Effects of respiratory self-control on cardiovascular and psychological reactivity to laboratory stressors

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To determine whether self-control of breathing can alter cardiovascular and psychological reactivity to a laboratory stressor, 29 male and female subjects were assigned at random to either experimental (n=13) or control (n=16) groups. All of the subjects completed two sessions of three trials each following a laboratory stress protocol involving mental arithmetic and cold pressor tests. The experimental subjects did not regulate their breathing during the first trial of each session, and tried to regulate their minute ventilation (MV) at their resting level during the following two trials using breath-by-breath MV feedback. The experimental subjects were able to prevent increases in their MV in response to the stressor, and had a significantly slower respiration rate, larger tidal volume, and higher end-tidal PCO2 than the control subjects. The experimental subjects also had smaller increases in their heart rate than the control subjects (p <0.08). There was no statistical difference in either blood pressure or psychological mood between the two groups. These results suggest that self-control of breathing can be effective in altering cardiac parasympathetic inhibition during stress. ( Japanese Journal of Physiological Psychology and Psychophysiology, 23 (3) : 207-215, 2005.)
Japanese Society for Physiological Psychology and Psychophysiologyの論文