Yawning during the last deep breaths ??????

[efattah]

I always wait for the yawn before starting a dive. I try to start my dive immediately afterwards. It may be a sign of mild hypocapnia, who knows, but whatever it is, it is an awesome feedback mechanism for me, to tell me when the breathe-up is over. It is like a clockwork mechanism to indicate your CO2 level. If I start the dive right after the first yawn, the mechanics/feeling of the dive are the same every time. If I start the dive without a yawn or long after, the dive has a random result. So if nothing else it helps with consistency.

I know Trevor Hutton also likes to yawn just before diving (and he caught a fish at 60m...)

If I come up from a pretty deep recreational dive, and want to quickly go down again, the yawn requirement prevents me from starting the dive too early. There is no way to speed up the appearance of the yawn.

 

[ktreloar]

hmm quite interesting i to yawn a fair bit during the breathe up, but i can almost guarrantee that i dont hyperventilate. My breathe up actually restricts my normal tidal breathing a little. Due to diving on FRC i need a bit of C02 before the dive to make it work, usually i take to last full breathes then go. I think it just comes down to the individual and also that yawning it self has alot of triggers. From my understanding the dictionary states that any breathing outside of tidal is hyperventilation. If that be the case wouldnt restricted breathing fit into that category. From my understanding the the term hyperventilation covers different factors that could attribute to hyperventilation, again it comes down to the individual. So in a way yawning could just be a different part of the breathe up.

Cheers guys just added my 2 cents worth

Dive safe

Kyle Treloar

 

[efattah]

Breathing too little would be just as likely to cause a yawn as breathing too much.

 

[cdavis]

Very interesting thread indeed!

I don't yawn, but when everything gets right for a long comfortable dive (I'm diving FRC and doing a very minimal ventilation breathup) I get an extremely relaxed, almost zoned out, almost asleep feeling where I certainly could yawn. Think I'll experiment with this.

Somewhere back in history, I think I learned that yawning can be a symptom of high co2 levels. Not sure thats right, but it would fit.


Connor

 

[Tony Babowicz]

You guys are making me tired>zzz

 

[Johan Andersson]

Somewhere back in history, I think I learned that yawning can be a symptom of high co2 levels. Not sure thats right, but it would fit.

Connor

From a physiological point of view, the trigger for yawning is still poorly understood. There are a number of different hypothesis, but none is "proven".

See for instance here:
Why do we yawn? [Neurosci Biobehav Rev. 2010] - PubMed result

/Johan