G. Markelov. On the Treatment of Neuralgias with Blue Light. The Therapeutic Review, December 1909

Abstract

In order to clarify the question of what we are dealing with in phototherapy, whether it is exclusively with local heating of the skin, or whether the therapeutic effect depends on the chemical action of blue rays, the author made a series of observations, using alternately blue and red bulbs. It turned out that although the use of red light resulted in an increase in skin temperature twice as large as with blue rays (by 9-10° in the 1st case, only 5-6° in 2 m), pain sensations disappeared only when blue light was used.

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