Thermoregulatory reactions to cooling in rats with hereditary arterial hypertension.

Experiments on rats with hereditary stress-induced arterial hypertension showed that hypertension shortened the latency and increased the amplitude of constrictive reaction of skin blood vessels to rapid cooling characterized by more rapid and considerable increase in blood norepinephrine content compared to slow cooling. Decreased thermal threshold of metabolic reaction suggests that arterial hypertension is accompanied by changes in both the vascular walls and tissues involved in metabolic reaction to cooling.