Citat:
Ursprungligen postat av Wikipedia.org
Normal body temperature in humans is 37°C (98.6°F). Hypothermia can be divided in three stages of severity.
In stage 1, body temperature drops by 1-2°C below normal temperature (1.8-3.6°F). Mild to strong shivering occurs. The victim is unable to perform complex tasks with the hands; the hands become numb. Blood vessels in the outer extremities contract, lessening heat loss to the outside air. Breathing becomes quick and shallow. Goose bumps form, raising body hair on end in an attempt to create an insulating layer of air around the body (limited use in humans due to lack of sufficient hair, but useful in other species). Often, a person will experience a warm sensation, as if they have recovered, but they are in fact heading into Stage 2. Another test to see if the person is entering stage 2 is if they are unable to touch their thumb with their little finger; this is the first stage of muscles not working.
In stage 2, body temperature drops by 2-4°C (3.6-7.2°F). Shivering becomes more violent. Muscle mis-coordination becomes apparent. Movements are slow and labored, accompanied by a stumbling pace and mild confusion, although the victim may appear alert. Surface blood vessels contract further as the body focuses its remaining resources on keeping the vital organs warm. The victim becomes pale. Lips, ears, fingers and toes may become blue.
In stage 3, body temperature drops below approximately 32°C (90°F). Shivering usually stops. Difficulty speaking, sluggish thinking, and amnesia start to appear; inability to use hands and stumbling are also usually present. Cellular metabolic processes shut down. Below 30°C (86°F) the exposed skin becomes blue and puffy, muscle coordination very poor, walking nearly impossible, and the victim exhibits incoherent/irrational behavior including terminal burrowing or even a stupor. Pulse and respiration rates decrease significantly but fast heart rates (ventricular tachycardia, atrial fibrillation) can occur. Major organs fail. Clinical death occurs. Because of decreased cellular activity in stage 3 hypothermia, the body will actually take longer to undergo brain death.
http://en.wikipedia.org/wiki/Hypothermia
Jag har dock ingen aning om hur lång tid det tar för kroppen att nå de olika temperaturerna.
Konsekvenser beror väl på till vilken grad du blivit nedkyld, såklart, men om syret inte kommer fram till hjärnan så finns det alltid risk för hjärnskador. Men det första jag kommer att tänka på vid nedkylning är kallbrand, som oftast drabbar fingrar och tår. Kallbrand följs ofta av amputation.
Edit: Jaha, det var i psykakuten jag var och skrev. Tänk då på att du kan ligga ett par timmar i kylan (beroende på vilken temperatur såklart) och de kan fortfarande ta tillbaka dig till liv, fast med amputerade lemmar och hjärnskador, inte ska du ta livet av dig eller, Särskilt inte genom förfrysning! Lägg ett par öl ute i kylan istället så kommer jag och hälsar på! Om det hela handlade om självmordstankar alltså, annars ber jag om ursäkt, blir ju lite misstänksam när man är här.