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 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 .