[Criteria for heat resistance and individual peculiarities].

In white rats, the body temperature recorded in the course of heat effect could not serve as an index of the heat resistance and its alteration in the course of adaptation in these animals. The adequate index of the rat heat resistance turned out to be the period of keeping the body temperature at a plateau level establishing within 30--70 min of the heat action, duration of the plateau significantly increasing in the course of heat adaptation. The individual peculiarities of the organism adaptability varied rather largely.