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Karla, let me get to that one once we have explained the full story on deco.
The full story entails the physiological aspects. This is where helium
shines. I will go over all of that.
The short answer is that what goes in fast also goes out fast, helium
causes no damage and thus no immune system response as does nitrogen, it is
easier to breathe, it solves other problems ( like narcosis for deep deco),
it does not already exist in the body or have any function in our
physiology.
If you had your choice of any gas to dive, it would be heliox for
everything. As this is impractical for most of us, we try to do it as close
to what is optimal given the resources at our command. I have a Haskel pump,
and I still don't do it. Luckily, the presence of helium in at least 25-30%
of the mix seems to be enough to hold off the stiffening effects on red
cells at shallower depths. Deeper , I push the helium into the 60-70 range.
With Luxfer 80's in fresh water, 65% seems to be the level that makes the
bottles neutral when full, a big advantage for long range multi stage
diving, but that is another topic.
I'll get to it fully in the posts to follow. I want to be sure everyone can
see the basic hemodynamics of this from the first post so that the rest does
not look like bullshit.
-----Original Message-----
From: Dogtrner1@ao*.co* [mailto:Dogtrner1@ao*.co*]
Sent: Thursday, February 07, 2002 6:09 AM
To: trey@ne*.co*
Subject: Re: Decompression DIR style
In a message dated 2/6/2002 10:20:26 PM Eastern Standard Time,
girvine@be*.ne* writes:
Most of you are familiar with the worst of them, which is "get off the
helium as fast as you can". If dive instructor has told you that, you
are
dealing with the worst kind of idiot.
Could you explain. The reason I was told this was because your tissue
saturation is so quick with helium.
I am willing to agree that it might be wrong. But why is it wrong?
Permission to repost this to the list.
Karla
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<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial
color=3D#0000ff =
size=3D2>Karla,=20
let me get to that one once we have explained the full story on deco. =
The full=20
story entails the physiological aspects. This is where helium shines. I =
will go=20
over all of that.</FONT></SPAN></DIV>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial
color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial
color=3D#0000ff =
size=3D2>The=20
short answer is that what goes in fast also goes out fast, helium =
causes=20
no damage and thus no immune system response as does nitrogen, it is =
easier to=20
breathe, it solves other problems ( like narcosis for deep deco), it =
does not=20
already exist in the body or have any function in our=20
physiology.</FONT></SPAN></DIV>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial
color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial
color=3D#0000ff =
size=3D2>If you=20
had your choice of any gas to dive, it would be heliox for everything. =
As this=20
is impractical for most of us, we try to do it as close to what is =
optimal given=20
the resources at our command. I have a Haskel pump, and I still don't do =
it.=20
Luckily, the presence of helium in at least 25-30% of the mix seems to =
be enough=20
to hold off the stiffening effects on red cells at shallower depths. =
Deeper , I=20
push the helium into the 60-70 range. With Luxfer 80's in fresh water, =
65% seems=20
to be the level that makes the bottles neutral when full, a big =
advantage for=20
long range multi stage diving, but that is another =
topic.</FONT></SPAN></DIV>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial
color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial
color=3D#0000ff =
size=3D2>I'll=20
get to it fully in the posts to follow. I want to be sure everyone can =
see the=20
basic hemodynamics of this from the first post so that the rest does not =
look=20
like bullshit.</FONT></SPAN></DIV>
<BLOCKQUOTE>
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B>
Dogtrner1@ao*.co*=20
[mailto:Dogtrner1@ao*.co*]<BR><B>Sent:</B> Thursday, February 07,
2002 =
6:09=20
AM<BR><B>To:</B> trey@ne*.co*<BR><B>Subject:</B> Re:
Decompression =
DIR=20
style<BR><BR></FONT></DIV><FONT
face=3Darial,helvetica><FONT =
size=3D2>In a message=20
dated 2/6/2002 10:20:26 PM Eastern Standard Time, =
girvine@be*.ne*=20
writes: <BR><BR><BR>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid; MARGIN-RIGHT: 0px"=20
TYPE=3D"CITE">Most of you are familiar with the worst of them, which =
is "get=20
off the <BR>helium as fast as you can". If dive instructor has =
told=20
you that, you are <BR>dealing with the worst kind of =
idiot.</FONT><FONT=20
lang=3D0 face=3DArial color=3D#000000 size=3D3=20
FAMILY=3D"SANSSERIF"></BLOCKQUOTE><BR></FONT><FONT lang=3D0 =
face=3DArial=20
color=3D#000000 size=3D2 FAMILY=3D"SANSSERIF"><BR>Could you explain. =
The=20
reason I was told this was because your tissue saturation is so quick =
with=20
helium. <BR><BR>I am willing to agree that it might be wrong. =
But why is=20
it wrong? <BR><BR>Permission to repost this to the list. =
<BR>Karla</FONT>=20
</FONT></BLOCKQUOTE></BODY></HTML>
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