Skydivers and the need to breathe.

[VanLandry]

I was fliping through the channels on t.v. recently and came across a show that was doing a piece on skydivers. It said that because skydivers move through so much air at such a rapid pace, that their bodies absorb enough oxygen through their skin and there is no need for them to breathe.
Now, I realize that our skin can indeed absorb gases in from the air, but I don't believe for a second that skydivers dont have to breathe normally. Besides, most of their skin is covered up anyway and I sure as hell would'nt believe a nude skydiver. Is there any truth to this claim? Has it been documented?

[Arjuna34]

According to Cecil, we don't breathe through our skin:

If you were painted gold, as in the movie "Goldfinger," would you die? (http://www.straightdope.com/classics/a1_221b.html)


Well, science--or at least the popular understanding of it--has made mighty strides since those early years, and it is now known that you do not breathe through your skin. You breathe through your mouth and nose.


Arjuna34

[Johnny L.A.]

http://boards.straightdope.com/sdmb/showthread.php?threadid=5651
http://boards.straightdope.com/sdmb/showthread.php?threadid=10641

[Duck Duck Goose]

Well, just because I was curious, I went and looked up just how fast a skydiver is going.

http://www.geocities.com/Pipeline/Ramp/9919/speed.html
When a jumper leaves the aircraft, he/she is moving at the same speed as the aircraft (typically 90-110 MPH). During the first 10 seconds a skydiver accelerates up to about 115-130 MPH straight down. By diving or "standing up" in freefall, an experienced skydiver can reach speeds of 160-180 MPH. The record freefall speed without any special equipment is 321 MPH. Under a parachute, decent rates of 1000 feet per minute are typical1.

And a simple Google search under "breathe freefall" brought up lots and lots of hits. Among others...

http://www.soyouwanna.com/site/syws/skydiving/skydiving.html
MYTH: You can't breathe during freefall.
FACT: Contrary to popular belief, you can breathe during freefall. Otherwise, skydivers would be unconscious before they get the chance to open their parachutes . . . making skydiving a much messier sport.

MYTH: Freefalls can last five minutes.
FACT: Most skydiving planes cruise at about 10,000 - 12,000 feet. This means that you have about 35 seconds of freefalling before you open your parachute. To fall for five minutes, you'd have to go up to 60,000 feet (and bring extra oxygen for the plane ride). Yes, that means you can't pull out the emergency exit and jump out of a cruising 747 the next time you're scared of turbulence.

http://www.skydiveperris.com/sfaq.asp#q13
Can you breathe in freefall?

Absolutely! Due to the rush of air experienced, along with the rush of adrenaline, people sometimes feel they will be unable to breathe. Relax and breathe normally. It's just air up there!
And I'm sorry, but I can't help it. There are evidently people out there who really believe you can breathe through your skin. The rest of this website is, as far as I can tell, absolutely 100% on-the-money skydiving info.

http://www.skyranch.com/faq.htm#whuffo
One CAN breathe in freefall - if it were necessary. However, due to the high speed of terminal freefall (and much higher speeds in vertical freefall dives), the jumper's body is exposed to O2 molecules at a much higher rate than someone walking around on the ground. The body is able to absorb the necessary O2 through the skin. This is why jumpers flap their cheeks in freefall, it presents a larger surface area to the airstream for oxygen osmosis. Once under canopy, the jumper resumes breathing normally.
This is also why jumpers do not jump on cloudy days or when they might risk going through clouds. The moisture in the clouds can condense on their exposed skin surfaces preventing the absorption of the necessary oxygen resulting in suffocation. AADs are recommended for jumpers in climates where weather is a factor.

And, dammit, here's another one. Who ARE these people?
http://www.geocities.com/Pipeline/Curb/3670/questions.html
Can I breathe in freefall?
You don't have to! While in freefall, your pores act like the gills of the fish, absorbing air and making it unnecessary to breathe.

Okay, so now I'm mad. This is deeply stupid. I'm gonna go find out whether you can in fact absorb oxygen through your skin.

http://www.o2facial.com/foot.html
(You may have seen advertisements for devices that encase a person's leg and deliver oxygen to the skin. This is not hyperbaric oxygen therapy, and it's not effective—your skin doesn't absorb oxygen that way.
No.

http://www.drweil.com/qa_print/0,3008,1832,00.html
Several of my friends are raving about oxygen facials and what they do for the skin and the psyche. Anything to it?

Sounds good, but there's no scientific evidence to support these claims.
No.

So where is this "you can absorb oxygen through your skin" factoid coming from, anyway? Answer--oxygen facials. Cosmetics with "oxygen" in them. "Oxygenating" body washes. None of these do a thing besides fatten the wallet of the manufacturer.

Mammals cannot absorb oxygen through their skin. Mammals have dry skin. Amphibians and worms have wet skin, to facilitate the absorption of oxygen through the capillaries in their skin. It doesn't work with dry skin.

And if whales, porpoises, and orcas could absorb oxygen through their skin, they wouldn't need lungs. A search for "dolphins absorb oxygen skin" brings up nothing relevant.

Amphibians have lungs anyway--absorbing oxygen through their skin is just a supplement. Mammals have much more efficient lungs, and much more efficient four-chambered hearts to pump blood through them--we don't need to absorb oxygen through our skin.

And then, just as I'm winding down, up pops a website that claims humans use 2% of their skin for breathing. Gloriosky. :rolleyes:
http://www.saburchill.com/chapters/chap0022.html

There's a table that also says brown bats use 12% of their skin for breathing, and that boa constrictors use 21%. It goes on to say,
The main disadvantage of breathing through the skin is that the animal loses a lot of water in this way. The skin of these animals is always wet. To stop their bodies from drying out they must always live where the air is humid.

This applies to amphibians and worms, yes, but not humans or bats.

Okay, I'm game. However, a search under "brown bat oxygen skin" turns up nothing relevant. Ditto a search for "boa constrictor oxygen skin".

So.

Okay, people, for the last time:

Salamanders (http://www.alienexplorer.com/ecology/p144.html) can absorb oxygen through their skin.
Frogs (http://www.lookd.com/frogs/anatomy.html) can absorb oxygen through their skin.
Earthworms (http://www.nysite.com/nature/fauna/earthworm.htm) can absorb oxygen through their skin.

Not people. Mammals cannot absorb oxygen through their skin.

The reason you don't suffocate in freefall is because it's only 35 seconds long, and you can certainly hold your breath for that long if going 150 mph makes it physically difficult for you to breathe.

[Fyodor]

I have a life total of about four minutes spent in freefall and there are dedicated skydivers out there with hours of freefall time. My longest freefall was 35 seconds and I just breathed normally through my nose as I admired the view. (After 35 seconds the ground was a lot closer than when I rolled out the door of the airplane.) It's been a few years but I don't remember any problems whatsoever breathing and I don't recall any discussion in skydiving circles about breathing problems. I do remember the need to wear goggles, though. The high wind speed beats your eyelashes against your eyeballs and can cause scarring that will affect your vision.
This "breathing through your skin" stuff sounds totally nuts to me.

[Darqangelle]

Cover your Mouth and nose with duct tape.

Make certain you have the nostrils and mouth completely covered.

Leave it on, because if you can breath through your skin, you WILL NOT suffocate, right?


:rolleyes:


I'm a skydiver. What I can tell you is, it's really really windy. Other than that, no problem. Just breathe as you usually do.

As for those who believe they can breathe through the skin, I suggest they try the above test once again...because they obviously didn't get the right results the first time.



"Be sure to get your WHOLE head in front of the shotgun. Thank you for calling." -Denis Leary