PMID: 6408046May 1, 1983Paper

Measurement of arterial blood gases at the transition from exercise to rest

Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
B M Lewis

Abstract

Arterial blood gas samples obtained 5-20 s after stair-climbing exercise were compared with samples taken during the last 30 s of exercise in 137 subjects. Arterial partial pressure of CO2 (PaCO2) did not change significantly, and in 110 subjects the two samples were within the analytical variation (+/- 2 Torr), supporting the cardiodynamic hypothesis of respiratory regulation. Exceptions to this response were 10 subjects who hyperventilated (PaCO2 less than 34) during exercise and 15 with severe obstruction [forced expiratory volume in 1 s (FEV1) less than 70% forced vital capacity (FVC), and FVC less than 70% of predicted] in whom PaCO2 increased significantly. Overall, arterial partial pressure of O2 (PaO2) increased an average of 3.49 Torr (P less than 0.001). In the two groups in which PaCO2 increased, postexercise PaO2 did not rise. In addition, duration of exercise affected PaO2 response. PaO2 increased significantly more after brief (less than 2 min) periods than after longer (4-6 min) exercise, and this difference increased only when subjects with normal or borderline ventilatory function were analyzed. In 13 subjects in whom a second sample was taken 30-45 s after exercise, the increase in PaO2 was progressive and aga...Continue Reading

Citations

May 3, 2000·Clinical Physiology·M S LeeH T Chung
Jan 11, 2019·European Clinical Respiratory Journal·Laurent Plantier, Christophe Delclaux

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