"The human body generates a small amount of heat through shivering (Stage One Hypothermia 98.6 F to 95.0 degrees). Feeling Cold, Shivering, Drowsiness, Slurred Speech, and Disorientation are all symptoms of stage one (mild hypothermia). Note: A person with “Stage One” hypothermia will appear to be intoxicated.
As you can see, a variation of only 3.6 degrees from your normal body temperature can cause adverse effects that can severely affect your ability to do the things you need to do to survive.
Now lets go a step further. Lets say your body temperature drops below 95 degrees. You are now entering Stage Two Hypothermia (95-91 degrees). The symptoms include diminished shivering, decreased level of consciousness, and slower rate of respiration. For the person in water (P.I.W.) without floatation, this is where you are starting to get into very serious trouble. The shivering you experienced in stage one hypothermia has caused you to use up a lot of energy. Once the shivering stops, your body will no longer have the ability to re-heat itself. You will be very exhausted and unable to maneuver from on coming waves and swells. You will start gasping in mouthfuls of water and will not be able to stay afloat, thus drowning will eventually occur.
Now move down to the next level. Stage Three (Severe Hypothermia) 91-86 degrees. Symptoms include muscle rigidity, and loss of consciousness. I hope I don’t have to explain what happens to a P.I.W. without floatation when he loses consciousness."
Bring the drysuit and use it for any expected long deco dives.
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