On Sun, 23 Jul 2006 22:58:31 +0800, "Gerrit 't Hart" <[email protected]>
wrote:

    >Here in Perth (Australia) we have AVERAGE maximum temperatures in December
    >27.4C, January 29.7C, February 30.0C and March 28.0C so we do have some very
    >hot weather in our summer.

30c is not hot, and certainly not hot by Oz standards! Admittedly I've
never been to Perth, but dammit, the summer in Adelaide can average 10
or 15 degrees above that!

Actually, Adelaide is the only place I've seen where the weather
bureau reports 36c as 'warm'!
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DFM - http://www.deepfriedmars.com
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JohnT writes:

    > Yet another subject where Mixi is an expert. Would drinking copius
    > quantities of Guinness or Murphys disguise any symptoms?

Not for long. Alcohol causes dehydration and itself is not a form of
water that can assist in rehydration.

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Dave Frightens Me writes:

    > You can die from the heat in 3 or 4 hours, so the test is poor.

If you began drinking generously before exposure to the heat, you'll
have time to do the test--especially if you've been drinking enough to
keep your bladder full to begin with.

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Dave Frightens Me writes:

    > Actually, Adelaide is the only place I've seen where the weather
    > bureau reports 36c as 'warm'!

Weatherpersons in Phoenix do that regularly.

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"Mxsmanic" <[email protected]> wrote in message
news:[email protected]...
    > JohnT writes:
    >> Yet another subject where Mixi is an expert. Would drinking copius
    >> quantities of Guinness or Murphys disguise any symptoms?
    > Not for long. Alcohol causes dehydration and itself is not a form of
    > water that can assist in rehydration.

But I could die happy.

JohnT

Martin <[email protected]> wrote:

    > On Sun, 23 Jul 2006 18:16:45 +0100, "JohnT"
    > <[email protected]> wrote:
    >
    > >
    > >"Mxsmanic" <[email protected]> wrote in message
    > >news:[email protected].. .
    > >
    > >>
    > >> Watch your urine output. You should have a full bladder every 3-4
    > >> hours at least, and the urine should not be brightly colored.
    >
    > Even after eating beetroots?

I resemble that remark. There's nothing worse than forgetting you've
eaten them the next day!

--
David Horne- http://www.davidhorne.net
usenet (at) davidhorne (dot) co (dot) uk
http://homepage.mac.com/davidhornecomposer http://soundjunction.org

On 23/07/06 19:21, in article [email protected],
"Mxsmanic" <[email protected]> wrote:

    > Earl Evleth writes:
>> One summer I dug ditches in the hot
    >> California sun, and one need both lots of water and salt tablets.
    >
    > One needs water and food. Salt tablets are not generally a good idea.
    >

The anti-salt mania came in to mode a number of years agos.

However

http://www.rice.edu/~jenky/sports/salt.html

Salt and the ultraendurance athlete

Recently, Americans have been urged to pay more attention to their sodium
intake. Decades ago, all foods seemed heavily salted. Then, a link between
sodium intake and high blood pressure was discovered. Suddenly, "sodium -
free" or "low sodium" products began flooding the consumer market.
Certainly, to a degree, this is justified. Many diseases are worsened by
excess sodium intake, and millions of Americans must closely watch the
amount of sodium in their diet.

However, sodium is a required element for normal body functions. It is lost
in sweat and urine and is replaced in the diet. The body has a remarkable
ability to maintain sodium and water balance throughout a variety of
conditions, thus ensuring our survival. Ultraendurance events challenge this
survival mechanism.

In hot, humid conditions a large amount of sweat is lost, which can disturb
sodium and water balance. Adequate hydration and sodium intake -- either via
sports drinks or food -- becomes vitally important during long races. The
goal of this article is to help you determine how to maintain sodium balance
during training and racing and during recovery. The information for this
article came from a variety of published studies done on healthy, young
athletes and may not be appropriate for everyone. Athletes who are under a
physician's care or have health problems should check with their doctor
about salt and their ability to exercise in the heat.


Hyponatremia -- what is it?

Hyponatremia means a low concentration of sodium in the blood. When it
occurs in triathletes, it usually happens during long or ultra-distance
races in the heat but may occur anytime. It is estimated that approximately
30% of the finishers of the Hawaii Ironman are both hyponatremic and
dehydrated. The longer the race, the greater the risk of hyponatremia.


***

Basically if you are loosing a liter an hour in sweat, you are loosing
also salt.

"Sweat contains between 2.25 to 3.4 grams of sodium chloride per liter"

Which is why sweat is salty. Got it now.

On 23/07/06 21:34, in article
[email protected], "JohnT"
<[email protected]> wrote:

    >> Not for long. Alcohol causes dehydration and itself is not a form of
    >> water that can assist in rehydration.
    >
    > But I

Some of the bums (clochard) in Paris have been dying because
of drinking only beer and not enough water.

On Sun, 23 Jul 2006 20:34:03 +0100, "JohnT"
<[email protected]> wrote:

    >"Mxsmanic" <[email protected]> wrote in message
    >news:[email protected].. .
    >> JohnT writes:
    >>> Yet another subject where Mixi is an expert. Would drinking copius
    >>> quantities of Guinness or Murphys disguise any symptoms?
    >> Not for long. Alcohol causes dehydration and itself is not a form of
    >> water that can assist in rehydration.
    >But I could die happy.

More than he ever will.
a) alcohol is not a form of water
b) It is possible to stay hydrated by drinking beer. I am living proof
--

Martin

Lol !!!
Where did he see that, in his dreams ???
He flees when he sees one.

"Earl Evleth" <[email protected]> a écrit dans le message de news:
C0E9A106.B1255%[email protected]...
    > On 23/07/06 21:34, in article
    > [email protected], "JohnT"
    > <[email protected]> wrote:
    >>> Not for long. Alcohol causes dehydration and itself is not a form of
    >>> water that can assist in rehydration.
    >> But I
    > Some of the bums (clochard) in Paris have been dying because
    > of drinking only beer and not enough water.
    >

On Sun, 23 Jul 2006 21:54:26 +0200, in rec.travel.europe, Earl Evleth <[email protected]>
arranged some electrons, so they looked like this:

...
... Basically if you are loosing a liter an hour in sweat, you are loosing
... also salt.
...
... "Sweat contains between 2.25 to 3.4 grams of sodium chloride per liter"
...
... Which is why sweat is salty. Got it now.

Tears, too.

On Sun, 23 Jul 2006 20:52:49 +0200, Mxsmanic <[email protected]>
wrote:

    >Dave Frightens Me writes:
    >> You can die from the heat in 3 or 4 hours, so the test is poor.
    >If you began drinking generously before exposure to the heat, you'll
    >have time to do the test--especially if you've been drinking enough to
    >keep your bladder full to begin with.

So why would one need air-con?
--
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DFM - http://www.deepfriedmars.com
---
--

Earl Evleth writes:

    > The anti-salt mania came in to mode a number of years agos.

It is unrelated to the real need (or lack of need) for salt tablets,
however.

    > Basically if you are loosing a liter an hour in sweat, you are loosing
    > also salt.

But you are losing water faster than you are losing salt, because salt
is very hypotonic as compared with body fluids. Which means that, in
fact, you are entering a state of electrolyte overload as you sweat.
The last thing you'd want to do in this case is take salt tablets.
You're already in hypernatremia, and eating salt will make it
worse--and hypernatremia is even deadlier than hyponatremia.

What you must do is drink water. Ideally the water should be isotonic
with sweat, although that may be difficult to achieve and it isn't
likely to be very appetizing. Failing that, plain water and an
occasional something to munch on will suffice. Salt tablets are not
necessary and are usually a bad idea.

It takes a tremendous amount of exertion to lose enough electrolytes
through sweating that rehydration with plain water will induce any
significant degree of electrolyte deficit. While water intoxication
and hyponatremia have received a lot of press in recent years, they
remain extremely rare in clinical manifestation, particularly compared
to dehydration.

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Dave Frightens Me writes:

    > So why would one need air-con?

Because sweating is often not enough, and it is very taxing on the
organism even when it works.

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Mxsmanic wrote:

    > JohnT writes:
    >
    >>Yet another subject where Mixi is an expert. Would drinking copius
    >>quantities of Guinness or Murphys disguise any symptoms?
    >
    > Not for long. Alcohol causes dehydration and itself is not a form of
    > water that can assist in rehydration.

Alcohol isn't a form of water at all, numbnuts.

Also, beers like Guinness or Murphy's are at least 95% water.
--
dgs