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Differential effects of variable frequencies of manual acupuncture at ST36 in rats with atropine-induced inhibition of gastric motility
  1. Li-Li Gao1,
  2. Yi Guo1,
  3. Tao Sha1,
  4. Yang-Yang Liu1,
  5. Jia-Bei Tang2,
  6. Fang Yuan3,
  7. Tao Zhou4,
  8. Shou-Hai Hong1,
  9. Dong Ming2
  1. 1College of Acupuncture and Massage, Tianjin University of Traditional Chinese Medicine, Tianjin, China
  2. 2School of Precision Instruments & Optoelectronics Engineering, Tianjin University, Tianjin, China
  3. 3Acupuncture Department, Shenzhen Traditional Chinese Medicine Hospital, Shenzhen, China
  4. 4Department of Physiology, College of Integrated Traditional and Western Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
  1. Correspondence to Yang-Yang Liu, College of Acupuncture and Moxibustion, Tianjin University of Traditional Chinese Medicine, No. 312, Anshan West Road, Nankai District, Tianjin 300193, China; lyy02211{at}163.com

Abstract

Objective The ‘intensity-response’ relationship between acupuncture stimulation and therapeutic effect is currently the focus of much research interest. The same needling manipulation with different frequencies can generate differential levels of stimulus. This study aimed to examine the effects on gastric motility induced by four twirling frequencies based on relatively standardised manual acupuncture (MA) manipulations.

Methods Twirling manipulations at 1, 2, 3, and 4 Hz were practised before the experiments by a single operator using an MA parameter measurement device and stability was evaluated through time-frequency analysis. Forty-eight Sprague-Dawley rats were randomly divided into six groups (n=8 each): Control, Model, Model+MA (1, 2, 3, and 4 Hz). Rats in the five Model groups received injections of atropine into the tail vein to inhibit gastric motility, which was continuously recorded by a balloon in the gastric antrum. Rats in the four Model+MA groups received MA at 1, 2, 3 and 4 Hz, respectively, for 70 s and needles were retained for a further 5 min.

Results The amplitude of waveforms produced by the four twirling frequencies was relatively consistent and reproducible. The gastric motility amplitude in all groups decreased after modelling (injections of atropine) (p<0.01). Twirling manipulation at 1, 2, and 3 Hz (but not 4 Hz) increased gastric motility amplitude (p<0.05). The increase in gastric motility amplitude induced by MA at 2 Hz was greater than for all other frequencies (p<0.05).

Conclusions Acupuncture at ST36 helped recover gastric motility amplitude in rats with atropine-induced gastric inhibition and the effects induced by 1–3 Hz frequency were greater than those induced by 4 Hz.

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