Transient Sweat Rate Calculation from Humidity Measurements Under Clothing
ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA BIOPHYSICS AND BIOMEDICAL MODELING DIV
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This study demonstrates a method for monitoring evaporative sweat rates EvapSR during steady and intermittent activities. The method was validated on a sweating thermal manikin wearing a long sleeved shirt and trousers standard military battle dress uniform instrumented with temperature-humidity sensors under the clothing. The manikin tests were at steady state conditions in an environmental chamber at 35 degrees C50RH and wind speed ranging between 0.36 and 1.94 m.s-1. The manikin was adjusted to produce sweat rates between 0 and 150 g.m-2. h-1. EvapSR was estimated from weighted measured skin wettedness and the maximum evaporative rate, and compared to the manikins sweat rate. This technique was further validated with humans engaged in intermittent work. Overall, this is a simple promising approach for estimating EvapSR. The method is non-invasive and enables monitoring and assessment for safety, health and hydration status of industrial and military personnel engaged in a wide range of situations.