It is both funny and strange, that after hearing this on a movie(which I assumed then, it's been added to make movie sound deeply scientific), about oxygen shortage in successive breaths affect person's voice properties like tone, intensity etc., when I searched for it, I did find that it has been experienced in reality.

So now my curiosity being heightened, I really need to know whether the shortage of breath/oxygen always causes a person's voice to change or it only occurs in some special circumstances ?

Moreover, what is the reason for this to happen ?

My question is based on this: https://pulmonaryhypertensionnews.com/forums/forums/topic/do-you-ever-notice-changes-in-your-voice/


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