Abstract
Objective: To investigate whether breathing more slowly modifies the sensitivity of the chemoreflex and baroreflex. Design Setting: University of Pavia, IRCCS Policlinico S. Matteo. Participants: Fifteen healthy individuals. Interventions: Progressive isocapnic hypoxia and progressive hyperoxic hypercapnia were measured during spontaneous breathing and during a breathing rate fixed at 6 and 15 breaths per minute (b.p.m.). Main outcome measures: Variations in chemo- and baroreflex sensitivity (by monitoring ventilation, oxygen saturation, end-tidal carbon dioxide, R - R interval and blood pressure) induced by different breathing rates. Results: Breathing at 6 b.p.m, depressed (P <0.01) both hypoxic and hypercapnic chemoreflex responses, compared with spontaneous or 15 b.p.m. controlled breathing. Hypoxic and hypercapnic responses during spontaneous breathing correlated with baseline spontaneous breathing rate (r = -0.52 and r = +0.51, respectively; P = 0.05). Baroreflex sensitivity was greater (P <0.05) during slow breathing at baseline and remained greater at end rebreathing. Conclusions: Slow breathing reduces the chemoreflex response to both hypoxia and hypercapnia. Enhanced baroreflex sensitivity might be one factor inhibiting the chemoreflex during slow breathing. A slowing breathing rate may be of benefit in conditions such as chronic heart failure that are associated with inappropriate chemoreflex activation.
Original language | English |
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Pages (from-to) | 2221-2229 |
Number of pages | 9 |
Journal | Journal of Hypertension |
Volume | 19 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2001 |
Keywords
- Baroreflex
- Breathing rate
- Chemoreflex
- Hypercapnia
- Hypoxia
ASJC Scopus subject areas
- Internal Medicine
- Endocrinology