Flashcards in 10.1 b Temp. and Thermal Environment Deck (10):
Heat stroke is imminent when the core body temperature exceeds
Cold environments Four factors contribute to cold stress:
cold temperatures high or cold winds dampness cold water
Guidance on heat stress from the Australian Institute of Occupational Hygienists (AIOH) highlights the following adverse health effects: 5
heat stroke heat exhaustion heat syncope (fainting) heat cramps prickly heat (heat rash).
The first effect of excessive heat strain due to cold environments is pain. This is followed by numbness of the extremities, especially the fingers and toes, as the body shunts warm blood to the core, away from the non-vital extremities, such as the hands, feet, nose, cheeks and ears. The effects include: 4
chilblains frostbite immersion foot (trenchfoot) hypothermia (which may be mild, moderate, or severe).
36.5 – 32 °C
32 – 30°C
30 – 25.5°C
The effects and severity of heat strain on individuals depends on the physiological capacity of the individual, as influenced by the following personal factors: 8
age gender general health (including medical conditions, weight and general fitness etc.) state of hydration alcohol, caffeine and diet nicotine use medications and non-prescription drugs acclimatisation and protective clothing and other protective equipment.
Thermal surveys - measurement equipment The external variables of interest in determining thermal comfort are:
air temperature mean radiant temperature relative humidity air flow.