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  #16  
Old 06-19-2021, 09:48 PM
jpd jpd is offline
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Tom Cruise tried that in Mission Impossible....
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  #17  
Old 06-20-2021, 06:57 AM
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Quote:
Originally Posted by jpd View Post
Tom Cruise tried that in Mission Impossible....
Yes ,,, And in a swirling toilet bowl
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  #18  
Old 06-20-2021, 07:14 AM
Shepsdad Shepsdad is offline
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I know that someone who is submerged in frigid water can be revived with minimal brain damage, but purposely holding your breath that long just can’t be good for you, there has to be some kind of damage it would seem. But, I’m no doctor, so what do I know…..
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  #19  
Old 06-20-2021, 03:43 PM
frankmcr frankmcr is offline
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This story by Erin Beresina of Outside magazine (05/09/2013) provides some information on technique etc. The online version of this had ads which made it hard to read, so I'm copy/pasting the relevant part:

"humans set breath-holding records in water because they “can hold their breath twice as long underwater they can on land.” The reason: the “diving reflex,” in which the body slows its heart rate and metabolism in order to conserve oxygen and energy when submerged in cold water. The pulse rate in an untrained diver, the Daily Mail says, will decrease 10 to 30 percent when underwater. But professional divers can reduce theirs by more than 50 percent.

Which brings us to records. The event in question—holding one’s breath underwater for as long as possible without moving—is officially called “static apnea,” and there are two ways static apnea records are kept: for dives performed after breathing in pure oxygen, and for dives performed without pure oxygen.

The Guinness Book of World Records allows divers to hyperventilate for up to 30 minutes with pure oxygen before they submerge for their record attempt. This practice, Discovery News reports, helps the body expel carbon dioxide, buying time before carbon dioxide levels become toxic. Boosting oxygen stores, on the other hand, buys time before oxygen levels fall too low, which leads to brain and tissue damage.

...

The International Association for the Development of Apnea, which records all freediving world records, does not allow the use of pure oxygen before a static apnea attempt. The current non-oxygen aided records stand at 11 minutes, 35 seconds for men (Stéphane Mifsud, 2009) and 8 minutes, 23 seconds for women (Natalia Molchanova, 2011).

Severinsen has said that he hasn’t suffered any brain damage from his breath-holding record attempts. Still, Discovery News notes, “studies of freedivers have turned up abnormalities in brain scans and markers that suggest brain damage. No one knows what the long-term consequences will be of feats like these.”
"
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Last edited by frankmcr; 06-20-2021 at 03:48 PM.
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  #20  
Old 06-20-2021, 07:59 PM
Sage97 Sage97 is offline
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Wow. I would’ve thought it would be David Blaine.
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  #21  
Old 06-21-2021, 01:12 PM
Dru Edwards Dru Edwards is offline
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That's great info. I figured that oxygen was taken prior to the event but I didn't know about the "diving reflex".

Quote:
Originally Posted by frankmcr View Post
This story by Erin Beresina of Outside magazine (05/09/2013) provides some information on technique etc. The online version of this had ads which made it hard to read, so I'm copy/pasting the relevant part:

"humans set breath-holding records in water because they “can hold their breath twice as long underwater they can on land.” The reason: the “diving reflex,” in which the body slows its heart rate and metabolism in order to conserve oxygen and energy when submerged in cold water. The pulse rate in an untrained diver, the Daily Mail says, will decrease 10 to 30 percent when underwater. But professional divers can reduce theirs by more than 50 percent.

Which brings us to records. The event in question—holding one’s breath underwater for as long as possible without moving—is officially called “static apnea,” and there are two ways static apnea records are kept: for dives performed after breathing in pure oxygen, and for dives performed without pure oxygen.

The Guinness Book of World Records allows divers to hyperventilate for up to 30 minutes with pure oxygen before they submerge for their record attempt. This practice, Discovery News reports, helps the body expel carbon dioxide, buying time before carbon dioxide levels become toxic. Boosting oxygen stores, on the other hand, buys time before oxygen levels fall too low, which leads to brain and tissue damage.

...

The International Association for the Development of Apnea, which records all freediving world records, does not allow the use of pure oxygen before a static apnea attempt. The current non-oxygen aided records stand at 11 minutes, 35 seconds for men (Stéphane Mifsud, 2009) and 8 minutes, 23 seconds for women (Natalia Molchanova, 2011).

Severinsen has said that he hasn’t suffered any brain damage from his breath-holding record attempts. Still, Discovery News notes, “studies of freedivers have turned up abnormalities in brain scans and markers that suggest brain damage. No one knows what the long-term consequences will be of feats like these.”
"
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