[Knowledge status of the effect of long-term heat exposure on health].

The actual occupational hygienic limit values for heat stress are based only on acute thermic effects. It cannot, however, be excluded that occupational heat exposure lasting for many years is able to cause chronic alterations of health status to such an extent that long-term effects have to be considered in occupational hygienic heat stress evaluation. In the present paper the essential effects of long-lasting heat stress are discussed on the basis of information from specialized literature, referring primarily to circulation system and water and electrolyte balance.

[Value of complex methods of evaluating microclimatic conditions].

The authors have checked the correctness and accuracy of the total index of microclimate evaluation, using an analog calculator to process the measurements. Information on the measurements of climate was analysed basing on the total index of climate evaluation qtr, Predicted -- 4 -- Hour -- Sweat -- Rate P4SR, Index of Thermal Stress ITS, Wet Bulb Globe Temperature WBGT, Globe -- Temperature tg, Heat Stress Index HSI, Humid Operative Temperature toH and Effective Temperature ET. In addition, under standard conditions, with differentiated degree of physical effort, the following physiological parameters have been determined in 37 subjects: heart rate, internal body temperature, skin temperature and sweat loss.