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Computer simulation of human breath-hold diving: cardiovascular adjustments.

John R Fitz-Clarke1

  • 1Department of Physiology and Biophysics, Dalhousie University, 5849 University Avenue, Halifax, NS, Canada, B3H 4H7. jfitzclarke@eastlink.ca

European Journal of Applied Physiology
|February 27, 2007
PubMed
Summary

Deep breath-hold diving causes significant blood shift to the chest, potentially damaging lung capillaries. Computer models show extreme pressures at record depths, highlighting a physiological limit for human breath-hold divers.

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Area of Science:

  • Physiology
  • Cardiovascular Science
  • Diving Medicine

Background:

  • Human breath-hold diving records exceed 200m with sled assistance.
  • Lung compression during descent shifts blood centrally, potentially causing pulmonary capillary stress failure.
  • Understanding cardiopulmonary responses is crucial for deep diving safety.

Purpose of the Study:

  • To investigate cardiopulmonary interactions during deep breath-hold diving.
  • To elucidate hemodynamic responses and estimate vascular stresses.
  • To identify physiological limitations in extreme diving depths.

Main Methods:

  • Development of a computer model simulating cardiopulmonary interactions.
  • Modeling active and passive cardiovascular adjustments.

Related Experiment Videos

  • Simulating apnea and compression at depths up to 200m.

    • Main Results:

    • Blood volume redistribution from peripheral to central compartments increases with depth.
    • Pulmonary capillary transmural pressures exceed 50 mm Hg at record depths.
    • Chest wall recoil significantly contributes to alveolar air pressure drop and capillary stress.

    Conclusions:

    • Deep diving induces pulmonary capillary stresses potentially causing alveolar damage.
    • Blood redistribution partially mitigates capillary pressure.
    • Autonomic diving reflexes have minimal impact on pulmonary vascular pressures at extreme depths.