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BACKGROUND Pranayama is a Yogic technique in which breathing is controlled voluntarily. Aim-To study the effect of yoga exercise ("Pranayama" breathing exercise) and meditation on cardiorespiratory parameters in young healthy volunteers.

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Stress is described as a state of anxiety, strain, nervousness, tension, constant worry or pressure, to produce hypertension and other cardiovascular disorders and can greatly enhanced secretion of cortisol due to increased activity in the limbic system, especially in the region of the amygdala and hippocampus,The aims of this study was to investigate whether regular practice of yoga for sixty minutes twice a day for six months can improve the cardiovascular status and decrease serum cortisol in hyper-reactors to cold pressor test in young healthy medical students. SummaryThe regular practice of yoga for six months acts as stress buster, to reduce the hyerrectivity to cold pressor test by inducing parasympathetic predominance and cortico- hypothalamo-medullary inhibition.