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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation > Video on effects of cold water / lifejackets
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Thread: Video on effects of cold water / lifejackets Reply to Thread
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Topic Review (Newest First)
06-04-2012 12:37 AM
jackdale
Re: Video on effects of cold water / lifejackets

Quote:
Originally Posted by Hudsonian View Post
The superior buoyancy of the inflatable PFD's keep your head out the water better than many foam PFD's. In cold water keeping your head and neck out of the water is important to reduce heat loss.
Apparently that is a myth. Still you want to mitigate against ingesting water, especially salt water.

Quote:
When it comes to wrapping up on a cold winter's day, a cosy hat is obligatory. After all, most of our body heat is lost through our heads – or so we are led to believe.

Closer inspection of heat loss in the hatless, however, reveals the claim to be nonsense, say scientists who have dispelled this and five other modern myths.

They traced the origins of the hat-wearing advice back to a US army survival manual from 1970 which strongly recommended covering the head when it is cold, since "40 to 45 percent of body heat" is lost from the head.

Rachel Vreeman and Aaron Carroll, at the centre for health policy at Indiana University in Indianapolis, rubbish the claim in the British Medical Journal this week. If this were true, they say, humans would be just as cold if they went without a hat as if they went without trousers. "Patently, this is just not the case," they write.

The myth is thought to have arisen through a flawed interpretation of a vaguely scientific experiment by the US military in the 1950s. In those studies, volunteers were dressed in Arctic survival suits and exposed to bitterly cold conditions. Because it was the only part of their bodies left uncovered, most of their heat was lost through their heads.

The face, head and chest are more sensitive to changes in temperature than the rest of the body, making it feel as if covering them up does more to prevent heat loss. In fact, covering one part of the body has as much effect as covering any other. If the experiment had been performed with people wearing only swimming trunks, they would have lost no more than 10% of their body heat through their heads, the scientists add.
Scientists debunk myth that most heat is lost through head | Science | The Guardian
06-03-2012 11:57 PM
Hudsonian
Re: Video on effects of cold water / lifejackets

The superior buoyancy of the inflatable PFD's keep your head out the water better than many foam PFD's. In cold water keeping your head and neck out of the water is important to reduce heat loss.
05-31-2012 09:40 PM
rgscpat
Re: Video on effects of cold water / lifejackets

For me, float coat when air and water temps are both chill.
04-13-2012 05:45 PM
Barquito
Re: Video on effects of cold water / lifejackets

I was thinking, on my boat SOP would be foamies when water temp is below, say, 45 F, and inflatable above 45 F.
04-12-2012 05:41 PM
jackdale
Re: Video on effects of cold water / lifejackets

Quote:
Originally Posted by ottos View Post
In the US also ! (An inflatable PFD, that is)
Thanks for that information
04-12-2012 04:40 PM
ottos
Re: Video on effects of cold water / lifejackets

Quote:
Originally Posted by jackdale View Post
In Canada, if you are not wearing it, it does not count as a pfd.
In the US also ! (An inflatable PFD, that is)
04-11-2012 03:22 PM
justflie
Re: Video on effects of cold water / lifejackets

This would have never crossed my mind. Thanks for the post.
04-11-2012 02:49 PM
jackdale
Re: Video on effects of cold water / lifejackets

Quote:
Originally Posted by MarkSF View Post
Yes I think they do, I have a kayaking one that is particularly warm. But inflatables are so comfortable that I'm happy to wear mine all the time, even on hot days, while I wouldn't be happy to wear a closed cell. That's the big advantage of inflatables, they get worn.
I do agree that people do tend to wear inflatables, rather than the foamies. In Canada, if you are not wearing it, it does not count as a pfd.
04-11-2012 01:04 PM
MarkSF
Re: Video on effects of cold water / lifejackets

Yes I think they do, I have a kayaking one that is particularly warm. But inflatables are so comfortable that I'm happy to wear mine all the time, even on hot days, while I wouldn't be happy to wear a closed cell. That's the big advantage of inflatables, they get worn.
04-11-2012 12:40 PM
Barquito
Re: Video on effects of cold water / lifejackets

Jackdale - good info on Boot Camp website. So, it looks like obese people can survive much longer in cold water. Awsome, I think I will have another donut! Seriously, I wonder if closed cell foam lifejackets preserve body heat better that inflatables.
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