Heat Stress
Heat Stress
Heat Stress
STRESS
Presented by:
Office of Environmental Health and Safety
Individuals At Risk
• All individuals who work in hot
environments (inside and outside) are at
risk of developing heat stress.
• Heat Rash
• Heat Cramps
• Heat Exhaustion
• Heat Stroke
Heat Disorders
• Heat Rash
- Also known as “Prickly Heat.”
- Occurs when sweat cannot freely
evaporate from the skin and sweat ducts
become plugged. This inflammation can
cause a red rash.
- Can be prevented by wearing clothes
that allow sweat to evaporate as well as
bathing regularly and drying the skin.
Heat Disorders
• Heat Cramps
- Cramps in the arms, legs, or abdomen
75% Work, 25% rest, each hour 30.6°C (87°F) 28.0°C (82°F) 25.9°C (78°F)
50% Work, 50% rest, each hour 31.4°C (89°F) 29.4°C (85°F) 27.9°C (82°F)
25% Work, 75% rest, each hour 32.2°C (90°F) 31.1°C (88°F) 30.0°C (86°F)
These TLV's are based on the assumption that nearly all acclimatized, fully clothed workers with adequate water
and salt intake should be able to function effectively under the given working conditions without exceeding a deep
body temperature of 38°C (100.4° F). They are also based on the assumption that the WBGT of the resting place is
the same or very close to that of the workplace. Where the WBGT of the work area is different from that of the rest
area, a time-weighted average should be used (consult the ACGIH 1992-1993 Threshold Limit Values for Chemical
Substances and Physical Agents and Biological Exposure Indices (1992).
These TLV's apply to physically fit and acclimatized individuals wearing light summer clothing. If heavier clothing
that impedes sweat or has a higher insulation value is required, the permissible heat exposure TLV's in Table III:4-
2 must be reduced by the corrections shown in Table III:4-3.