Heat Index and Physical Exercise (Navy)
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Heat related illness
includes: heat rash, cramps, exhaustion and stroke. These illnesses are a real
danger to people not accustomed to the stress of hot weather exercise. The Wet-Bulb Globe Temperature Index
(WBGTI) takes into account four
variables: air temperature, humidity, radiant heat and air movement. This reading
gives a more accurate measurement of heat stress than any one reading alone.
Contact your local Environmental Prevention Medicine Unit (EPMU)
for PT related weather readings.
Note: Heat Index chart is different for Marine Corps. Click
here to view the Marine Corps chart.
Heat Index and Physical Exercise Chart
WBGT Index (F)
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Flag Color
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Intensity
of Physical Exercise
NAVMED P-5010 CH 9
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Less than 80 |
White |
Extremely intense
physical exertion may precipitate heat exhaustion or heat stroke, therefore, caution
must be taken. |
80-84.9 |
Green |
Discretion is required in planning heavy exercise for
unacclimatized personnel. This is a marginal heat
stress limit for all personnel. |
85-87.9 |
Yellow(Amber) |
Strenuous exercise
and activity must be curtailed for new and unacclimatized
personnel during the first 3 weeks of heat exposure. Outdoor classes in
the sun must be avoided when the WBGT index exceeds 85. |
88-89.9 |
Red |
Strenuous exercise must be curtailed for all personnel with less than 12 weeks training in hot weather. |
90 or Above |
Black |
Physical training and strenuous
exercise must be suspended for all personnel. (excludes operational commitment not for
training purposes). |
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Wearing body armor or NBC protective uniforms adds
approximately
10 points to the measured WBGTI. Limits of exposure should be
adjusted accordingly.
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