[Trace effects of short-term cooling and their importance in the adaptation to cold]

Abstract

The thermoregulation traces (O2 consumption, electrical activity of cervical muscles deep rectal temperature and subcutis temperature) were observed to 30 min. at ambient temperatures + 20--24 degrees and + 6--7 degrees through 1, 5, 10 and 30 days after cooling. The after-effect (traces) of cooling depends on conditions of cooling. Single or double cooling followed by a fall in core temperature to 30 degrees as well as intermittent cold exposures (15 two-min. exposures at--20 degrees) without the core temperature falling and a cold long--term (4--5 weeks) exposure at + 2--4 degrees cause a prolonged after. The short-term cooling increases the trace reactions throuth 5--10 days after cooling. Their traces are similar to changes in a cold acclimation rats.