Comprehensive Performance Limits for Divers' Underwater Breathing Gear: Consequences of Adopting Diver-Focused Limits

Work of Breathing Limits for Heliox Breathing

“…Value Wood, Bryan; 11 peak flow Wood, Bryan, 11 at 75 to 25% vital capacity Wood, Leve and Workman 8 Anthonisen et al, 10 at 50% vital capacity Anthonisen et al; 10 The maximum WOB/V T that can consistently be sustained from respiratory muscles has empirically been determined to be 4.29 kPa. 2 This value, in combination with eq. 1, shows that the maximum WOB/V T to overcome the internal work of breathing with air at 1 atmosphere absolute (ata) is 4.29 -2.99 = 1.30 kPa.…”

“…For a rebreather UBA the goal at 62.5 L/min was 1.542 kPa and the previously allowed NEDU standard deviation was 0.2 kPa 2. Assume a sample of five UBAs.…”