F. SVYASA Dissertations
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Yoga Dissertations by Yoga Students at SVYASA. These pages present some efforts of SVYASA at Scientific Validation of Yoga, combining the best of the East with the best of the West
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Item 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 DwivediBackground: 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.Item THE EFFECT OF GAYATRI MANTRA CHANTING ON HEART RATE VARIABILITY (HRV) IN HEALTHY INDIVIDUALS(S-VYASA, 2026) KAVYA R; RANJITHA RBACKGROUND 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 traditionItem Changes in heart rate variability following one month yoga practice(S-Vyasa, 2017-01-16) YogananduBackground: Yoga is a science that facilitates homeostasis, an ancient way of life intended to improve the quality of life of an individual. Practice of yoga is proposed to alter the autonomic nervous system and affect the cardiovascular functioning. Aim & Objectives: To asses the changes in heart rate variability following one month yoga practice. Materials and Methods: Thirty nine healthy male volunteers with ages ranging from 18–53 years were included for the study. They were are students of one month yoga instructor course at SVYASA Bangaloure. Heart rate variability was assessed before and after one month Yoga practice. Results: Data were checked for normality using Shapiro–Wilk test. Post values were compared with pre values using paired samples t-test and Wilcoxon signed rank test for normally distributed and not normally distributed data respectively. Shapiro–Wilk test indicated that SDNN (P = 0.0359), NN50 (P = 0.226), RMSSD (P = 0.452), LF (P=0.109), HF (P=0.0835) was normally distributed. There was a significant increase in SDNN after one month yoga practice compared to pre values (Paired samples t test, P <0.05). However, there was no significant change in Heart rate, RMSSD, NN50, LF, HF & LF / HF ratio. Conclusion: Autonomic balance tilts toward parasympathetic predominance after 1 month practice of yoga.Item Changes in Heart Rate Variability Following Yogic Visual Concentration (Traoaka)(S-VYASA, 2014-06-13) V. RammurthyYoga is an ancient Indian science and way of life. Sage Patanjali (circa 900 B.C) explains the theoretical aspects yoga in 196 aphorisms called yoga sutras (Taimini, 1999). Patanjali evolved Aṣṭaanga yoga (eight limbed yoga) to reach the ultimate reality. Later around 10th Century CE Sage Svatmarama wrote a text called Haoha Yoga Pradipika which explains the method and benefit of yoga techniques. He prescribes six cleansing techniques (kriyas) viz., dauti, basti, neti, trataka, nauli and kapalabhati to purify the body. The goal of Haoha Yoga is to prepare the body and mind for the practice of Rajayoga or Aṣṭanga Yoga (Muktibodhananda, 1993). The literal meaning of the Sanskrit word traṭaka is “to gaze steadily”. Looking intently with an unwavering gaze at a small point until tears are shed is known as traṭaka (Haoha Yoga Pradipika, Ch:2.31). Haoha Yoga Pradipika mentions that, practice of traṭaka eradicates all the eye diseases, fatigue and lethargy (Haoha Yoga Pradipika, Ch: 2.32). Though traṭaka is considered as cleansing technique, the final stage of traṭaka leads to meditative mental state (Nagaratha & Nagendra, 2000). Recently, a study has been conducted to assess the immediate effect of traṭaka on critical flicker fusion (Mallick & Kulkarni, 2010). The critical flicker fusion (CFF) is defined as the frequency at which a flickering stimulus is perceived to be continuous. There was a significant increase in CFF following traṭaka suggesting changes at the cortical level in the processes that mediate fusion. Meditation and autonomic changes are researched extensively and shown shift towards vagal tone during meditation (Orme-Johnson, 1973; Telles et al., 2013; Wallace, 1970). However, there was no study evaluating autonomic changes during traṭaka which is similar to meditation. Hence, in the present study, we used heart rate variability (HRV) which is a well-known and extensively used method to evaluate autonomic modulation .