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

Perini, Renza
Tironi, Adelaide
Gheza, Alberto
Butti, Ferdinando
Published in European Journal of Applied Physiology. 2008, vol. 104, no. 1, p. 1-7
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, PhysiologicalAdultApnea/metabolism/physiopathologyAutonomic Nervous System/physiopathologyBaroreflexBlood PressureBradycardia/physiopathologyDivingFemaleHeart RateHumansHypertension/physiopathologyMaleMiddle AgedOxygen/bloodRespiratory MechanicsTime Factors
PMID: 18496707
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Research group Métabolisme énergétique (642)
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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 https://archive-ouverte.unige.ch/unige:1979

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Deposited on : 2009-06-11

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