Abstract
Sweat distribution over 21 body sites in 8 young males was described by determining the local sweat volume (LSRap), measured using absorbent pads throughout 3 different bicycle exercises performed at 35, 50, and 60% VO2max for 40 min, at 30°C and 50% relative humidity. The local upper back sweat rate was concurrently measured by the ventilated capsule method (LSRvc) in parallel with the absorbent method. The LSRap at the upper back correlated strongly with mean LSRvc at the position immediately above the absorbent pad (p<0.05). There were significant differences in LSRap among the 21 body sites within each exercise intensity (p<0.05). Regional comparisons showed a greater LSRap at the chest and back and lower LSRap at the flank, thighs, and legs. Moreover, LSRap was distributed symmetrically and was greater in the middle compared to the adjoining lateral sites. LSRvc data reanalysis of our previous studies on prepubertal boys, men, and women across a range of ages revealed that during passive and/or active heating, the LSRvc were arranged in order of lower limbs.
Highlights
The evaporation of sweat plays an important role in body heat loss, which is required for the maintenance of body core temperature during passive and/or active heating
The results provided valuable information for the design of clothes, these maps still offered a snapshot of local sweat rate (LSR) during exercise
Preparation of the absorbent pads: LSR was determined by taping the absorbent pads directly to skin surface at 21 body sites, which were maintained for the entire duration of the exercise
Summary
The evaporation of sweat plays an important role in body heat loss, which is required for the maintenance of body core temperature during passive and/or active heating. LSR is typically measured for a very small area of body skin when using the ventilated capsule method, and continuous measurements allow easy detection of the sweat response to changes in body temperature, which is simultaneously measured. The ventilated capsule method is suitable for physiological investigations, LSR data obtained from an extensive area of skin is required for developing a model of human thermoregulation, sweating thermal manikins, or designing protective clothing, sportswear, and outdoor clothing with transpiration efficiency. In addition to the small area targeted for measurement, the ventilated capsule method has a disadvantage when studying about body areas covered by clothing, because it is difficult to affix the apparatus, which consists of a thick capsule with a couple of air tubes, to the skin under the clothes
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