Comparison of oxygen uptake during bicycle exercise in patients with chronic heart failure and in normal subjects

摘要: Abstract Prediction of oxygen uptake ( V ˙ O 2 ) during exercise from relations established in normal subjects between and work load watts (W) may be inaccurate patients with chronic heart failure because these could manifest delayed kinetics at final stages exercise. To test the hypothesis that even low levels work, exhibit a lower than do subjects, 77 27 control or disease other underwent bicycle respiratory gas analysis. Work was increased by 10 W/min an initial 20 W. (ml/min per kg) measured every 15 s. The Δ / W ratio significantly reduced only most severely impaired class C-D (8.75 ± 2.14 versus 11.05 0.38, p Even incremental rate protocol, compared sedentary without failure, demonstrate uptake. This observation suggests presence anaerobic metabolism uptake, both; accordingly, indirect estimates requirements derived intensity duration such are overestimated.