Temperature, regulation in hot-humid environments, with special reference to the significance of hidromeiosis

Acute and adaptive responses in humans to exercise in a warm, humid environment

“…However, since the sampling procedure was consistent and the same each day, the results indicate a falling [Na + ] in the sweat produced. We did not observe the decline in sweat rate with time which has been reported earlier in humid heat [3,4,11,27,33]. One reason for this is probably that we only measured the rate of evaporation continuously, not the dripping sweat.…”

“…The total volume of sweat collected as drops was measured after exercise, and the average rate calculated by dividing the volume by the duration. As the duration of our study was only 45-50 min, it is possible that hidromeiosis had not occurred, as this decline usually requires longer to develop [3,4,11,27,33]. However, the reason for the increased sweating is unclear as the rise in T core and hormone concentrations were similar before and after acclimation.…”

“…Their data (mean and range) were: age 27.5 (23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34) years, weight 78.0 (65-98) kg, height 185 (175-193) cm and maximum O 2 uptake (V . O 2,max ) 62 (45-73) ml kg -1 min -1 (estimated from submaximal heart rate in the cool control experiment).…”

The skin’s role in human thermoregulation and comfort

“…Proposed mechanisms include squeezing the sweat pores by swelling in the epidermal cells, changes in the water/salt balance around the sweat glands affecting the secretion rate, and changes in the transmission of nerve impulses at the junction between nerve and gland. Because a fully wetted skin surface cannot further increase its evaporative heat removal rate, and is likely to be experiencing sweat drip, the hidromeiosis mechanism has adaptive benefit to the body by reducing unproductive (in heat removal terms) water loss (Ogawa et al, 1984).…”

Study on Assessment of High Temperature and Humidity in Working Environment on Human Health

“…It concluded that workers over 45 years of age, especially for women of low oxygen metabolism capacity, worked under high temperature would cause high physiological consumption and high working capacity reduction. Ogawa et al [5] reported the significance of sweating to thermoregulation under heat and moisture environment. Sweating and evaporation maintained the thermal equilibrium of humanbodies and caused the weight loss.…”