Measurement of the effect of Isha Yoga on cardiac autonomic nervous system using short-term heart rate variability

Krishnan Muralikrishnan, Bhavani Balakrishnan, Kabali Balasubramanian, Fehmida Visnegarawla, Krishnan Muralikrishnan, Bhavani Balakrishnan, Kabali Balasubramanian, Fehmida Visnegarawla

Abstract

Background: Beneficial effects of Yoga have been postulated to be due to modulation of the autonomic nervous system.

Objective: To assess the effect of Isha Yoga practices on cardiovascular autonomic nervous system through short-term heart rate variability (HRV).

Design of the study: Short-term HRV of long-term regular healthy 14 (12 males and 2 females) Isha Yoga practitioners was compared with that of age- and gender-matched 14 (12 males and 2 females) non-Yoga practitioners.

Methods and materials: ECG Lead II and respiratory movements were recorded in both groups using Polyrite during supine rest for 5 min and controlled deep breathing for 1 minute. Frequency domain analysis [RR interval is the mean of distance between subsequent R wave peaks in ECG], low frequency (LF) power, high frequency (HF) power, LF normalized units (nu), HF nu, LF/HF ratio] and time domain analysis [Standard Deviation of normal to normal interval (SDNN), square of mean squared difference of successive normal to normal intervals (RMSSD), normal to normal intervals which are differing by 50 ms (NN50), and percentage of NN50 (pNN50)] of HRV variables were analyzed for supine rest. Time domain analysis was recorded for deep breathing.

Results: Results showed statistically significant differences between Isha Yoga practitioners and controls in both frequency and time domain analyses of HRV indices, with no difference in resting heart rate between the groups.

Conclusions: Practitioners of Isha Yoga showed well-balanced beneficial activity of vagal efferents, an overall increased HRV, and sympathovagal balance, compared to non-Yoga practitioners during supine rest and deep breathing.

Keywords: Cardiovascular ANS; Isha Yoga; heart rate variability.

Conflict of interest statement

Conflict of Interest: None declared.

Figures

Figure 1
Figure 1
HRV Analysis During Supine Rest. RR interval: distance between subsequent R wave peaks in ECG,LF: Low Frequency, HF: High Frequency, nu: normalized units, SDNN: Standard Deviation of Normal to Normal RR interval
Figure 2
Figure 2
HRV Analysis During 1 minute Deep Breathing. RMSSD: square of mean squared difference of successive normal to normal intervals, NN50: normal to normal intervals which are differing by 50 ms, pNN50: percentage of NN50

References

    1. Ganong WF. Cardiovascular regulatory mechanisms. In: Ganong WF, editor. Review of Medical Physiology. 21st ed. USA: Lange Medical publications; 2003. pp. 555–67.
    1. Makikallio TH, Huikuri HV, Mäkikallio A, Sourander LB, Mitrani RD, Castellanos A, et al. Prediction of sudden cardiac death by fractal analysis of heart rate variability in elderly subjects. J Am Coll Cardiol. 2001;37:1395–402.
    1. Jouven X, Empana J-P, Schwartz P, Desnos M, Courbon D, Ducimetière Heart-Rate profile during exercise as a predictor of sudden death. N Engl J Med. 2005;352:1951–8.
    1. Harriet P, Dustan MD. NIH Publication; 1997. Location–University of Vermont College of Medicine, Burlington VT, The Sixth Report of the Joint National Commitee on Prevention, edition and Evaluation and treatment of High Blood Pressure; pp. 98–4080.
    1. Evans S, Mose J C, Sao CJ T. Using the biopsychosocial model to understand the health benefits of Yoga. JCIM. 2009;6:1. Pages – ISSN (Online) 1553-3840.
    1. Khattab K, Khattab AA, Ortak J, Richardt G, Bonnemeier H. Iyengar yoga increases cardiac parasympathetic nervous modulation among healthy yoga practitioners. Evid Based Complement Alternat Med. 2007;4:511–17.
    1. Telles S, Joshi M, Dash M, Raghuraj P, Naveen KV, Nagendra HR. An evaluation of the ability to voluntarily reduce the heart rate after a month of yoga practice. IPBS. 2004:119–125.
    1. Selvaraj N, Shivplara NB, Bhatia M, Santhosh J, Deepak KK, Anand S. Heart Rate Dynamics during Shambhavi Mahamudra- A Practice of Isha Yoga. JCIM. 2008;5 Article 22: Pages – ISSN (Online) 1553-3840.
    1. Heart rate variability: Standards of measurement, physiological interpretation and clinical use. Task Force of the European Society of Cardiology and the North American Society of Pacing and Electrophysiology. Circulation. 1996;93:1043–65.
    1. Kleiger RE, Miller JP, Bigger JT, Jr, Moss AJ. Decreased heart rate variability and its association with increased mortality after acute myocardial infarction. Am J Cardiol. 1987;59:256–62.
    1. Paul Grossman Edwin W. Taylor Toward understanding respiratory sinus arrhythmia: Relations to cardiac vagal tone, evolution and biobehavioral. Biol Psychol. 2007;74:263–85.
    1. Thrasher TN. Baroreceptors and long term control of Blood Pressure. EXP Physiol. 2004;89:331–41.
    1. Tank J, Schroeder C, Diedrich A, Szczech E, Haertter S, Sharma AM, et al. Selective impairment in sympathetic vasomotor control with norepinephrine transporter inhibition. Circulation. 2003;107:2949–54.
    1. DiBona GF. The Sympathetic Nervous System and Hypertension: Recent Developments. Hypertension. 2004;43:147–50.
    1. Malliani A, Pagani M, Lombardi F, Cerutti S. “Cardiovascular neural regulation explored in the frequency domain”. Circulation. 1991;84:482–92.
    1. Malliani A, Pagani M, Furlan R, Guzzetti S, Lucini D, Montano N, et al. Individual recognition by heart rate variability of two different autonomic profiles related to posture. Circulation. 1997;96:4143–5.
    1. Chiou C, Zipes D. Selective vagal denervation of the atria eliminates heart rate variability and baroreflex sensitivity while preserving ventricular innervation. Circulation. 1998;98:360–8.
    1. Eckberg D. Sympathovagal balance: A critical appraisal. Circulation. 1997;96:3224–32.
    1. Bernardi L, Spadacini G, Bellwon J, Hajric R, Roskamm H, Frey AW. Effect of breathing rate on oxygen saturation and exercise performance in chronic heart failure. Lancet. 1998;351:1308–11.
    1. Spicuzza L, Gabutti A, Porta C, Montano N, Bernardi L. Yoga and chemoreflex response to hypoxia and hypercapnia. Lancet. 2000;356:1495–6.
    1. Taylor JA, Eckberg DL. Fundamental relations between short-term RR interval and arterial pressure oscillations in humans. Circulation. 1996;93:1527–32.
    1. Sundararajan M. Optical Sensor Based Instrument for Correlative Analysis of Human ECG and Breathing Signal. 2009;1:287–98.

Source: PubMed

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