Along the lines of the recent “screaming in pain” question. Why, when in long-term pain, does it feel better or soothing to quietly moan? I’m talking aches, or chronic pain flairs, etc, rather than acute sudden pain. Does it have to do with lengthening exhalation duration?
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Not an expert, but I would assume it’s because moaning (edit. And also breathing deeply) causes vibration (and tension when breathing) inside the chest/throat that it stimulates the vagus nerve.
Stimulting vagus nerve causes relaxation of the body thru diff. effects (slower/regulated heart rate, relaxed lungs, releases tension in neck, etc).
Stimulating vagus nerve is what people with panic attack/anxiety do to get out of their panic attack. Yogi (the yoga instructors) practice multiple vagal exercise that mostly involves breathing exercise, and humming.
But like I said, I’m not an expert so feel free to negate or support this claim.
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