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Hypoxic blackout in dynamic apnea: A case report.

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|January 30, 2026
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Blackout in breath-hold diving can occur at 50% arterial oxygen saturation (SpO₂), even without arrhythmias. Early desaturation patterns in submaximal dives may indicate individual risk for blackout.

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Area of Science:

  • Physiology
  • Sports Science
  • Diving Medicine

Background:

  • Blackout (BO) in breath-hold diving is linked to cerebral hypoxia.
  • Direct observation of BO events and associated physiological changes is limited.
  • Understanding the physiological triggers of BO is crucial for diver safety.

Purpose of the Study:

  • To investigate arterial oxygen saturation (SpO₂) and heart rate (HR) during dynamic apnea.
  • To document physiological responses leading to blackout in trained freedivers.
  • To identify potential predictors of blackout in breath-hold diving.

Main Methods:

  • Continuous SpO₂ and HR monitoring using a waterproof oximeter in 11 trained freedivers.
  • Performance of two dynamic apnea distances: 75 meters and 100 meters.
  • Case observation of one diver experiencing blackout during a 100-meter dive.

Main Results:

  • Group SpO₂ decreased significantly with increasing dive distance, reaching a mean of 68% ± 9% at 100m.
  • Mean HR declined substantially during both dive distances, with no detected arrhythmias.
  • One diver experienced blackout at 51% SpO₂, with rapid recovery.
  • SpO₂ nadirs were consistent within divers across distances, unlike HR nadirs.

Conclusions:

  • Blackout can occur at SpO₂ levels around 50%, primarily driven by profound hypoxemia.
  • Absence of arrhythmias does not preclude blackout in breath-hold diving.
  • Individualized risk assessment using early desaturation patterns during submaximal dives is recommended.