Lasers in Medical Science

, Volume 22, Issue 1, pp 37–41 | Cite as

High-intensity laser for acupuncture-like stimulation

  • J. L. Zeredo
  • K. M. Sasaki
  • K. Toda
Original article


The insertion of needles into specific parts of the body was shown to provide analgesic and therapeutic effects. In this study, we tested the analgesic effects of high-intensity infrared laser for acupuncture-like stimulation. Twelve adult Sprague–Dawley rats weighing 230 to 250 g were randomly assigned to laser, needle, or restraint groups. Stimulation was directed to the meridian point Taixi (KI 3) for 10 min. For laser stimulation, a pulsed Er:YAG system was used. The laser settings were adjusted to provide a focal raise in the skin temperature to about 45°C. The anti-nociceptive effect was evaluated by the tail-flick test. Both needling and laser stimulation significantly increased the tail-flick latency. Peak needling effect was observed immediately after treatment, while laser stimulation was effective both immediately and 45 min after treatment. High-intensity laser stimulation may be used alternatively or in combination with conventional acupuncture needling for pain relief.


Lasers Acupuncture Analgesia Rats 



This study was presented in part at the 11th World Congress on Pain (Sydney, Australia), 2005. It was supported by a grant-in-aid for Scientific Research from JSPS (No. P05242). KMS is a JSPS postdoctoral fellow.


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Copyright information

© Springer-Verlag London Limited 2006

Authors and Affiliations

  1. 1.Division of Integrative Sensory Physiology, Department of Developmental and Reconstructive MedicineGraduate School of Biomedical Sciences, Nagasaki UniversityNagasakiJapan

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