What Researchers Did
Researchers examined how repeated, long dives affect lung function in divers breathing either air or oxygen, both at rest and during exercise.
What They Found
The study found that divers breathing oxygen during dives experienced more respiratory symptoms, with 56% of diver-days having symptoms during oxygen breathing with exercise (wetO2X) compared to 1-2% when breathing air. Lung function measures (FEV1 and FEF25-75) were lower the morning after and three days post-diving for those exposed to oxygen, especially with exercise, suggesting oxygen toxicity.
What This Means for Canadian Patients
This research provides insights into the potential effects of prolonged oxygen exposure under pressure on lung health. For Canadian patients undergoing hyperbaric oxygen therapy, it suggests that careful monitoring of lung function may be important, particularly with repeated or extended sessions. It highlights that oxygen toxicity can manifest as respiratory symptoms and changes in lung capacity.
Canadian Relevance
This study is not Canadian and does not have Canadian authors. However, it covers aspects related to decompression, which is a Health Canada-recognised indication for hyperbaric oxygen therapy (decompression sickness, arterial gas embolism).
Study Limitations
The study focused on a specific population of divers undergoing extreme dive profiles, which may not directly apply to all hyperbaric oxygen therapy patients.