HYPOTHERMIA
Prolonged exposure to cold water causes a condition known as
hypothermia – a substantial loss of body heat, which leads to
exhaustion and unconsciousness. Most drowning victims first suffer from
hypothermia. The following chart shows the effects of hypothermia: how
hypothermia affects most adults.
How hypothermia affects most adults
Water
Exhaustion or
Expected
Temperature ˚C (˚F)
Unconsciousness
Time of Survival
0.3 (33)
Under 15 min.
Under 15–45 min.
0.3–4 (33–40)
15–30 min.
30–90 min.
4–10 (40–50)
30–60 min.
1–3 hrs
10–16 (50–60)
1–2 hrs.
1–6 hrs.
16–21 (60–70)
2–7 hrs.
2–40 hrs.
21–27 (70–80)
2–12 hrs.
3 hrs. to Indefinite
Over 27 (over 80)
Indefinite
Indefinite
PFDs can increase survival time because they allow you to float without
using energy treading water and because of their insulating properties.
Naturally, the warmer the water, the less insulation you will require.
When operating in cold waters [below 60°F (15.6°C)] you should
consider using a coat or jacket style PFD or a Type V Thermal Protective
PFD as they cover more of the body than the vest or belt style PFDs.
Some Points to Remember About Hypothermia Protection:
1) Always wear your PFD. Even if you become incapacitated due to
hypothermia, the PFD will keep you afloat and greatly improve your
chances of rescue.
2) Do not attempt to swim unless it is to reach a nearby craft, fellow
survivor, or a floating object on which you can lean or climb.
Swimming increases the rate of body heat loss. In cold water, drown-
proofing methods that require putting your head in the water are
not recommended. Keep your head out of the water. This will greatly
Inflatable Vest with LIFT
TM
Owner’s Manual
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