The relation between sweat rate and weight loss when sweat is dripping off the body

Abstract

SUMMARY1. The relation between the rate of sweat production, S, and the rate of weight loss, W, has been examined under conditions in which the rate of evaporation was small.2. 9 could be found from TV provided that a film of liquid was maintained over the skin surface. This could be achieved initially by immersing the subject in water containing detergent. Thereafter the film was maintained so long as the rate of weight loss exceeded about 10 g/min.3. When the rate of weight loss was changing and the rate ofevaporation was constant, o could be calculated as + 2*5 W.4. When the subject was constantly sprayed with water while being weighed, the correction for W became negligible. In this case there was no lower limit to the sweat rate which could be measured, but spraying considerably reduced the accuracy of the measurement.5. The output of sweat from a ventilated capsule on the forearm correlated well with estimates of central sweating drive based on weight measurements corrected for hidromeiosis.

Development of an empirical model of human sweating and a semi-empirical model of human thermoregulation

“…CandEis et al (1979b) developed a relationship between skin wettedness and the efficiency of sweating, while investigated how skin wettedness affected the sweat gland activity. A correction for sweat rate and the weight loss it causes was developed for the ceise of sweat dripping off the body (Brebner and Kerslake 1969). Even the effect of the composition of the sweat in the film on the skin during long periods of sweating has been investigated experimentally (Berglund and McNall 1973).…”

“…A large body of work has been performed to study individual factors that affect the sweat response, including skin wettedeness Candas et ai. 1979b), clothing (Kenney et al 1993), skin temperature (Ogawa and Asayama 1986;Johnson et al 1984;McCaffrey et al 1979;Kondo et al 1997), air velocity (Adams et al 1992), salt accumulation on wetted skin (Berglund and McNall 1973), dripping sweat (Brebner and Kerslake 1969), acclimatization Fox et al 1964;Gonzalez et al 1974), physical training (Buono and Sjoholm 1988), posture of exercise Park 1981 and, and age (Tankersley et al 1991). This list is not exhaustive but does show the amount and variety of effort put forth in an attempt to understand and quantify the sweating response.…”