Seventeen patients with pain from various causes were treated by Electroacupuncture (n=5), Traditional Chinese Acupuncture (n=4), Transcutaneous Electrical Nerve Stimulation (n=4) or Placebo TENS (n=4). Each treatment lasted 25 minutes. Plasma β-endorphin concentrations were measured before and after the session. Electroacupuncture and Traditional acupuncture treatments were both associated with a significant rise in plasma β-endorphin levels.
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