３７
22. Heat stroke index
The index sticker for each product is included in the package of
this product.
Please affix the sticker on the battery cover on the back of the
main unit, as needed.
Guidebook for the Prevention of Heatstroke During Sports Activities
(WBGT-301)
Heat Index
(WBGT)
Guides to how much exercise can be safely performed
≥
31
°
C
Exercise
prohibited
At a WBGT of 31°C or above
Exercise is prohibited except for special cases. Especially
for children, it should be stopped.
28°C
-
31°C
Severe Warning
（
heavy exercise
is prohibited
）
At a WBGT of above 28°C
the danger of heat stroke is high, so events that require
heavy exercise or events where the body temperature
will rise, like endurance races should be avoided. When
such events are held, rest periods should be often
provided, and replenishment of water and salt
conducted aggressively. People who are weak or not
used to the heat should stop the exercise.
25°C
-
28°C
Warning
（
rests should
be provided
often
）
At a WBGT of above 25°C
the danger of heat stroke increases, so rest periods
should be often provided, and replenishment of water
and salt conducted. Rest periods should be provided
every 30 minutes for events requiring heavy exercise.
21°C
-
25°C
Caution
(Frequent
rehydration
necessary
）
At a WBGT of above 21°C
the fatal accidents may be caused by heat stroke, so
caution is advised, and replenishment of water and salt
should be promoted during exercise.
<21°C
Almost safe
(Adequate
rehydration
necessary)
At a WBGT of below 21°C
normally the danger of heat stroke is small, but
appropriate replenishment of water and salt is
necessary. Heat stroke can occur even under these
conditions in events such as citizen marathons, so
caution is advised.
Reference: Japan Sports Association, "Guidebook for the Prevention of Heatstroke
During Sports Activities"
