Effect of Ultraviolet Irradiation Upon the Cutaneous Pain Threshold

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Abstract
Cutaneous pain threshold measurements, the degree of hyperalgesia, and intensity of erythema were studied during the development of burns caused by ultraviolet (UV) irradiation. The threshold dosage of UV radiation which caused pain threshold lowering and erythema was determined. The maximum fall of pain threshold as well as the duration of this lowering, and the intensity of hyperalgesia and erythema increased with increased UV dosage. These experimental data are considered to support the hypothesis that, as a result of irradiation, there is inhibition of metabolic processes of tissue "repair." Under these circumstances, slight elevation of skin temperature in a burn area is sufficient to cause pain.