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Why this, and its limits
Slow breathing (under 10 per minute, especially around 6) raises heart-rate variability and lowers anxiety in research (Zaccaro et al., 2018 review). Effects are moderate and clearest during the session. If you feel dizzy, return to normal breathing. The rhythm is close to that of anulom-vilom.
References: Zaccaro et al. 2018, slow breathing review
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