Table 3.
Population specific heat acclimatization induction guidelines
| Population | Area of Modification | Days 1–2 | Days 3–5 | Days 6–14 | |
|---|---|---|---|---|---|
| Occupational | OSHA (OSHA 2017) | Increase heat exposure time each day over 7–14 days | |||
| NIOSH (NIOSH New workers 2016) | New workers | Day 1, < 20% of usual exposure | Subsequent days, < 20% increase from previous day | ||
| Workers with job specific experience | Day 1, < 50% of usual exposure | Day 3, < 80% of usual exposure | |||
| Day 2, < 60% of usual exposure | Day 4 and beyond, 100% exposure | ||||
| ACGIH (ACGIH 2017) | 3 weeks of physical activity under heat stress | ||||
| Athletic (Casa 2012a, b, 2013) | Number of practices permitted per day | 1 | 2, only every other day | ||
| Equipment | Helmets only | Helmets and shoulder pads | Full equipment | ||
| Maximum duration of single practice session* | 3 h | 3 h (a total maximum of 5 h on double session days) | |||
| Walk through time (not included as practice time) | 1 h (but must be separated from practice for 3 continuous hours) | ||||
| Contact | No contact | Contact only with blocking sleds/dummies | Full, 100% live contact drills | ||
| Military | Air Force (Secretary of the Air Force 2016) | > 2 continuous hours of work/exercise in 5 of the last 7 or 10 of the last 14 days define those who are acclimatized | |||
| Army (Department of the Army Headquarters 2016) | Regular strenuous exercise in the heat for 10-14 days defines heat acclimatized | ||||
| Navy (Navy and Marine Corps Public Health Center 2014) | Gradually increase physical training and work in hot, humid environments over days or weeks | ||||