[Effect of adaptation to cold and physical training on heat emission during muscle work]

People, for a long time exposed to cold and physical training or cold only, exhibit strengthening of thermal regulatory reactions aimed at the preservation of heat in the body in the state of rest, as well as during muscular tension. Adaptation of the organism to cold in the situation of limited motor activity lead to the increase of the thickness of the body "cover" under the conditions of rest in the cold due to the decrease of the temperature of skeletal muscles, while physical training in the cold facilitates stabilization of muscular temperature and, correspondingly, lessening of the thickness of the "cover". At the initial stage of muscular activity thermal regulatory reactions of the organism are aimed at the decrease in heat emission, which promotes accelerated heating of the muscles.