F. SVYASA Dissertations

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IMMEDIATE EFFECTS OF 90 DEGREE VERSUS 45 DEGREE INVERSION ON CEREBRAL HEMODYNAMICS AND HRV IN YOGA PRACTITIONERS: A RANDOMIZED CONTROLLED STUDY
(S-VYASA, 2026) TARUN KUMAR S.; JANANI A P; AMSHUMAN R YADAV; Krishna Dwivedi
Background: Inverted yoga postures are believed to influence cerebral circulation and autonomic nervous system regulation by altering gravitational blood flow dynamics. Practices such as 90° inversion and 45° inversion are traditionally used in yoga for promoting physiological balance and relaxation. However, scientific evidence comparing the immediate cerebrovascular and autonomic effects of different inversion angles remains limited. Aim: To investigate the immediate effects of two inversion postures—90° inversion and 45° inversion on cerebrovascular hemodynamics and cardiac autonomic function in healthy yoga practitioners. Methods: This randomized controlled study included 40 healthy yoga practitioners aged 18–35 years who had at least six months of yoga practice. Participants were randomly assigned to either the 90° inversion group or 45° inversion group. Each participant maintained the posture for approximately turn on I thought yesterday he only gave Roshan only completely3 minutes under supervision. Physiological assessments were conducted at three time points: baseline (supine rest), during the posture, and post-intervention recovery. Assessment: Cerebrovascular hemodynamic parameters—Peak Systolic Velocity (PSV), End-Diastolic Velocity (EDV), Mean Flow Velocity (MFV), Pulsatility Index (PI), and Resistance Index (RI)—were measured in the left Middle Cerebral Artery using Transcranial Doppler ultrasonography. Cardiac autonomic activity was assessed through heart rate variability (HRV) analysis, including time-domain and frequency-domain parameters. Results: Both inversion postures produced significant changes in cerebrovascular and autonomic parameters across the pre, during, and post phases. Mean flow velocity and end-diastolic velocity increased significantly during inversion, while pulsatility index and resistance index decreased, indicating improved vascular compliance. 90° inversion produced stronger autonomic and hemodynamic responses during the posture, whereas 45° inversion showed a more gradual recovery pattern with sustained reductions in vascular resistance. Conclusion: Both 90° inversion and 45° inversion significantly influence cerebral circulation and autonomic nervous system activity, though with different physiological patterns. 90° inversion induces stronger acute regulatory responses, while 45° inversion promotes a more sustained reduction in cerebrovascular resistance during recovery. These findings suggest that different inversion angles may offer distinct therapeutic applications for improving cerebrovascular regulation and autonomic balance. Keywords: Yoga, Inversion Postures, 90° inversion, 45° inversion, Cerebral Blood Flow, Transcranial Doppler, Heart Rate Variability, Autonomic Nervous System.
THE EFFECT OF GAYATRI MANTRA CHANTING ON HEART RATE VARIABILITY (HRV) IN HEALTHY INDIVIDUALS
(S-VYASA, 2026) KAVYA R; RANJITHA R
BACKGROUND Mantra chanting is an integral component of Yogic science and has been practiced since ancient times for mental and physiological well-being. Recent studies have demonstrated that mantra chanting positively influences autonomic regulation, cognitive function and psychological health. The Gayatri Mantra, particularly the Savitri Gayatri, is one of the most widely practiced mantras in Mantra Yoga and is traditionally believed to enhance mental clarity and balance. Scientific studies suggest that Gayatri Mantra chanting promotes alpha brain wave activity and improves heart rate variability (HRV), indicating better autonomic balance and stress regulation. AIM  This study aims to evaluate the effect of Gayatri Mantra chanting on heart rate variability in healthy individuals. OBJECTIVE  The objective of this study is to determine the short-term effect of Gayatri Mantra chanting on heart rate variability in healthy individuals. MATERIALS AND METHODS Participants: A total of 34 college-going students of the age group 18-25 years were recruited based on convenience sampling. The participants were allocated into experimental and control groups, each consisting of 17 participants. Design: Participants who expressed interest in the study were first screened using the predefined inclusion and exclusion criteria. Thirty-four eligible participants were selected, after which written informed consent was obtained, and they were subsequently allocated to the experimental and control groups. Assessments:  Mean RR Interval  Standard Deviation of NN Intervals (SDNN)  Root Mean Square of Successive Differences (RMSSD)  Low Frequency Power (LF)  High Frequency Power (HF)  LF/HF Ratio  Poincaré SD1  Poincaré SD2 Intervention:  Participants in the experimental group were instructed to perform 18 rounds of Gayatri Mantra chanting in accordance with the Yajurveda tradition daily for a period of 14 consecutive days.  The control group did not receive any intervention during the study period. Results: A statistically significant improvement was observed in several HRV parameters in the experimental group following Gayatri Mantra chanting, whereas no significant changes were noted in the control group. This indicates that Gayatri Mantra chanting significantly influences heart rate variability in healthy individuals, although some parameters did not reach statistical significance. Conclusion: Gayatri Mantra chanting has a significant effect on heart rate variability in healthy individuals, indicating a measurable influence on autonomic variability. Key Words: Gayatri Mantra chanting, Heart Rate Variability, Yajurveda tradition

F. SVYASA Dissertations

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