Hypothermia is a lowering of the body's normal temperature. It is a serious threat to sailors because of the potential for going overboard. Also, the Great Lakes are cold lakes – Lake Superior's average summer temperature is 40F/4C. Long hours at the helm can leave a sailor exposed to spray and wind which can sap the body's heat. Water wicks away body heat 25 times faster than air. |
Significant hypothermia occurs when the body's core temperature falls below 95degF/35 degC. Severe hypothermia occurs when the body temperature falls below 90F/32C. All body functions slow down including mental acuity, heart rate, and breathing. If the progressive cooling of the body's core is not stopped, the body steadily begins to shut down, beginning at the extremities – all in an effort to preserve the core temperature necessary to stay alive.
Speaking about hypothermia, both the Canadian Coast Guard and US the Coast Guard refer to the 1-10-1 rule.
From time of immersion, you have 1 minute to get your breathing under control. Studies show that 20% don't and therefore die, breathing in ice-cold water in an uncontrolled panic, gasp, panic and then drown. In some situations, the sudden immersion into cold water triggers a cardiac arrest.
The next 10 refers to the 10 minutes of useable muscle control. Here is where swimming begins to fail. Without a lifejacket, here is where drowning will likely occur.
The final 1 refers to 1 hour before hypothermia sets in. Note that if you don't have a lifejacket, you will likely not die of hypothermia as you will already have drowned.
Return from HYPOTHERMIA TREATMENT to FIRST AID
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