Pulmonary gas exchange during exercise in women: effects of exercise type and work increment

• DOI: 10.1152/jappl.2000.89.2.721
• Publication Date: 2017-12-23T01:40:40Z
• Authors: Susan R. Hopkins; Rebecca C. Barker; Tom D. Brutsaert; Timothy P. Gavin; Pauline Entin; Ivan M. Olfert; Susan Veisel; Peter D. Wagner
• Keywords: Treadmill; Arterial blood; Physical exercise

Exercise-induced arterial hypoxemia (EIAH) has been reported in male athletes, particularly during fast-increment treadmill exercise protocols. Recent reports suggest a higher incidence women. We hypothesized that 1-min incremental (fast) running (R) protocols would result lower Po 2 (Pa O ) than 5-min increment (slow) or cycling (C) and women experience greater EIAH previously for men. Arterial blood gases, cardiac output, metabolic data were obtained 17 active [mean maximal uptake (V˙o max = 51 ml · kg −1 min ]. They studied random order (C R), with fastV˙o protocol. After recovery, the performed 5 of at 30, 60, 90% ofV˙o (slow). One week later, other mode (R C) was similarly studied. There no significant differences V˙o between R C. Pulmonary gas exchange similar rest, 30%, 60% . At , Pa (mean ± SE 94 Torr) C (105 Torr, P < 0.0001), as ventilation (85.2 3.8 vs. 98.2 4.4 l/min btps, 0.0001) output (19.1 0.6 21.1 1.0 l/min, 0.001). Pco (32.0 0.5 30.0 0.001) alveolar-arterial difference (A-aDo ; 22 16 R. A-aDo slow fast. Nadir ≤80 Torr four (24%) but only fast-R. In all subjects, atV˙o 95% prediction limit calculated from available men ( n 72 38 R) both These intrinsic C, due to also efficiency exchange. The responses our subjects do not differ significantly those observed