Effect of yoga on autonomic functions in medical students: a pilot study


  • Shashikiran HC Department of Pathology, SDM College of Naturopathy and Yogic Sciences, Ujire, Dakshina Kannada, Karnataka
  • Prashanth Shetty Department of Natural Therapeutics, SDM College of Naturopathy and Yogic Sciences, Ujire, Dakshina Kannada, Karnataka
  • Chethan Kumar R Department of Yoga, Sri Dharmasthala Manjunatheshwara College of Naturopathy and Yogic Sciences, Dakshina Kannada, Karnataka
  • Shivaprasad Shetty Department of Yoga and Physical therapeutics, Sri Dharmasthala Manjunatheshwara College of Naturopathy & Yogic Sciences, Dakshina Kannada, Karnataka


Autonomic nervous system, Stress, Anxiety, Yoga


Background: Stress and anxiety being the major contributors of morbidity, leads to many chronic diseases and is known to invariably decrease the quality of life and even life span. Autonomic Nervous System (ANS), a part of the peripheral nervous system that controls the visceral system, functioning largely under the level of consciousness, capable of being influenced by the psychological factors and influences the physiological processes happening in the body.  Non-pharmacological therapies play a major role to relieve stress and anxiety of which yoga takes first place compared to pharmacological treatment. Present study adopts a systematic approach in comparing the effects of practicing yoga for one year with novices on autonomic and respiratory variables.

Methods: We recruited sixty subjects from the Sri Dharmasthala Manjunatheshwara College of Naturopathy & Yogic Sciences, Ujire and their mean age group is 18.8 ± 2.3 fulfilling the selection criteria, after they gave written consent to participate. They were divided into 2 groups based on their experience of practicing yoga. Each group consisted of 30 subjects. Group 1 includes participants with no experience in yoga (Novices group) and Group 2 (Yoga group) includes individuals with one year experience of practicing yoga. Each group consists of 17 males and 13 females respectively. The study was approved by the ethical review committee. Informed written consent was obtained from all subjects. All students were subjected to Onetime Assessment for autonomic variables and respiration at base line and during deep breathing.

Results: In our study we observed that there was a significant decrease in heart rate (P = 0.004***) following intervention in yoga group compared to novice group. There was a significant difference in Respiration rate (P = 0.003***) and Mean RR (P = 0.002***) which indicate increase parasympathetic activity in yoga group compared to novice group. There is also a significant difference in time domain parameter PNN50 (P = 0.030*) which is an indicator of parasympathetic activity. There was no significant difference in other time domain and frequency domain parameter.

Conclusion: Practicing yoga regularly for one year can reduce the physiological arousal and develops the ability to adapt to a demanding situation.



Goldstein DS. Neurotransmitters and stress. Biofeedback Self Regul. 1990;15:243-71.

McEwen BS. Protective and damaging effects of stress mediators: central role of the brain. Dialogues Clin Neurosci. 2006;8:367-81.

McEwen BS. Protective and damaging effects of stress mediators. N Engl J Med. 1998;338:171-9.

Suls J, Bunde J. Anger, anxiety, and depression as risk factors for cardiovascular disease: the problems and implications of overlapping affective dispositions. Psychol Bull. 2005;131:260-300.

Verkuil B, Brosschot JF, Meerman EE, Thayer JF. Effects of momentary assessed stressful events and worry episodes on somatic health complaints. Psychol Health. 2012;27(2):141-58.

Roure R, Collet C, Deschaumes-Molinaro C, Dittmar A, Rada H, Delhomme G, et al. Autonomic nervous system responses correlate with mental rehearsal in volleyball training. Eur J Appl Physiol Occup Physiol. 1998;78:99-108.

McCorry LK. Physiology of the autonomic nervous system. Am J Pharm Educ. 2007;71(4):78.

Li AW, Goldsmith CAW. The effects of yoga on anxiety and stress. Altern Med Rev. 2012;17:21-35.

Nagendra HR. Defining yoga. Int J Yoga. 2008;1:43-4.

Kauts A, Sharma N. Effect of yoga on academic performance in relation to stress. Int J Yoga. 2009;2:39-43.

Monk-Turner E, Turner C. Does yoga shape body, mind and spiritual health and happiness: Differences between yoga practitioners and college students? Int J Yoga. 2010;3:48-54.

Ramos-Jiménez A, Hernández-Torres RP, Wall-Medrano A, Muñoz-Daw MD, Torres-Durán PV, Juárez-Oropeza MA. Cardiovascular and metabolic effects of intensive Hatha Yoga training in middle-aged and older women from northern Mexico. Int J Yoga. 2009;2:49-54.

Yogitha B, Nagarathna R, John E, Nagendra H. Complimentary effect of yogic sound resonance relaxation technique in patients with common neck pain. Int J Yoga. 2010;3:18-25.

Radhakrishna S. Application of integrated yoga therapy to increase imitation skills in children with autism spectrum disorder. Int J Yoga. 2010;3:26-30.

Björntorp P. Visceral fat accumulation: the missing link between psychosocial factors and cardiovascular disease? J Intern Med. 1991;230:195-201.

Vadiraja SH, Rao MR, Nagendra RH, Nagarathna R, Rekha M, Vanitha N, et al. Effects of yoga on symptom management in breast cancer patients: A randomized controlled trial. Int J Yoga. 2009;2:73-9.

Sims J. The evaluation of stress management strategies in general practice: an evidence-led approach. Br J Gen Pract. 1997;47:577-82.

Atkinson NL, Permuth-Levine R. Benefits, barriers, and cues to action of yoga practice: a focus group approach. Am J Health Behav. 2009;33:3-14.

Kothari LK, Bardia A, Gupta OP. The yogic claim of voluntary control over the heart beat: an unusual demonstration. Am Heart J. 1973 Aug;86(2):282-4.

Wallace RK, Silver J, Mills PJ, Dillbeck MC, Wagoner DE. Systolic blood pressure and long-term practice of the Transcendental Meditation and TM-Sidhi program: effects of TM on systolic blood pressure. Psychosom Med. 1983 Mar;45(1):41-6.

Lazar SW, Kerr CE, Wasserman RH, Gray JR, Greve DN, Treadway MT, et al. Meditation experience is associated with increased cortical thickness. Neuroreport. 2005 Nov;16(17):1893-7.

Chaya MS, Kurpad AV, Nagendra HR, Nagarathna R. The effect of long term combined yoga practice on the basal metabolic rate of healthy adults. BMC Complement Altern Med. 2006 Jan;6:28.




How to Cite

HC, S., Shetty, P., R, C. K., & Shetty, S. (2017). Effect of yoga on autonomic functions in medical students: a pilot study. International Journal of Research in Medical Sciences, 3(5), 1046–1051. Retrieved from https://www.msjonline.org/index.php/ijrms/article/view/1440



Original Research Articles