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viperdoc(at)mindspring.co
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 Posted: Mon Jun 27, 2011 5:39 pm Post subject: G Tolerance and Hydration |
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All,
This is a topic I intended to present to the Red Star Rag for the summer edition but too many irons in the fire prevented getting the message out.
Basically Summer is here. It is hot on the ramp and we are going to sweat. Remember to hydrate early and hydrate often. Beer, whiskey, coffee, tea, and soft drinks containing caffeine is not hydrating. They are dehydrating.
In the summer sun you lose approximately 1 pound of water an hour. When you are walking across the ramp drinking a cool looking pint bottle of Desani or Avian for the first time of the day after being on the ramp for 3 hours you are behind the power curve already. Your blood volume is down 48 oz.(1500 mls), Slugging down that 16 oz. (~500 mls) of bottle of water walking to the jet for the first flight of the show you are behind. Now that bottle of water you just sucked down is going to take almost 45 minutes to be absorbed by your GI tract into your blood stream. The average 70 kg human has roughly 5 liters of blood volume (~ 160 oz.). So you are starting your routine in the heat roughly 48 oz or ~ 1500 mls down. With the water volume down in the vascular system, the blood is thicker and therefore it flows slower therefor it is harder for your heart to pump out of the extremities up to the brain under G. If your starting blood volume is down 1500 ml, you are starting your routine with an approximate 30% to 40% lower G tolerance than a hydrated pilot.
So if your basic hydrated G tolerance is 6 to 7 Gs without experiencing gray out, a 30 to 40% loss of G tolerance due to dehydration means you are roughly a 5 G man now. Basically dehydration robs you of 1.5 to 2 G’s after 3 to 4 hours in the sun on the ramp.
Bottom line, stay in a cool shaded place as long as possible, drink water till you slosh, and if you are peeing yellow with a slight headache you are DRY (hypovolemic)and you are at risk for G lock.
Doc
[quote][b]
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cjpilot710(at)aol.com
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| Posted: Mon Jun 27, 2011 5:50 pm Post subject: G Tolerance and Hydration |
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EXCELLENT ADVISE DOC. THANKS
In a message dated 6/27/2011 9:39:40 P.M. Eastern Daylight Time, viperdoc(at)mindspring.com writes:
| Quote: |
All,
This is a topic I intended to present to the Red Star Rag for the summer edition but too many irons in the fire prevented getting the message out.
Basically Summer is here. It is hot on the ramp and we are going to sweat. Remember to hydrate early and hydrate often. Beer, whiskey, coffee, tea, and soft drinks containing caffeine is not hydrating. They are dehydrating.
In the summer sun you lose approximately 1 pound of water an hour. When you are walking across the ramp drinking a cool looking pint bottle of Desani or Avian for the first time of the day after being on the ramp for 3 hours you are behind the power curve already. Your blood volume is down 48 oz.(1500 mls), Slugging down that 16 oz. (~500 mls) of bottle of water walking to the jet for the first flight of the show you are behind. Now that bottle of water you just sucked down is going to take almost 45 minutes to be absorbed by your GI tract into your blood stream. The average 70 kg human has roughly 5 liters of blood volume (~ 160 oz.). So you are starting your routine in the heat roughly 48 oz or ~ 1500 mls down. With the water volume down in the vascular system, the blood is thicker and therefore it flows slower therefor it is harder for your heart to pump out of the extremities up to the brain under G. If your starting blood volume is down 1500 ml, you are starting your routine with an approximate 30% to 40% lower G tolerance than a hydrated pilot.
So if your basic hydrated G tolerance is 6 to 7 Gs without experiencing gray out, a 30 to 40% loss of G tolerance due to dehydration means you are roughly a 5 G man now. Basically dehydration robs you of 1.5 to 2 G’s after 3 to 4 hours in the sun on the ramp.
Bottom line, stay in a cool shaded place as long as possible, drink water till you slosh, and if you are peeing yellow with a slight headache you are DRY (hypovolemic)and you are at risk for G lock.
Doc
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[quote][b]
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keithmckinley
Joined: 11 Aug 2008
Posts: 434
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| Posted: Mon Jun 27, 2011 8:16 pm Post subject: Re: G Tolerance and Hydration |
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Doc,
Is there any benefit or detriment drinking gatorade or something similar?
K
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Mon Jun 27, 2011 8:28 pm Post subject: G Tolerance and Hydration |
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water
On Jun 28, 2011, at 12:16 AM, keithmckinley wrote:
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CD 2.0
Joined: 21 Feb 2011
Posts: 43
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| Posted: Tue Jun 28, 2011 12:21 am Post subject: Re: G Tolerance and Hydration |
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The difference between water and gatorade is sugar, salt, and some flavoring. Gatorade has electrolytes, which basically helps to replenish the body's salt that it has lost during sweating at high temperatures. Most people do not need electrolytes because they have a high intake of salt in their diet. Water is best, unless your salt levels become to low usually for working out.
But on the other hand, as Doc pointed out "it takes 45 minutes to get absorbed into your blood stream" Gatorade could be better than water for hydration, simply because it is slightly salty and therefore makes the person thirsty and keeps them drinking to replenish the electrolytes, salts and so on. Water does not do this.
With water, once a person feels thirsty, it is too late, they are already dehydrated but if you are able to drink often, I would recommend water, and lots of it.
Carl
| keithmckinley wrote: | Doc,
Is there any benefit or detriment drinking gatorade or something similar?
K |
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rick(at)rvairshows.com
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| Posted: Tue Jun 28, 2011 3:16 am Post subject: G Tolerance and Hydration |
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Increased core body temperature decreases G tolerance also, with Nomex Flight suits and helmets both subtracting from your normal tolerance. This is just another reason to keep hydrating and hide out in the air conditioned fbo until your flight time .
Rick VOLKER
Sent from my iPhone
On Jun 27, 2011, at 9:36 PM, "Roger Kemp M.D." <viperdoc(at)mindspring.com (viperdoc(at)mindspring.com)> wrote:
[quote]
All,
This is a topic I intended to present to the Red Star Rag for the summer edition but too many irons in the fire prevented getting the message out.
Basically Summer is here. It is hot on the ramp and we are going to sweat. Remember to hydrate early and hydrate often. Beer, whiskey, coffee, tea, and soft drinks containing caffeine is not hydrating. They are dehydrating.
In the summer sun you lose approximately 1 pound of water an hour. When you are walking across the ramp drinking a cool looking pint bottle of Desani or Avian for the first time of the day after being on the ramp for 3 hours you are behind the power curve already. Your blood volume is down 48 oz.(1500 mls), Slugging down that 16 oz. (~500 mls) of bottle of water walking to the jet for the first flight of the show you are behind. Now that bottle of water you just sucked down is going to take almost 45 minutes to be absorbed by your GI tract into your blood stream. The average 70 kg human has roughly 5 liters of blood volume (~ 160 oz.). So you are starting your routine in the heat roughly 48 oz or ~ 1500 mls down. With the water volume down in the vascular system, the blood is thicker and therefore it flows slower therefor it is harder for your heart to pump out of the extremities up to the brain under G. If your starting blood volume is down 1500 ml, you are starting your routine with an approximate 30% to 40% lower G tolerance than a hydrated pilot.
So if your basic hydrated G tolerance is 6 to 7 Gs without experiencing gray out, a 30 to 40% loss of G tolerance due to dehydration means you are roughly a 5 G man now. Basically dehydration robs you of 1.5 to 2 G’s after 3 to 4 hours in the sun on the ramp.
Bottom line, stay in a cool shaded place as long as possible, drink water till you slosh, and if you are peeing yellow with a slight headache you are DRY (hypovolemic)and you are at risk for G lock.
Doc
[b]
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dsavarese0812(at)bellsout
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| Posted: Tue Jun 28, 2011 3:52 am Post subject: G Tolerance and Hydration |
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Thanks Doc. Excellent advice, as always.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 6/27/2011 8:36 PM, Roger Kemp M.D. wrote:
| Quote: |
All,
This is a topic I intended to present to the Red Star Rag for the
summer edition but too many irons in the fire prevented getting the
message out.
Basically Summer is here. It is hot on the ramp and we are going to
sweat. Remember to hydrate early and hydrate often. Beer, whiskey,
coffee, tea, and soft drinks containing caffeine is not hydrating.
They are dehydrating.
In the summer sun you lose approximately 1 pound of water an hour.
When you are walking across the ramp drinking a cool looking pint
bottle of Desani or Avian for the first time of the day after being on
the ramp for 3 hours you are behind the power curve already. Your
blood volume is down 48 oz.(1500 mls), Slugging down that 16 oz. (~500
mls) of bottle of water walking to the jet for the first flight of the
show you are behind. Now that bottle of water you just sucked down is
going to take almost 45 minutes to be absorbed by your GI tract into
your blood stream. The average 70 kg human has roughly 5 liters of
blood volume (~ 160 oz.). So you are starting your routine in the heat
roughly 48 oz or ~ 1500 mls down. With the water volume down in the
vascular system, the blood is thicker and therefore it flows slower
therefor it is harder for your heart to pump out of the extremities up
to the brain under G. If your starting blood volume is down 1500 ml,
you are starting your routine with an approximate 30% to 40% lower G
tolerance than a hydrated pilot.
So if your basic hydrated G tolerance is 6 to 7 Gs without
experiencing gray out, a 30 to 40% loss of G tolerance due to
dehydration means you are roughly a 5 G man now. Basically dehydration
robs you of 1.5 to 2 G’s after 3 to 4 hours in the sun on the ramp.
Bottom line, stay in a cool shaded place as long as possible, drink
water till you slosh, and if you are peeing yellow with a slight
headache you are DRY (hypovolemic)and you are at risk for G lock.
Doc
*
*
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viperdoc(at)mindspring.co
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| Posted: Tue Jun 28, 2011 4:28 am Post subject: G Tolerance and Hydration |
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Sugar equals osmotic diuretic. Water contains enough salt (sodium Chloride)
and KCl (potassium chloride) by the simple filtration process in the water
treatment facilities. If you want to flavor the water with something like
gatorade dilute it 50%.
Gatorade and such have been removed from the military flight lines for at
least 15 years if my memory serves correctly. The recommendation was if the
troops wanted to use for flavoring then it dilute it.
IF you ever get the chance sample your infant's pedialyte, it has any
flavor. The electrolyte concentration s is essentially physiologic in
concentration. Giving sugar containing fluids can result in greater
dehydration because of the osmotic diuretic effect of the sugar not allowing
water to be absorbed.
Sorry gotta go to the OR can't expound any farther.
Wow, did not mean to stir this topic up...sugars and osmosis.
Doc
--
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yakplt(at)yahoo.com
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| Posted: Tue Jun 28, 2011 11:22 am Post subject: G Tolerance and Hydration |
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Brian Lloyd <brian(at)lloyd.com> wrote:
"Didn't we have an argument about nomex about 10 years ago?  "
Not that I remember ......
mgb
WA3JPY/A92FL
--- On Tue, 6/28/11, Brian Lloyd <brian(at)lloyd.com> wrote:
| Quote: |
From: Brian Lloyd <brian(at)lloyd.com>
Subject: Re: G Tolerance and Hydration
To: yak-list(at)matronics.com
Date: Tuesday, June 28, 2011, 2:56 PM
On Tue, Jun 28, 2011 at 4:13 AM, RICHARD VOLKER <rick(at)rvairshows.com (rick(at)rvairshows.com)> wrote:
| Quote: | Increased core body temperature decreases G tolerance also, with Nomex Flight suits and helmets both subtracting from your normal tolerance. This is just another reason to keep hydrating and hide out in the air conditioned fbo until your flight time .
Rick VOLKER
|
And then one could wear shorts and Hawaiian shirts to help out as well. Didn't we have an argument about nomex about 10 years ago?
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian(at)lloyd.com (brian(at)lloyd.com)
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
| Quote: |
et=_blank rel=nofollow>http://www.matronics.com/Navigator?Yak-List
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[quote][b]
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dave(at)davelaird.com
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brian(at)lloyd.com
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| Posted: Tue Jun 28, 2011 3:04 pm Post subject: G Tolerance and Hydration |
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On Tue, Jun 28, 2011 at 3:13 PM, Dave Laird <dave(at)davelaird.com (dave(at)davelaird.com)> wrote:
| Quote: | --> Yak-List message posted by: Dave Laird <dave(at)davelaird.com (dave(at)davelaird.com)>
I remember Brian. I think I saved them because I was so amused. I'm sure they are in the archives for the newbies around here...
|
What can I say. I am just a contrary individual.
And for the noobs on here, I was the guy who started the Yak list about 13 years ago or so.
| Quote: | -Dave Laird
N63536 1983 CJ6A "Betty"
Dallas (ADS) - Austin(EDC)
p.s. hey Brian, Betty sez hi!
|
Hi back. Wish I had her now.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian(at)lloyd.com (brian(at)lloyd.com)
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
[quote][b]
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