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 | (32.5) | Under 15 min. | Under |
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 Inflatable PFD. Even if you become incapacitated due to hypothermia, the Inflatable 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 lessen heat loss and increase your survival time.
3)Use the standard H.E.L.P. position when wearing an Inflatable PFD, drawing the legs up to a seated position, because doing so will help you conserve body heat (Fig. 18).
4)Keep a positive attitude about your survival and rescue. This will improve your chances of extending your survival time until rescued.
21 | Inflatable PFD Owner’s Manual |