Arterial blood gas changes in progressively deeper breath-hold dives - PubMed
4 hours ago
- #Lung compression
- #Breath-hold diving
- #Arterial blood gases
- Arterial PO2 (PaO2) and PCO2 (PaCO2) spike during deep breath-hold dives due to lung compression by water pressure.
- Study involving elite divers to 20, 40, 60, and 80m found PaO2 peak at 40m (mean 29.3 kPa) and PaCO2 plateaued at 40-60m then rose at 80m.
- Compression effect appears maximal at 40m (~5 atm), possibly due to lungs compressed to near residual volume.
- Beyond 40m, PaO2 decreases through metabolism and PaCO2 increases via metabolic accumulation.
- Results suggest spike in arterial gases linked to lung compression until greatest proportional volume changes occur.