Local calorimetry was studied using a device to measure local evaporation rates (disk) and a ventilated capsule to measure local sweat rates (msw). Changes in msw and msk at chest, forearm and front thigh were observed while two young male subjects were exposed to the heat (46-48℃) for 1 hour. During the first 30-40 minutes, m_<SK> increased progressively with m_<SW> and became appreciably less than m_<SW> when the skin was fully wetted. Thus, the critical m_<Sk> value can be clearly defined so as to determine local evaporative heat transfer coefficients.
