Abstract
Day time activities are known to influence the sleep on the following night. Cyclic meditation (CM) has recurring cycles. Previously, the low frequency (LF) power and the ratio between low frequency and high frequency (LF/HF ratio) of the heart rate variability (HRV) decreased during and after CM but not after a comparable period of supine rest (SR). In the present study, on thirty male volunteers, CM was practiced twice in the day and after this the HRV was recorded (1) while awake and (2) during 6 h of sleep (based on EEG, EMG and EGG recordings). This was similarly recorded for the night’s sleep following the day time practice of SR. Participants were randomly assigned to the two sessions and all of them practiced both CM and SR on different days. During the night following day time CM practice there were the following changes; a decrease in heart rate, LF power (n.u.), LF/HF ratio, and an increase in the number of pairs of Normal to Normal RR intervals differing by more than 50 ms divided by total number of all NN intervals (pNN50) (P < 0.05, in all cases, comparing sleep following CM compared with sleep following SR). No change was seen on the night following SR. Hence yoga practice during the day appears to shift sympatho-vagal balance in favor of parasympathetic dominance during sleep on the following night.
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Acknowledgments
The Authors gratefully acknowledge H.R. Nagendra, Ph.D. who derived the cyclic meditation technique from ancient yoga texts. The funding from the Indian Council of Medical Research, Government of India, as part of a grant (Project No. 2001-05010) towards the Center for Advanced Research in Yoga and Neurophysiology is also gratefully acknowledged.
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Patra, S., Telles, S. Heart Rate Variability During Sleep Following the Practice of Cyclic Meditation and Supine Rest. Appl Psychophysiol Biofeedback 35, 135–140 (2010). https://doi.org/10.1007/s10484-009-9114-1
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DOI: https://doi.org/10.1007/s10484-009-9114-1