The subjects were divided into two groups of five women each. One group, the acclimated (A) was exposed 10 times within two weeks, the first and the last exposures being the pre- and post-tests, respectively. The second group, the control (C) was exposed twice (pre- and post-tests) within 18 days. Measurements of rectal and skin temperatures, oxygen uptake, time to onset of shivering, and perceived cold were performed during all exposures.