Farber P L, Tachibana A, Campiglia H M
Acupuncture Research Department, University of São Paulo Medical School, Brazil.
Acupunct Electrother Res. 1997;22(2):109-17. doi: 10.3727/036012997816356725.
Pain thresholds were determined before and after electroacupuncture of the dorsal aspect acupuncture points (AP) of the hand and non acupuncture points (NAP) located 15 mm from the traditional acupuncture points to assess changes in pain threshold thus provoked.
In eight volunteers the pain threshold of specific points was determined before and after acupuncture in the Hegu point (L.I. 4), at the back of the hand. A pressure dolorimeter was used to evaluate pain threshold at the Yangxi (L.I. 5) and Quchi (L.I. 11) points and at sites 15 mm from them. The effects on pain threshold were also measured at Yingxiang (L.I. 20) on both sides.
Before electrostimulation there were no significant differences among the pain thresholds in both AP and NAP. After electrostimulation of the Yangxi point, pain threshold raised from 5.20 kg/sq.cm to 9.20 kg/sq.cm (p < 0.01); acupuncture at Quchi caused the threshold to increase from 5.36 kg/sq.cm to 9.20 kg/sq.cm (p < 0.01) and Yingxiang stimulation changed threshold from 2.63 kg/sq.cm to 3.83 kg/sq.cm (p < 0.051) at the point on the same side and from 2.26 kg/sq.cm to 3.90 kg/sq.cm (p < 0.05) in the opposite side. Before electroacupuncture the pain thresholds at all the tested sites were not statistically different (p > 0.1). After electrostimulation the pain threshold increased 77% at L.I. 5 but went up just 9% and 6% 15 mm from L.I. 5 (p < 0.01); threshold increased by 70% at L.I. 11 but only by 6% and 7% (p < 0.01) 15 mm from L.I. 11.
The pain threshold increased significantly in all tested sites after electroacupuncture but the analgesic effect was predominant in those points lying along the acupuncture meridians.
在手背的背侧穴位（AP）以及距离传统穴位15毫米的非穴位（NAP）进行电针治疗前后测定疼痛阈值，以评估由此引起的疼痛阈值变化。
在8名志愿者中，测定位于手背合谷穴（LI 4）针刺前后特定穴位的疼痛阈值。使用压力痛觉计评估阳溪穴（LI 5）、曲池穴（LI 11）及其旁开15毫米处的疼痛阈值。同时也测量双侧迎香穴（LI 20）对疼痛阈值的影响。
电刺激前，AP和NAP的疼痛阈值之间无显著差异。电刺激阳溪穴后，疼痛阈值从5.20千克/平方厘米升高至9.20千克/平方厘米（p < 0.01）；针刺曲池穴使阈值从5.36千克/平方厘米增加到9.20千克/平方厘米（p < 0.01），刺激迎香穴使同侧穴位的阈值从2.63千克/平方厘米变为3.83千克/平方厘米（p < 0.051），对侧穴位从2.26千克/平方厘米变为3.90千克/平方厘米（p < 0.05）。电针治疗前，所有测试部位的疼痛阈值无统计学差异（p > 0.1）。电刺激后，LI 5处疼痛阈值升高77%，而在LI 5旁开15毫米处仅升高9%和6%（p < 0.01）；LI 11处阈值升高70%，在LI 11旁开15毫米处仅升高6%和7%（p < 0.01）。
电针治疗后所有测试部位的疼痛阈值均显著升高，但镇痛效果在沿经络的穴位中更为显著。
