the four stages of overstaying in cold waters.

[deon]

https://www.soundingsonline.com/voices/hypothermia

① STAGE-ONE: Cold Shock Response

20 percent of people die in the first two minutes. - They drown, they panic or they take on water in that first uncontrolled gasp.
- If they have heart problems, the cold shock may trigger a heart attack.

Overcoming Cold Shock Response

+ get your breathing under control, realizing it will pass and stay calm.

② STAGE-TWO: Cold Incapacitation

over 50 percent of the people who die in cold water die from drowning following cold incapacitation. - you will lose your ability to control your hands and the muscles - in your arms and legs will just flat-out quit working well enough to keep you above water.

Overcoming Cold Incapacitation

+ grab to something that will help you to float. + you have only 30 minutes max till you give in and drown.

③ STAGE-THREE: Hypothermia

Hypothermia can kill, but that only happens in about 15 percent of cold water deaths. - You have to have some form of flotation to get hypothermia, staying in cold waters for an hour +

Overcoming Hypothermia

Depends on your health, and on the duration you stayed floating in cold water. + The body’s efforts to keep the core warm — vasoconstriction and shivering — are surprisingly effective. Shivering and blood shunting to the core + are so productive that twenty minutes after jumping in, I had a fever of 100.2.

https://cdn.discordapp.com/attachments/762167429325127700/762194147032432640/unknown.png


④ STAGE-FOUR Circum-Rescue Collapse

the final killer of cold water immersion is circum-rescue collapse. - Shortly before, during, or after — sometimes hours after — rescue, - victims of cold water immersion pass out, experience ventricular fibrillation or go into full cardiac arrest.

Overcoming The Circum-Rescue Collapse

+ well... you shouldn't move a lot, not even stand up.. lol + Until everything is warmed again, out of the water and dry is good enough; mobility comes later.

 

[deon]

https://www.wetsuitmegastore.com/wetsuit/wetsuit-temperature-guide-and-chart.html

Less neoprene and thinner wetsuit means less strain on our muscles when we move. As soon as you put on a wetsuit you not only have to move your arms to propel yourself forward, you also have to pull and stretch the wetsuit you are wearing. Because of the extra work you get tired sooner. All for not being cold

Wetsuit thickness and water temperature guide

You can get this info from any manufacturer. Their temperature charts make you believe: “You only need a 3/2 millimeter wetsuit for 54F (12C) water, since our wetsuits are so advanced " - And even if their chart is OK, there are a few additional things that you need to keep in mind when choosing the right thickness for cold water.

​

What kind of wetsuit thickness should I get?

There are a few factors to consider: water temperature, air temperature, wind, cold sensitivity and activity.

Water temperature

Colder water – thicker wetsuit. Neoprene acts as an insulator against outer weather elements and the thicker it is the more insulation you have.

​

How Long Can You Survive in Cold Water?

Our body core temperature starts to drop and when it gets as low as 70 and 80 degrees F (21 – 27 degrees C) our heart usually stops.

The coldest water you can find will usually be around 39-41-degree F/ 4-5 degree C Generally a person can survive in water at that temperatures for 10 to 20 minutes.​

Water pulls heat out of your body about 25 times faster than air! water with temperature as high as 75 – 80 degrees F (24 – 27 degrees C) can be dangerous.​

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>> Here is the expected survival time in correlation with water temperature: https://cdn.discordapp.com/attachments/762167429325127700/762578136503681024/unknown.png(edited)

Air temperature

Warmer water in the summer, colder water in the winter. But there are also a lot of places on Earth where this isn’t completely true, so do ur research.

Wind

What does wind do? It cools the surface of your body and increases the feeling of cold. So if you use your wetsuit in wind then it should be thicker.

https://cdn.discordapp.com/attachments/762167429325127700/762580743842430986/unknown.png(edited)

Cold sensitivity

This changes from person to person. How quickly do you feel cold? For some people it is anything under 75F, some are comfortable in 60F… partly this might be conditioned with your body and blood circulation and partly this is just how used you are to cold.

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Activity

If you are active you burn energy and produce heat while you do it. Divers are not supposed to be very active, they must try to keep their heart rate down, breathing slowly to conserve oxygen.

>> So whenever you buy a wetsuit they don't tell you anything about this factors

Besides: When the water gets colder you also need to wear booties and later also gloves and a hood.

Wetsuit Quality​

Now – we were complaining how wetsuit manufacturers thickness charts suck and only want to make an impression but – quality IS a big factor. A good winter wetsuit will not easily let water penetrate to the inside. Things like double blindstitch, liquid sealing, taped seams, batflap etc… will stop cold water entering your wetsuit so a good one is a must in cold weather and water and this is also the reason that a good winter wetsuit is not cheap.

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WATER TEMPERATURE WETSUIT CHART https://cdn.discordapp.com/attachments/762167429325127700/762583223334993920/unknown.png

 

[deon]

about survival in water.
https://www.trngcmd.marines.mil/Portals/207/Docs/TBS/MCRP 3-02C Marine Combat Water Survival.pdf?ver=2015-02-27-140159-343

 

[Admin]