What Researchers Did
Researchers studied 10 men to see if cycling exercise performed 2 or 24 hours before a simulated dive could reduce the number of gas bubbles in their blood after decompression.
What They Found
The study found that pre-dive cycling exercise did not reduce the maximum number of circulating gas bubbles; the median maximum KM grade was 2+ for the control dive and 3 for both exercise dives. Furthermore, bubbles disappeared more slowly after exercise dives, taking 225 minutes for the 2-hour exercise group and 165 minutes for the 24-hour group to clear, compared to 120 minutes for the control.
What This Means for Canadian Patients
For Canadian divers, these findings suggest that cycling exercise performed 2 or 24 hours before a dive may not reduce the risk of venous gas emboli, which are associated with decompression sickness. Divers should continue to prioritize established safety protocols rather than relying on this type of pre-dive exercise for bubble reduction.
Canadian Relevance
This study covers decompression sickness, a Health Canada-recognised indication for hyperbaric oxygen therapy.
Study Limitations
The authors acknowledged that factors such as the specific type of exercise, participants' prior diving experience, and variations in Doppler measurement techniques might have influenced the study's outcomes.