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Exercise-induced oxyhemoglobin desaturation and pulmonary diffusing capacity during high-intensity exercise

R Turcotte1, L Kiteala, J E Marcotte

  • 1Dept. of Physical Education, McGill University, Montreal, Canada.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1997
PubMed
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Exercise-induced oxyhemoglobin desaturation in athletes is not linked to pulmonary diffusing capacity. Ventilation may limit oxygen saturation during maximal exercise in these individuals.

Area of Science:

  • Sports Medicine
  • Exercise Physiology
  • Pulmonary Function

Background:

  • Highly trained endurance athletes sometimes exhibit exercise-induced arterial oxyhemoglobin desaturation.
  • The underlying physiological mechanisms for this phenomenon require further investigation.
  • Pulmonary diffusing capacity (DL) is a potential factor influencing exercise oxygen saturation.

Purpose of the Study:

  • To investigate the relationship between exercise-induced oxyhemoglobin desaturation and pulmonary diffusing capacity (DL) in male endurance athletes.
  • To determine if differences in DL during exercise distinguish athletes who desaturate from those who do not.
  • To explore the role of ventilation in exercise oxygen saturation.

Main Methods:

  • Pulmonary diffusing capacity for carbon monoxide (DLCO) was measured at rest and during cycling exercise (60% and 90% VO2max) in 24 male endurance athletes.

Related Experiment Videos

  • Arterial oxyhemoglobin saturation (SaO2%) was monitored using pulse oximetry during exercise.
  • Subjects were categorized into desaturation (DS) and non-desaturation (NDS) groups based on SaO2% at VO2max.

    • Main Results:

    • No significant differences in resting DLCO, DLCO/VA, maximal voluntary ventilation (MVV), or FEV1/FVC were found between DS and NDS groups.
    • Exercise DLCO remained similar between DS and NDS groups at both 60% and 90% VO2max.
    • A significant inverse relationship was observed between SaO2% and ventilation efficiency (VE/VO2) during maximal exercise, suggesting ventilation may limit oxygen saturation in the DS group.

    Conclusions:

    • Exercise-induced oxyhemoglobin desaturation in endurance athletes is not primarily related to differences in pulmonary diffusing capacity (DL).
    • Lower ventilation efficiency (VE/VO2) during maximal exercise may be a limiting factor for arterial oxygen saturation in athletes who desaturate.
    • Further research is warranted to elucidate the complex interplay of factors contributing to exercise-induced desaturation in elite athletes.