Madhavan C, Rajesh Jeniton Fernando, Ravichandran Kandasamy, Subhasis Das


Unilateral forced nostril breathing can influence the autonomic nervous system. The aim of the present study was to
evaluate the influence of left unilateral forced nostril breathing practice of 2 minutes for one week on the cardio-vagal
activity. The cardiovagal activity was studies before and after the breathing practices among 50 men in the age group between 18 and 30 years. The
battery of autonomic test performed was resting heart rate, E:I ratio, Valsalva ratio and 30:15 ratio for standing. Paired “t” test and Wilcoxon signed
ranked test was performed for parametric and non-parametric data respectively. All the autonomic tests reflected increased vagal activity which
were statically significant (p<0.001). Our study supports the hypothesis that by manipulating the nasal cycle the autonomic activity can be altered.
Further research in unilateral forced nostril breathing can help patients with dysautonomia.


Unilateral nostril breathing; Autonomic function test; Valsalva ratio; Yoga breathing technique; Vagal tone.

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