We demonstrated a 50% increase in pain threshold following laser photobiostimulation (LPBS), employing rat tail-flick test. Helium-neon laser (1 mW) of three different pulsing frequencies (4, 60, and 200 Hz) was applied on tail low resistance point for 15 seconds and tail-flick latencies were measured 30 minutes, 1 hour, 24 hours, 48 hours and 7 days later. LPBS of 4 Hz produced hypoalgesia of rapid onset and short duration while the response to 60 Hz was delayed and lasted longer. LPBS of 200 Hz did not produce any hypoalgesia.
WalkerJ, Relief from chronic pain by low power laser irradiation. Neurosci. Lett. Vol. 43, 339-344, 1983.
2.
BischkoJJ, Use of the laser beam in acupuncture. Acupuncture & Electro-Therapeutics Res., Int. J. Vol. 5, 29-40, 1980.
3.
KroetlingerM, On the use of the laser in acupuncture. Acupuncture & Electro-Therapeutics Res., Int. J. Vol. 5, 297-311, 1980.
4.
DimitriadisVK, Effect of Ne-He laser on the midgut cells of Drosophila Auraria larvae and its correlation with acupuncture. Acupuncture & Electro-Therapeutics Res., Int. J. Vol. 10, 67-72, 1985.
5.
WuW, Recent advances in Laserpuncture. New Frontiers in Laser Medicine and Surgery, AtsumiK (Ed), Elsevier, Amsterdam -Oxford-Princeton, pp. 491-497, 1983.
6.
D’AmourFESmithDL, A method for determining loss of pain sensation. J. Pharmacol. Exp. Ther. Vol. 72, 74-79, 1941.
7.
MinfengRJishengH, Rat tail flick acupuncture analgesia model. Chinese Medical Journal Vol. 92, 576-582, 1979.
8.
ChuLSWYehSDJWoodDD, Acupuncture points: their location and function in the human anatomy. Acupuncture Manual A Western Approach, ChuLSWYehSDJWoodbD (Eds.), Marcel Dekker, Inc., New York and Basel, pp 30-83, 1979.
CodyRSmithJ, Applied Statistics and the Statistical Analysis System (S.A.S) Programming Language, North-Holland, New York, pp. 114-115, 1987.
13.
ChiuDTJChengK, A study of the mechanism of the hypotensive effect of acupuncture in the rat. American Journal of Chinese Medicine. Vol 2, 413-419, 1974.
