Jerath, R., Edry, J. W., Barnes, V. A., & Jerath, V. (2006). Physiology of long pranayamic breathing: neural respiratory elements may provide a mechanism that explains how slow deep breathing shifts the autonomic nervous system. Medical Hypotheses, 67, 3, 566-571.
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Mozer, M., Fade, P., Johnson, C., Wallin, B., Charkoudian, N., Drobish, J., Joyner, M., & Wehrwein, E. (2014). Acute slow-paced breathing increases period of sympathetic nervous system quiescence. The Journal of the Federation of American Societies for Experimental Biology, 28, 1, Sup. 1170.12.

Russell, M. (2014). Diaphragmatic breathing and its effect on inhibitory control. Thesis and Dissertations – Psychology. Paper 53.

Here’s one of the earliest scientific studies exploring the effect of left nostril breathing:
Telles, S., Nagarathna, R., & Nagendra, H. R., (1994). Breathing through a particular nostril can alter metabolism and autonomic activities. Indian Journal of Physiology and Pharmacology, 38, 2, 133-7.

Here’s a lovely easy-to-read study comparing nadi shodhana (our alternate nostril breathing technique) with general ‘breath awareness’:
Telles, S., Yadav, A., Kumar, N., Sharma, S., Visweshwarajah, N. K., Balkrishna, A. (2013). Blood pressure and Purdue pegboard scores in individuals with hypertension after alternate nostril breathing, breath awareness, and no intervention. Medical Science Monitor, 21, 19, 61-66.
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