| |
Main
Date: 14 Jan 2007 11:29:43
From: Raptor
Subject: How fast is too fast (to breathe)?
|
How long does it take for the lungs to transfer "sufficient" or
"optimal" O2 and CO2 to/from the blood?
I watch people on TV climbing Everest and they don't seem to be
breathing very fast. When I ride at altitude (8000' plus) I take approx.
120 breaths/minute. It seems to work for me, but is much faster than
other riders/athletes. Am I just moving air without purpose?
--
Lynn Wallace
If FDR fought fascism the way Bush fights terrorism, we'd all be
speaking German now.
|
|
| |
Date: 14 Jan 2007 14:38:16
From: MagillaGorilla
Subject: Re: How fast is too fast (to breathe)?
|
Raptor wrote:
> How long does it take for the lungs to transfer "sufficient" or
> "optimal" O2 and CO2 to/from the blood?
>
> I watch people on TV climbing Everest and they don't seem to be
> breathing very fast. When I ride at altitude (8000' plus) I take approx.
> 120 breaths/minute. It seems to work for me, but is much faster than
> other riders/athletes. Am I just moving air without purpose?
>
Bird with talons,
O2/CO2 exchange is done mostly at the surface area of the lungs and
therefore likewise only at the surface area of any given breath volume
(not sure how deep the exchange dips into lung volume surface). I'm not
sure of the optimal rate vs. volume trade-off one should strive for to
keep their lung exchange most efficient.
My guess though is that you might be chasing a red herring. I think your
blood is the rate-limiting factor in circulating oxygen to the body, and
not the amount of O2 absorbed in the lungs.
So your question might only apply to someone who was on EPO or
transfusions.
You should get on a stationary bike and only breathe pure O2 (usually
available for free from your local rescue squad if you have your own O2
tank). This will tell you if lung exchange is the rate limiting factor.
If you don't perform better while breathing pure O2, then the rate
limiting factor is probably your blood O2 carrying capacity levels - and
they are likely saturated when breathing natural atmospheric air (21%
oxygen). In fact, I think the rate limiting factor might actually be
your ability to discharge CO2 and doesn't even have much to do with O2.
I think rate of breathing is controlled by C02 levels (blood acidity),
not O2.
This 100% O2 experiment would have to be a fairly controlled experiment
(VO2 max test) though with power meter readings, O2 tube in mouth,
nostrils taped shut...and done at maximal effort. It can be done for
like $250-$350 by someone like Josh Gold:
http://pushhard.com/physiology.html
If you don't perform much better with pure O2 (100% O2) than you do with
atmospheric air (21% O2), then it's your blood (or other things) that is
the rate-limiting factor and not your mechanical pulmonary exchange.
Magilla
|
| | |
Date: 16 Jan 2007 00:25:21
From: Michael Press
Subject: Re: How fast is too fast (to breathe)?
|
In article <dzCdnTohHf40GzfYUSdV9g@ptd.net >,
MagillaGorilla <MagillaGorilla@zoo.com > wrote:
> You should get on a stationary bike and only breathe pure O2 (usually
> available for free from your local rescue squad if you have your own O2
> tank). This will tell you if lung exchange is the rate limiting factor.
Anybody out there taking this seriously, DON'T breath
pure O2, or even breath air fortified with O2. You will
kill yourself.
--
Michael Press
|
|
