Effects of inspired CO2 and of resistance on exercise endurance were tested dry at sea level. Resistance R was designed to mimic that of the MK 16 underwater breathing apparatus (UBA) at 50 feet of seawater. The MK 16 UBA has turbulent inspiratory and laminar expiratory pressure drops. At the design flow, expiratory pressure was twice inspiratory pressure. Endurance was assessed as duration of exercise on a bicycle ergometer at ...
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