Abstract
The effect of Low Energy Lasers Irradiation (LELI) from green (570nm) cw HeNe laser, red (632nm) cw HeNe laser and pulsed I.R. lasers (904nm) at 950Hz and 4500Hz, on the peripheral nervous system, was examined. The sciatic nerve in rats was surgically exposed, crushed and then subjected to direct irradiation of each laser. It was found that both HeNe lasers significantly boot the electrical activity of the injured nerve, the green (570nm) HeNe laser being more effective. On the other hand, no effect on the electrical activity of the nerve was found with the I.R. lasers. In the second part of this work we made an attempt to explain the phenomenon of low-laser tissue interaction. We found, by an E.P.R. (Electron Paramagnetic Resonance) technique, that singlet oxygen is produced during the irradiation. Singlet oxygen in small amounts is very significant in biochemical processes and hence can be important in biostimulation. It is proposed that singlet oxygen is photoproduced by the natural porphyrins existing in every cell.
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