Betel chewing increases the skin temperature: effects of atropine and propranolol.

Although betel chewing produces sweating, facial flush and a warm sensation of the body, objective documentation of the temperature effect has not been available. In this report, the skin temperature of the ear and forehead was recorded before and during betel chewing in healthy betel chewers. Betel chewing produced a mean temperature increase of 2 degrees C and 0.5 degree C, respectively, for the ear and forehead. This hyperthermic response was almost completely abolished by atropine and partially inhibited by propranolol. The present data suggest that both sympathetic and parasympathetic mechanisms are involved in the skin thermal response to betel chewing.