The aims of this study were to evaluate the feasibility of successive diffusing capacity of the lung for carbon monoxide (DLCO) measurements during two different exercise tests (upright cycling), and to compare the relationships between DLCO and pulmonary blood flow (Qc). Eight healthy subjects performed an incremental test (1-min step) and a strenuous 30-min intermittent-work exercise test (4 min at low and 2 min at high workload). Intrabreath DLCO and Qc were calculated by assessing the uptake of CO and C2H2 during exhalation. DLCO could be measured reliably up to 73-90% of peak oxygen consumption (VO2) during the incremental test, and up to 85-95% of peak VO2 during the intermittent test. The coefficients of variation of DLCO and Qc measured during two successive constant-load exercise tests were 5-6% and 7-11%, respectively. The highest values of DLCO, Qc and VO2 measured during the incremental and intermittent tests were similar (56 and 51 mL/mmHg/min for DLCO, 18.7 and 18.3 L/min, for Qc and 2.4 and 2.3 L/min for VO2, respectively). The main observed result was that the linear relationships between DLCO and Qc were similar whatever the exercise type. This allows DLCO comparisons, with regards to Qc, during different exercise protocols.
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