en
Scientific article
English

Heart rate and blood pressure time courses during prolonged dry apnoea in breath-hold divers

Published inEuropean journal of applied physiology, vol. 104, no. 1, p. 1-7
Publication date2008
Abstract

To define the dynamics of cardiovascular adjustments to apnoea, beat-to-beat heart rate (HR) and blood pressure and arterial oxygen saturation (SaO(2)) were recorded during prolonged breath-holding in air in 20 divers. Apnoea had a mean duration of 210 +/- 70 s. In all subjects, HR attained a value 14 beats min(-1) lower than control within the initial 30 s (phase I). HR did not change for the following 2-2.5 min (phase II). Then, nine subjects interrupted the apnoea (group A), whereas 11 subjects (group B) could prolong the breath-holding for about 100 s, during which HR continuously decreased (phase III). In both groups, mean blood pressure was 8 mmHg above control at the end of phase I; it then further increased by additional 12 mmHg at the end of the apnoea. In both groups, SaO(2) did not change in the initial 100-140 s of apnoea; then, it decreased to 95% at the end of phase II. In group B, SaO(2) further diminished to 84% at the end of phase III. A typical pattern of cardiovascular readjustments was identified during dry apnoea. This pattern was not compatible with a role for baroreflexes in phase I and phase II. Further readjustment in group B may imply a role for both baroreflexes and chemoreflexes. Hypothesis has been made that the end of phase II corresponds to physiological breakpoint.

Keywords
  • Adaptation, Physiological
  • Adult
  • Apnea/metabolism/physiopathology
  • Autonomic Nervous System/physiopathology
  • Baroreflex
  • Blood Pressure
  • Bradycardia/physiopathology
  • Diving
  • Female
  • Heart Rate
  • Humans
  • Hypertension/physiopathology
  • Male
  • Middle Aged
  • Oxygen/blood
  • Respiratory Mechanics
  • Time Factors
Citation (ISO format)
PERINI, Renza et al. Heart rate and blood pressure time courses during prolonged dry apnoea in breath-hold divers. In: European journal of applied physiology, 2008, vol. 104, n° 1, p. 1–7. doi: 10.1007/s00421-008-0771-1
Main files (1)
Article (Accepted version)
accessLevelRestricted
Identifiers
ISSN of the journal1439-6319
546views
0downloads

Technical informations

Creation06/11/2009 10:24:00 AM
First validation06/11/2009 10:24:00 AM
Update time03/14/2023 3:06:36 PM
Status update03/14/2023 3:06:36 PM
Last indexation01/15/2024 6:33:31 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack