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Old 05-08-2011
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Lungs How to hold your breath for a longer time

If you want to hold your breath longer underwater, take a deep breath in and then right before you go under, take a quick breath out.

Why would you want to exhale before going underwater?
It has to do with expiratory flow rate. The larger the radius of our conducting airways, the greater the expiratory flow rate (same concept as in blood flow as resistance is inversely proportional to the radius to the fourth power). So if we take a quick breath out before we go underwater, we remove some of the air from our conducting airways (air in anatomical dead space). This air cannot participate in gas exchange anyway so by removing this air, you are decreasing the radius of your conducting airways, thus increasing resistance to expiration. This decreases expiratory flow rate so you can hold your breath for a longer time!!
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Old 05-08-2011
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Haha, you watched the Kaplan guy explain it?
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Old 05-08-2011
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Yup, didnt understand it the first time though. finally clicked after i got a question wrong related to the concept
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Old 05-08-2011
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Haha, that's exactly what I was thinking. That kaplan did explain this! But yeah, this is interesting because I would hve never thought of expiring before going under water.
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Old 05-08-2011
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Quote:
Originally Posted by eesfee View Post
Haha, that's exactly what I was thinking. That kaplan did explain this! But yeah, this is interesting because I would hve never thought of expiring before going under water.
I remembered this concept by imagining myself on a plane that's about to go down and we have to jump off into the ocean hehe (I cant swim so gotta get as much air in as possible)
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Old 05-09-2011
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You can also try hyperventilating before taking the deep breath in.

Why?

The reason we start to breathe again after a long period of time holding our breath is because of hypercapnia (not hypoxia). If you hyperventilate right before taking a deep breath then you start with a much lower baseline CO2 and therefore it takes a longer period of time for your CO2 to reach the threshold that would make you instictively take that first breath in. I have managed to reduce my sats down to low 60s by doing this.
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Old 05-09-2011
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It's true that dead space volume does not participate in the gas exchange but when you exhale this volume, it will be replaced by the air in the alveolar space. so finally you are decreasing the alveolar volume which does not result in staying longer time underwater.

But there might be another mechanism involved, I think the long volume just a little bit under the TLC helps you have a better blood perfusion to the longs.

What you think?
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Old 11-13-2011
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Wink Used by swimmers too

This is even used by professional swimmers to hold their breath underwater for long so that they don't have to waste time in taking breaths repeatedly. Those of you who swim will easily understand that when we exhale air inside water through our nose after taking a breath outside water through our mouth it makes you hold your breath for long.

I have been an avid swimmer and have always used this during swimming without ever knowing why but thanks to Kudrath i now know why
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