Hemodynamic Characteristics During Treadmill and Bicycle Exercise in Chronic Heart Failure : Mechanism for Different Responses of Peak Oxygen Uptake

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The exercise capacity of patients with chronic heart failure(CHF) is greater when assessed by the treadmill rather than the bicycle ergometer, but the mechanism of this difference has not been clarified. The present study aimed to determine the difference between the hemodynamics of these exercise modes and the mechanism underlying the different peak oxygen uptake(VO_2). Patients(n=18)underwent a bicycle test and treadmill test using individual ramp protocols. Respiratory gas analysis and hemodynamic measurements with an opti-catheter were performed during both exercise tests. The peak VO_2 was significantly larger in the treadmill test than the bicycle test(1410±292 vs 1630±331 ml/min, p<0.001). Both the peak cardiac output(Q; 10.2±2.2 vs 10.9±2.1 L/min, p<0.001)and the peak arteriovenous oxygen difference(a-v O_2 diff; 13.9±1.5 vs 15.0±1.2 vol%, p<0.001)were also significantly higher in the treadmill test. The relative contribution of Q and a-v O_2 diff to the increased peak VO_2 was equivalent, which suggests that both Q and a-v O_2 diff. Contribute equally to the different peak VO_2 responses in CHF.
社団法人日本循環器学会の論文
1999-11-20