Thermal limits of men in moderate to heavy work in tropical farming.

摘要: The farmers in tropical climate are exposed to high heat during the summer months. study examined physiological strains of (N=26) six combined exposures work and heat, with moderate heavy (26 50%, 51 75% VO2max) three ambient conditions, i.e., 34.4 42.2°C WBGT (inside) an environmental chamber. While cardio-respiratory responses Tcr were predominantly influenced by severity (p<0.001), warmth greatly sweating response (p<0.001). importance was placed on segmental Tsk as first rank indicator bodily strain. Both had independent discernable effects dynamic equilibrium central peripheral mechanism regulate body temperature. compartmental (core, muscle, fat skin) balance analysis indicated span convergence core muscle temperatures divergence skin (CORE-SHELL) a quantitative estimate gradient for transfer. summation exchange across compartments segments yielded transient change (0.06 0.12°C/min), significant difference between work. 39°C taken limit tolerance farmers, defining criteria ~2.5°C from basal rate Tcr, times estimated. Corollary development ISO 7933 standard (PHS index), predictions or exponential relationship (tolerance time, min = 1,841 e -0.103 WBGT) useful suggest protective men at extremely hot environment. simplicity prediction lies using criterion. equation estimated time 55 34°C WBGT, up 38°C decrease 4 5 per degree increase warmth. Beyond decreased 2 3 WBGT. Further optimization validation knowledge women different age groups will have application managing illnesses disorders farming.