The effect of climate upon blood pressure has been the subject of a number of investigations. Allbutt (1) quotes a Dr. Oliver as having “made comparative estimates of blood pressure in hot and cold weather respectively, and satisfied himself that on the whole, in continuously hot weather, the blood pressure in the brachial artery fell, while in the phalangeal vessels there was a rise.” Franke (2) studied variations of blood pressure as a result of climatic influences and tried to correlate variations in the blood pressure with variations in barometric readings. He claimed to find that after the barometer falls the blood pressure rises. Norris (3) observes: “Much has been written on the effect of tropical sunlight on white men. To whatever the deleterious effects are due, they are apparently not the result of blood pressure changes.”
Most of the studies of the effect of climate on blood pressure have been made in tropical countries.