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Correlations between post-intervention forced expiratory volume 1.0 second (FEV1.0) and exercise ventilatory equivalent for CO2 production (V̇e/V̇CO2) in control (dark symbols) and asthmatic (open symbols) subjects. There was no relationship between post-intervention FEV1.0 and V̇e/V̇CO2 in either control or asthmatic subjects. Circles, control trial; squares, bronchodilation trial; diamonds, sham trial; triangles, bronchoconstriction trial.
