[Dynamics of temperature rhythm phases in the course of rhythm inversion]

The process of inversion of the diurnal rhythm of the body temperature was studied on two test subjects during an altered work-rest cycle. The temperature changes during individual phases were investigated. With respect to certain phases it is concluded that the rate of rearrangement depended on the relationship between these phases and the level of the physical and mental activity of the body. The inversion of the temperature rhythm induced changes in those phases of the temperature curve in which the temperature should not have changed due to an altered work-rest cycle. When evaluating the completeness of the rearrangement of the diurnal rhythm of the body temperature brought about by an altered work-rest cycle, it is important to pay particular attention to the body temperature in the minimum phase and in the adjacent phases, since the rate of the rearrangement of the temperature rhythm in these phases can be the lowest.