Holmgren E
Am J Chin Med (Gard City N Y). 1975 Apr;3(2):133-42. doi: 10.1142/s0192415x75000165.
Previous studies have shown that 2 Hz electrical conditioning stimulation of hands and cheeks increased the tooth pain threshold. In the present study the relation between strength of conditioning stimulation and amplitude of pain threshold increase is elucidated. Intense conditioning stimulation, giving subjective beating sensations and extensive muscles twitches, is required to obtain a substantial pain threshold increase. The results are discussed in relation to intensities used in electro-acupuncture and to interindividual variation of the effect. It is suggested that pain relief is obtained due to an inhibitory feed-back mechanism activated, not via low threshold afferents but via high threshold afferents.
先前的研究表明，对手部和脸颊进行2赫兹的电调节刺激可提高牙痛阈值。在本研究中，阐明了调节刺激强度与疼痛阈值增加幅度之间的关系。需要强烈的调节刺激，产生主观的跳动感和广泛的肌肉抽搐，才能使疼痛阈值大幅提高。结合电针治疗中使用的强度以及个体间效应差异对结果进行了讨论。研究表明，疼痛缓解是由于激活了一种抑制性反馈机制，该机制不是通过低阈值传入神经，而是通过高阈值传入神经起作用。
