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I figure this is a rather strange question, however, I noticed this quite some time ago and wanted to make sure that this is in fact a permanent condition before posting.

The situation is as follows:

Whenever I put in both my in-ear headphones I notice that my nasal breathing resistance increases by quite a bit after some seconds have passed. The effect reverts itself about 30 seconds past removing the in-ear headphones.

Fellow divers will know how differences in breathing resistance feel like, as you can adjust it on most regulators, but for everyone else you could try breathing through a straw or something (though it's not that extreme).

The oral breathing resistance is not affected however.

My nasal breathing resistance is also not increased when wearing only one in-ear bud or using a normal headset (like with a frame, etc.).

Basically the increased breathing resistance leads to a feeling of not "having enough air" and is rather displeasing. It is not as bad as suffocating, but like halfway between breathing normally and drowning.

Does anyone know of such a phenomenon or what causes it?

Thinking about it, I think the whole thing started after I got into diving a couple of years back.

Could it be an unconscious reaction to the auditory canal being sealed off or something? Or an unconscious activation of my "diving mode"?

I remember that I never had any problems "closing off" my nasal breathing when being underwater and not having a mask on, I just automatically switched to oral breathing (which I never use in daily life, except when doing sports). The instructor said that this was rather uncommon and that most people have to actively force themselves to not breathe though the nose when diving without a mask (at least at the beginning).

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closed as too broad by kmm Dec 3 at 13:50

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

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Are you asking about direct physiological mechanisms (dual ear buds makes it physically more difficult to breathe) or a psychological effect (perceiving that it's more difficult to breathe)? –  kmm May 13 at 17:39
    
Well, I guess it's a physical effect. I don't think you can imagine your breath resistance getting higher, especially only the nasal one. –  daZza May 13 at 18:26
    
The tympanum completely closes off the auditory canal, so there isn't any air flowing through (unless you have a perforated eardrum). So I can't see how there can be a physical effect. –  kmm May 13 at 18:37
    
I do think you can imagine something like this - closely related to the placebo effect. Or did you physically measure a significant change? –  Volker Siegel Jul 24 at 8:58