EFFECTS OF BREATHING THROUGH EXTERNAL DEAD SPACE ON VENTILATION AT REST AND DURING EXERCISE .2.

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Abstract
A new noninvasive monitor of ventilation, the respiratory inductive plethysmograph, was used to determine the effects of breathing through a mouthpiece (with nose clip) and breathing through external dead spaces on ventilation at rest and during exercise. Six normal young [human] subjects were studied during 5 min sequential periods of rest, submaximal exercise on a bicycle at a work load of 800 kg/min and recovery. The imposition on the respiratory system of breathing through a mouthpiece (with nose clip) and with external dead spaces of 150, 250 and 350 ml produced progressively greater ventilation than natural breathing during rest and submaximal bicycle exercise. When the actual tidal volumes were corrected for the increase in ventilation caused by the external dead space, ventilation both at rest and during exexcise with mouthpiece breathing still remained higher than natural breathing. Breathing through a mouthpiece (with nose clip) and breathing through external dead spaces apparently stimulate ventilation both at rest and during exercise.