A comprehensive overview of scientific literature on yogic breathing (pranayama) finds that these techniques produce beneficial effects on neurocognitive, psychophysiological, respiratory, biochemical, and metabolic functions in healthy individuals and are useful in managing various clinical conditions. The review, which included experimental papers, case studies, and case series from 1400 references, concludes that yogic breathing is safe when practiced under the guidance of a trained teacher. The authors call for further large-scale studies with rigorous designs to understand the underlying mechanisms.
Sailors who practiced 45 minutes of Cyclic Meditation daily for three weeks experienced reduced anxiety and improved sleep quality, along with lower blood pressure and pulse rate, compared to a control group that continued routine activities. The control group showed no significant changes. The findings suggest that Cyclic Meditation can be a practical routine for sailors to manage anxiety and enhance sleep during long voyages.