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Override of spontaneous respiratory pattern generator reduces cardiovascular parasympathetic influenceWe investigated the effects of voluntary control of breathing on autonomic function in cardiovascular regulation. Variability in heart rate was compared between 5 min of spontaneous and controlled breathing. During controlled breathing, for 5 min, subjects voluntarily reproduced their own spontaneous breathing pattern (both rate and volume on a breath-by-breath basis). With the use of this experimental design, we could unmask the effects of voluntary override of the spontaneous respiratory pattern generator on autonomic function in cardiovascular regulation without the confounding effects of altered respiratory pattern. Results from 10 subjects showed that during voluntary control of breathing, mean values of heart rate and blood pressure increased, whereas fractal and spectral powers in heart rate in the respiratory frequency region decreased. End-tidal PCO2 was similar during spontaneous and controlled breathing. These results indicate that the act of voluntary control of breathing decreases the influence of the vagal component, which is the principal parasympathetic influence in cardiovascular regulation.
Document ID
20050000145
Document Type
Reprint (Version printed in journal)
Authors
Patwardhan, A. R. (University of Kentucky Lexington 40506-0070, United States)
Vallurupalli, S.
Evans, J. M.
Bruce, E. N.
Knapp, C. F.
Date Acquired
August 22, 2013
Publication Date
September 1, 1995
Publication Information
Publication: Journal of applied physiology (Bethesda, Md. : 1985)
Volume: 79
Issue: 3
ISSN: 8750-7587
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Cardiopulmonary
Non-NASA Center