by madeintahoe » Wed Sep 01, 2010 6:14 pm
by Dow Williams » Wed Sep 01, 2010 6:47 pm
by mconnell » Wed Sep 01, 2010 7:57 pm
by kevin trieu » Wed Sep 01, 2010 8:27 pm
jschrock wrote:Yes, there is a physiological benefit to living at 6,300 and most people require some time to adjust.
by rhyang » Wed Sep 01, 2010 8:38 pm
by mconnell » Wed Sep 01, 2010 10:21 pm
jschrock wrote:mconnell wrote:As for not really gaining anything by living at 6300', I disagree. There are many people that struggle at 6300' elevation and need time to acclimatize even at that level so there is some benefit to already being acclimated to that elevation, although it might not be long term.
You might be misinterpreting my comment.
My comment is directed at the implication that living at 6,300 for 23 years should have provided the OP with any greater level of permanent acclimatization than anyone else who has spent a few days at the same altitude. Acclimatization is not permanent ... that's all.
Yes, there is a physiological benefit to living at 6,300 and most people require some time to adjust.
by Buz Groshong » Wed Sep 01, 2010 10:27 pm
jschrock wrote:rhyang - could be true but I've never seen anything indicating true long term physiological change. I guess it partially depends on your definition of 'long term'.
Quotes that apply to your comments from the only study I have handy......red blood cell volume does not increase the first 1-2 weeks of altitude residence, and significant increases in red blood cell volume are only seen during high altitude exposures exceeding 16-20 daysIn well-acclimatized personnel, effective altitude acclimatization will be maintained for about 5-7 days at low altitude. It is possible that occasional exposures to high altitude will delay de-acclimatization...
Like I said...I haven't seen anything indicating long term measurable benefits. I'd be interested if it's out there though.
by rhyang » Wed Sep 01, 2010 11:47 pm
Full hematological adaptation to high altitude is achieved when the increase of red blood cells reaches a plateau and stops. After that period, the subject below extreme altitude is able to perform his activities as if he were at sea level. The length of full hematological adaptation can be approximated by multiplying the altitude in kilometers by 11.4 days. For example, to adapt to 4000 m of altitude would require around 45 days.[15] However, no length of adaptation can allow humans to permanently live above 5,950 metres (19,520 ft).[7]
by Buz Groshong » Thu Sep 02, 2010 2:35 pm
jschrock wrote:Buz - I'd be curious to determine if those characteristics are genetic or individual adaptation.
Kinda cool if really the case either way though.
by rhyang » Thu Sep 02, 2010 3:09 pm
jschrock wrote:Oh...Rob I think we are talking about two different things. Length of time to acclimatize...and length of time for which the acclimatization lasts after the individual retuerns to low altitude.
I'm referring to the second. From your quote above it sounds like you are talking about the first.
by Buz Groshong » Thu Sep 02, 2010 3:59 pm
rhyang wrote:jschrock wrote:Oh...Rob I think we are talking about two different things. Length of time to acclimatize...and length of time for which the acclimatization lasts after the individual retuerns to low altitude.
I'm referring to the second. From your quote above it sounds like you are talking about the first.
I hear you, but my point is that for those of us who spend most of our time near sea level and get up to altitude for relatively brief periods, the adaptations made are different from those who are at higher altitudes for longer periods. Therefore, the amount of time to lose said adaptations is likely different. And I don't think anyone has actually answered the OP's question -- how long does it take to lose long-term acclimatization
by rhyang » Thu Sep 02, 2010 4:17 pm
Buz Groshong wrote:Actually, I think we (you and me) sort of did. If it takes 3 weeks for the body to produce the extra red blood cells that provide "long-term acclimatization," then it possibly takes about 3 weks for the process to reverse itself. On the other hand, if the body does grow additional capillaries in response to lower air pressure, it's not likely that this "long-term acclimatization" would ever be lost.
by madeintahoe » Thu Sep 02, 2010 5:39 pm
by Buz Groshong » Thu Sep 02, 2010 6:54 pm
jschrock wrote:Oh...Rob I think we are talking about two different things. Length of time to acclimatize...and length of time for which the acclimatization lasts after the individual retuerns to low altitude.
I'm referring to the second. From your quote above it sounds like you are talking about the first.
Anyway...this has about run its course...my eyes are glazing over now.
by Sierra Ledge Rat » Wed Sep 08, 2010 11:33 am
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