Google Answers Logo
View Question
 
Q: Human physiology - G-forces ( No Answer,   3 Comments )
Question  
Subject: Human physiology - G-forces
Category: Health > Medicine
Asked by: elden-ga
List Price: $15.00
Posted: 04 Jun 2004 23:36 PDT
Expires: 04 Jul 2004 23:36 PDT
Question ID: 356707
Laying flat on his back with no activity to perform (physical or
cognitive), without sustaining any damage

a)How many g?s can a human withstand for 1 hour? Recovery Time?
b)How many g?s can a human withstand for 1 hour and fully recover in
less than 1 minute?
c)How many g?s can a human withstand for 30 minutes and fully recover
in less than 1 minute?
d)How long can a human withstand 25 g?s?
e)Would lying in a waterbed-like device increase his endurance?

Clarification of Question by elden-ga on 04 Jun 2004 23:47 PDT
On his back or face down or whatever postion that the most g's can be sustained

Clarification of Question by elden-ga on 10 Jun 2004 08:29 PDT
Fron the Paper suggested by dr_bob-ga
"3. Reclined Seat....tolerance becomes progressively limited by pain
from contact with the seat, from chest compression, and from
difficulty inhaling due to the increased weight of the anterior chest
wall. These symptoms limit this technique to about 14-15 G maximum..."

It would appear that:
1) a 'waterbed', or perhaps a stiffer version of the elastipfoam that
that you see on the TV bed commercials, would reduce or eliminate the
1st problem
2) that a forced air resporator could improve the 2nd and 3rd problem.
(similar to a C-PAP machine)
Answer  
There is no answer at this time.

Comments  
Subject: Re: Human physiology - G-forces
From: dr_bob-ga on 05 Jun 2004 15:22 PDT
 
Laying flat may be a bit of an issue, as most g-force machines use
centrifugal force to induce the g-forces.  Thus I'm not sure if you'll
be able to get a good answer.

While sitting, the principal cause of damage is lack of blood supply
to the brain.  Fighter Pilots typically wear a G-suit that consists of
a set of pressure coils(filled with gas or liquid) that constrict the
body(and blood vessels) in the legs, thus keeping blood supply to the
brain.

6 g's is pretty grumpy, 10 is downright evil, 25 methinks would hurt a lot.

Such a waterbed device would likely keep someone from going "squish"
at 25 G's maybe a little.
Subject: Re: Human physiology - G-forces
From: dr_bob-ga on 05 Jun 2004 15:44 PDT
 
This page has some useful info:

http://www.vnh.org/FSManual/02/02SustainedAcceleration.html

This was a good article too:

"By 1958, these studies had revealed that humans have the potential to
withstand 46 G and a force of 10,000 pounds for a quarter of a second,
forces that were well in excess of those anticipated for
spaceflight.19"

http://www.vnh.org/FSManual/02/02SustainedAcceleration.html
Subject: Re: Human physiology - G-forces
From: synarchy-ga on 07 Jun 2004 16:37 PDT
 
A waterbed will only cushion sudden changes in g-force (by deforming
to allow the body to essentially accelerate slower than the maximum
instantaneous acceleration) - sort of like a shock absorber - it will
take a little bump without a problem, but if you drive off a cliff it
really doesn't matter what kind of shocks you have.

Important Disclaimer: Answers and comments provided on Google Answers are general information, and are not intended to substitute for informed professional medical, psychiatric, psychological, tax, legal, investment, accounting, or other professional advice. Google does not endorse, and expressly disclaims liability for any product, manufacturer, distributor, service or service provider mentioned or any opinion expressed in answers or comments. Please read carefully the Google Answers Terms of Service.

If you feel that you have found inappropriate content, please let us know by emailing us at answers-support@google.com with the question ID listed above. Thank you.
Search Google Answers for
Google Answers  


Google Home - Answers FAQ - Terms of Service - Privacy Policy