Mymensingh medical journal : MMJ
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Observational Study
Acute Effects on Heart Rate Variability during Slow Deep Breathing.
Slow deep breathing is known to modulate cardiovascular control and is a used in many ancient breath control practices like pranayama. The changes in Heart Rate Variability (HRV) during a less known form of Slow Deep Breathing (SDB) with equal counts of inhalation, holding and exhalation are not well documented. This study analyses the changes during such a slow deep breathing pattern with less than 4 breaths per minute on HRV. ⋯ Practice of pranayama naturally slows the breathing, which in turn makes the heart calmer and calmer as demonstrated by a statistically significant decrease in heart rate after five minutes of SDB. Transient and rapid excitation of cardiovascular system during SDB suggests that the multiple regulatory mechanism at play like mechanical coupling, baroreflex and central mechanisms. Slow yogic breathing (pranayama) may serve as a physiologic method to draw upon cardio-vagal reserve and regular practice of these manoeuvres may beneficially affect cardiovascular autonomic regulation in health and in various cardiovascular diseases.