28 June 2016 : Original article
A Functional Near-Infrared Spectroscopy Study of High-Frequency Yoga Breathing Compared to Breath AwarenessShirley TellesACDE, Ram Kumar GuptaBCDEF, Nilkamal SinghDEF, Acharya BalkrishnaAG
Med Sci Monit Basic Res 2016; 22:58-66
BACKGROUND: High-frequency yoga breathing (breath rate of 2.0 Hz) has been associated with changes in oxy-hemoglobin in the prefrontal region of the brain. The present study assessed the effects of high-frequency yoga breathing (HFYB) at 1.0 Hz on frontal oxy-hemoglobin (oxy-Hb) and deoxy-hemoglobin (deoxy-Hb).
MATERIAL AND METHODS: Forty healthy male participants were recruited for the study. The experimental group consisted of 20 participants 23–40 years old (group mean ±S.D., 26.4±4.7 years) with at least 3 months of experience performing HFYB (group mean ±S.D., 16.3±9.8 months). The control group consisted of 20 participants ages 23–38 years (group mean age ± S.D., 27.4±4.1 years), who were seated quietly for the same duration and their average experience of yoga practice was (±S.D.) 4.3±2.7 months. Each participant in the experimental group was assessed at 2 sessions (HFYB and breath awareness [BAW]) on alternate days. Hemodynamic changes were assessed using a functional near-infrared spectroscopy sensor placed over the forehead. Data were analyzed using repeated-measures analyses of variance followed by post hoc Bonferroni adjustment.
RESULTS: A significant reduction was observed in oxy-Hb during and after HFYB on the left and right sides compared to values before. We also found a significant reduction in deoxy-Hb during and after the quiet sitting control session compared to pre-session values on left and right sides.
CONCLUSIONS: The decrease in oxy-Hb during and after HFYB suggests that there was no frontal activation during HFYB when practiced at the rate of 1.0 Hz.
Keywords: Cerebral Arteries, Hemodynamics, Yoga, fNIRs, Meditation
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