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Hypertension and Yoga
-- Blackwell, B., Bloomfield, S., Gartside, P., Robinson, A., Hanenson, I., Magenheim, Nidich, S., and Zigler, R. (1976). Transcendental meditation in hypertension. Individual response patterns. Lancet 1, 223-226.
A study was conducted in seven previously untrained male adults who underwent a combination of yogic exercises, daily for one hour, over a period of four months. These findings suggest that yoga induces a state of blood hypocoagulability suggesting positive effects of yoga on prevention of cardiovascular and thrombotic disorders.
-- Chohan, I. S., Nayar, H. S., Thomas, P., and Geetha, N. S. (1984). Influence of yoga on blood coagulation. Thrombosis & Haemostasis 51, 196-197.
Studied physiological variables in 40 men (aged 16-46 yrs) before and after yoga-based isometric relaxation technique and supine rest. Assessments of autonomic parameters included oxygen consumption, breath rate, and breath volume. There was a significant decrease in breath rate after yoga and in finger plethysmogram after supine rest.
-- Vempati,-R-P; Telles,-Shirley (1999). Yoga based isometric relaxation versus supine rest: A study of oxygen consumption, breath rate and volume and autonomic measures. Journal-of-Indian-Psychology 17, 46-52.
Two yoga practices, one combining "calming and stimulating" measures and the other, a "calming" technique, were compared. There was a significant decrease in the amount of oxygen consumed and in breath rate and an increase in breath volume after both types of sessions. However, the magnitude of change on all 3 measures was greater after the calming and stimulating session: Oxygen consumption decreased 32% compared with 10%; breath rate decreased 18% versus 15%; and breath volume increased 29% versus 16%. These results support the idea that a combination of yoga postures interspersed with relaxation reduces arousal more than relaxation alone does.
-- Telles S. Reddy SK. Nagendra HR. (2000). Oxygen consumption and respiration following two yoga relaxation techniques. Applied Psychophysiology & Biofeedback 25, 221-7.
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