Long exhalation and the vagus nerve: what’s known and what’s hype
Does a long out-breath really “activate” your vagus nerve? What studies show about exhalation and HRV, and where polyvagal and gadget claims go too far.
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Liu Zi Jue: where the Six Healing Sounds come from
Where do the Six Healing Sounds come from? The earliest text, its uncertain date, changing organ pairings and the 2003 standard form of Liu Zi Jue.
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Slow breathing and heart rate variability: what actually happens in your body
At about six breaths a minute, your heart rate swings most with each breath. What studies show about slow breathing and HRV, and what they don’t.
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Humming and nitric oxide in the nose
In small lab studies, humming briefly raised nitric oxide in the nose about 15-fold. What this shows, what it does not, and how it relates to qigong.
