Does acupuncture needling induce analgesic effects comparable to diffuse noxious inhibitory controls?

Schliessbach, Juerg; van der Klift, Eveline; Siegenthaler, Andreas; Arendt-Nielsen, Lars; Curatolo, Michele; Streitberger, Konrad (2012). Does acupuncture needling induce analgesic effects comparable to diffuse noxious inhibitory controls? Evidence-based complementary and alternative medicine eCAM, 2012, p. 785613. New York, N.Y.: Hindawi 10.1155/2012/785613

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Diffuse noxious inhibitory control (DNIC) is described as one possible mechanism of acupuncture analgesia. This study investigated the analgesic effect of acupuncture without stimulation compared to nonpenetrating sham acupuncture (NPSA) and cold-pressor-induced DNIC. Forty-five subjects received each of the three interventions in a randomized order. The analgesic effect was measured using pressure algometry at the second toe before and after each of the interventions. Pressure pain detection threshold (PPDT) rose from 299 kPa (SD 112 kPa) to 364 kPa (SD 144), 353 kPa (SD 135), and 467 kPa (SD 168) after acupuncture, NPSA, and DNIC test, respectively. There was no statistically significant difference between acupuncture and NPSA at any time, but a significantly higher increase of PPDT in the DNIC test compared to acupuncture and NPSA. PPDT decreased after the DNIC test, whereas it remained stable after acupuncture and NPSA. Acupuncture needling at low pain stimulus intensity showed a small analgesic effect which did not significantly differ from placebo response and was significantly less than a DNIC-like effect of a painful noninvasive stimulus.

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