Measurements of body core temperature and skin temperature
The core body temperature was measured by infrared tympanometry (Braun, ThermoScan PRO 6000, Marlborough, MA) after each calorimetry. The skin surface temperature was monitored continuously every minute during the study visits by wireless iButtons (Maxim Integrated, San Jose, CA, United States) placed at 11 defined body locations. Supraclavicular region (right and left), parasternal at the level of the second intercostal space (right and left), umbilicus, mid-thigh (right and left), middle of the lower arm palmar side, finger tip of the 3