The WHO library is not a well known resource for OHS professionals, but it does have some gems.
One of the oft quoted articles on heat stress is available as a PDF from the WHO library. It is also available in Russian.
WHO (1969) Health factors involved in working under conditions of heat stress : report of a WHO scientific group [meeting held in Geneva from 29 August to 4 September 1967] WHO Scientific Group on Health Factors Involved in Working under Conditions of Heat Stress.
I have annotated the figure that is most used below (click on figure for larger version):
The curves represent the increases in core body temperature, heart rate and sweat rate for conditions of low stress, complete compensation and limited compensation. I have added a curve for the effects of acclimatisation – the primary physiological adoption is for the body to produce more sweat. Of course, if the sweat drips off the body, it does little to cool it.
