http://repository.lib.vpa.ac.lk/handle/123456789/166 2026-04-21T12:44:43Z http://repository.lib.vpa.ac.lk/handle/123456789/221 Enhancing cardiac parasympathetic nervous activity using a posture respiration ambient biofeedback system : a pilot study Herath, Samitha S.; Kusumi, Akira; Note, Yosuke; Nakamura, Etsuhisa; Nozawa, Akio; Nomura, Shusaku A respiration–posture feedback system was developed to control breathing involuntarily. A small air chamber placed under a subject’s back deflates and inflates to make a subject’s upper body move vertically while lying on a bed. By regulating the deflation/inflation of the air chamber in synchronization with actual respiration, the subject’s respiration was successfully lengthened and deepened. The modulation of the respiration acted as a physiological sedative for the subject as the heart rate variability index suggested that the subject’s parasympathetic nervous system activity was enhanced. 2017-11-01T00:00:00Z http://repository.lib.vpa.ac.lk/handle/123456789/220 Efficacy of Involuntary Deep Breathing by Postural-Respiration Feedback Control System Herath, Samitha S.; Hayakawa, Kazuki; Sakai, Osamu; Sekiya, Ryoma; Nomura, Shusaku Attached 2018-01-01T00:00:00Z