Heat Stress
NIOSH defines heat stress exposure as the sum of the heat generated in the body (metabolic heat) plus
the heat gained from the environment (environmental heat) minus the heat lost from the body to the environment, primarily through evaporation. Many bodily responses to heat stress are desirable and beneficial because they help regulate internal temperature and, in situations of appropriate repeated exposure, help the body adapt (acclimatize) to the work environment. However, at some stage of heat stress, the body’s compensatory measures cannot maintain internal body temperature at the level required for normal functioning. As a result, the risk of heat-induced illnesses, disorders, and accidents substantially Many heat stress guidelines have been developed to
protect people against heat-related illnesses. The objective of any heat stress index is to prevent a person's CBT from rising excessively. The World Health Organization concluded that, “it is inadvisable for CBT to exceed 100.4ºF or for oral
temperature to exceed 99.5ºF in prolonged daily exposure to heavy work and/or heat.”5 According to NIOSH, a CBT of 102.2ºF should be consideredreason to terminate exposure even when CBT is being monitored. This does not mean that a worker with a CBT exceeding those levels will necessarily experience adverse health effects; however, the
number of unsafe acts increases as does the risk of developing heat stress illnesses. increases. Increases in unsafe behavior are also seen as the level of physical work of the job increases.
Heat StressNIOSH defines heat stress exposure as the sum of the heat generated in the body (metabolic heat) plusthe heat gained from the environment (environmental heat) minus the heat lost from the body to the environment, primarily through evaporation. Many bodily responses to heat stress are desirable and beneficial because they help regulate internal temperature and, in situations of appropriate repeated exposure, help the body adapt (acclimatize) to the work environment. However, at some stage of heat stress, the body’s compensatory measures cannot maintain internal body temperature at the level required for normal functioning. As a result, the risk of heat-induced illnesses, disorders, and accidents substantially Many heat stress guidelines have been developed toprotect people against heat-related illnesses. The objective of any heat stress index is to prevent a person's CBT from rising excessively. The World Health Organization concluded that, “it is inadvisable for CBT to exceed 100.4ºF or for oraltemperature to exceed 99.5ºF in prolonged daily exposure to heavy work and/or heat.”5 According to NIOSH, a CBT of 102.2ºF should be consideredreason to terminate exposure even when CBT is being monitored. This does not mean that a worker with a CBT exceeding those levels will necessarily experience adverse health effects; however, thenumber of unsafe acts increases as does the risk of developing heat stress illnesses. increases. Increases in unsafe behavior are also seen as the level of physical work of the job increases.
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