Title: Heat Stress Acclimatization | NIOSH | CDC
Headings: Acclimatization
Acclimatization
Acclimatization schedule
Maintaining acclimatization

Content: Heat Stress Acclimatization | NIOSH | CDC
Acclimatization
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Acclimatization is the beneficial physiological adaptations that occur during repeated exposure to a hot environment. These physiological adaptations include: Increased sweating efficiency (earlier onset of sweating, greater sweat production, and reduced electrolyte loss in sweat). Stabilization of the circulation. The ability to perform work with lower core temperature and heart rate. Increased skin blood flow at a given core temperature. To acclimatize workers, gradually increase their exposure time in hot environmental conditions over a 7-14 day period. New workers will need more time to acclimatize than workers who have already had some exposure. Acclimatization schedule
For new workers, the schedule should be no more than a 20% exposure on day 1 and an increase of no more than 20% on each additional day. For workers who have had previous experience with the job, the acclimatization regimen should be no more than a 50% exposure on day 1, 60% on day 2, 80% on day 3, and 100% on day 4.