flexedil. Within a given stimulus interval (between the conditioned and the test stimulus)

the test evoked responses were inhibited by coditioned stimuli. The inhibitory effects increased with the increase of the intensity of the conditioned stimuli within a given range (1-4 thresholds)

but beyond these range

no matter how high the intensity was

the inhibitory effects remained the same. In case of frequency

when the stimulus interval was fixed

the inhibitory effects decreased with the increase of conditioned stimuli frequency (from 1-20Hz). But within the range of 0.1-1Hz

the inhibitory effects of different frequencies did not show significant difference. The possible mechanism and significance of these phenomena mentioned above were also discussed in this paper.