Assessment of Autonomic Function in Subjects Practicing Yoga Using Spectral Analysis and Approximate Entropy Method
Journal Title: Journal of Case Reports and Studies - Year 2017, Vol 5, Issue 3
Abstract
Objective: Autonomic nervous system involvement in subjects practicing Yoga has rarely been studied and has shown conflicting results. Our main purpose was to assess the effect of Yoga on autonomic function of group of subjects practicing Yoga regularly in comparison with another group with normal control subjects by measuring the frequency gain response of the two groups. Other aim of this study was to determine wither the duration of Yoga practicing correlated with measures of heart rate variability signal (HRV) using approximate entropy index (ApEn). Methods: Fifty two subjects practicing Yoga and fifty one matched healthy subjects were evaluated at Yoga Center, Nashville, Tennessee, USA during 2014/ 2015 by measuring the breathing at different rates and HRV signal derived from Electrocardiogram (ECG). The auto-power and cross power spectra between HRV signal and breathing signal at different breathing rate were calculated and frequency gain response for both groups was obtained. ApEn described as measure of regularity of HRV was calculated for subjects practicing Yoga and healthy control subjects. Results: Both frequency gain response and ApEn measure were reduced in normal subjects group in comparison with Yoga subjects group. The power spectra of Yoga practicing subjects showed increase in amplitude of high frequency (HF) value as well as higher amplitude of low frequency with respect to control subjects. On other hand, ApEn measure was significantly increased in Yoga subjects as they are practicing Yoga for long duration. Conclusion: These findings suggest that the spectral analysis of HRV signal using breathing at different frequencies may detect balance of autonomic of autonomic system of Yoga subjects with specially with increasing the sympathetic activity (higher low frequency) and increasing also the parasympathetic tone (Higher frequency gain response) which can lead to balanced activity of Yoga subjects comparing to normal healthy subjects. APEn may be marker related to the yoga practicing duration for Yoga subjects.
Authors and Affiliations
Kamal Ahmed
Keywords
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- EP ID EP584533
- DOI 10.15744/2348-9820.5.304
- Views 333
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