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Circulatory and Respiratory Response to Exercise With Added Respiratory Dead Space

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Zatoń M., Smołka Ł.

Human Movement

2011

vol. 12

issue 1

88-94

Purpose. Assessment of circulatory and respiratory response to separate exercise tests under the condition of increasing the volume of added respiratory dead space by 200 cm3 at a time. Basic procedures. Human volunteers performed 10 minutes of cycle ergometer exercise on nine occasions, with the increasing volume of added dead space at the intensity of 100 Watt. Main findings. The ventilatory parameters tended to increase proportionally to the volume of added dead space. VE, VT, RF increased from 29.35 ± 4.01; 1.62 ± 0.29; 18.52 ± 4.76 (at 0 cm3) to 62.42 ± 8.33; 2.43 ± 0.24; 26.00 ± 5.51 (at 1600 cm3), respectively. There were not any significant differences among the post-exercise values of LA, pO2, HCO-3act, BE(B) and HR. All the values of O2 SAT ranged between 94.87 ± 1.19 and 95.72 ± 0.76, and the values of HCO-3std between 25.23 ± 1.36 and 24.00 ± 0.78. The post-exercise values of pH decreased, and pCO2 increased proportionally to the volume of added dead space, from 7.41 ± 0.01 (at 0 cm3) to 7.33 ± 0.03 (at 1600 cm3) and from 40.89 ± 2.27 (at 0 cm3) to 51.13 ± 3.39 (at 1600 cm3), respectively. Conclusions. Added respiratory dead space evokes: increase in pulmonary ventilation, mainly in tidal volume; increase in arterial carbon dioxide pressure and decrease in pH, proportionally to the increase in dead space volume. Added dead space neither evokes hypoxemia nor intensifies anaerobic reproduction of ATP.

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Circulatory and Respiratory Response to Exercise With Added Respiratory Dead Space