No single heat stress index has gained universal acceptance within the past 20 years., despite extensive research. It is currently difficult to directly and quantitatively compare the many rational and empirical indices that are available, which results in confusion and a reluctance to change to a different index. A method is developed using the concept of limiting metabolic rate which allows virtually all heat stress indices to be compared with one another. Because all occupational heat stress indices are based, explicitly or implicitly, on the human heat balance equation, a unique value of metabolic rate can be found that just allows an unrestricted work/rest cycle in particular environmental conditions. A comparison using this methodology shows that there are very large differences between the recommended limits under the various indices, even for similar populations of acclimatized workers.
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- A valid method for comparing rational and empirical heat stress ...
Beat the Heat: Occupational Exposure to Heat and Hot Environments
With summer underway, now is the perfect time for organizations to examine their policies and procedures regarding employee heat exposure, especially in light of the recently published document from NIOSH titled, “Occupational Exposure to Heat and Hot Environments”, Publication Number 2016-106. What is the Issue? Heat-related injuries and illnesses in the workplace are more common than you would think. In 2010, for example, there were 4,190 injury or illness cases related to heat that resulted in...
Empirical validation of a new heat stress index
Thermal stress is a well-recognised health hazard in the workplace. In addition to the health deficits, working in the heat can impact significantly on the productivity of some industries which are located in harsh environments. A long-standing dilemma in OHS has been the specification of what constitutes a safe working environment. The current indices used to evaluate the environment are either flawed or are difficult to implement. A new heat stress index, the thermal work limit, has now been developed which...
Heat waves in Central Europe (1991–2006)
The extreme weather phenomenon of heat waves poses a serious threat to humans and has been shown to contribute to increased sickness rates and even deaths, mostly in large cities. The paper concerns the occurrence of heat waves in Central Europe. Data was collected from five regional weather stations in Budapest, Krakow, Lvov, Prague and Vienna and included records of the average, maximum and minimum daily air temperatures during the period 1991–2006. The authors defined a heat wave as an unbroken period of at...
New Measures to Protect Workers from Heat Stress in China
Work system to control heat exposure It is stipulated in the Measures that working time under high temperature shall be controlled by employers, unless exceptional cases of damaging life & property security and public interest exist. When the temperature reaches 40°C, outdoor work shall cease. When it stands at 37°C to 40°C, outdoor work shall not exceed more than 5 hours. Whereas at 35°C to 37°C, shifts shall be arranged so that continuous exposure to high temperature is avoided,...
Heat Stress In The Workplace
Heta stress monitoring, why you should monitor, effects of heat stress and how to combat it in the workplace. Why should you measure heat stress? If you or your employees work in hot environments you may be susceptible to heat stress. Heatstress us caused when the temperature of a surround area or the core body temperature is raisedresulting in dangerous high levels. High core body temperature can result in internal heat damage tovital organs. How can you tell? If you do work in hot environments there are...