Studies on respiratory failure in pulmonary tuberculosis. (The second report). Exercise test.:-Exercise Test-

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To elucidate the exercise tolerance, 18 patients with healed tuberculosis (mean age=52.1 years, C group), 12 patients with old pleuritis or previous operations (mean age=64.2 years, P1+Op group) and 9 normal subjects (mean age=57.2 years, N group) were studied during exercise by bicycle ergometer.The workload (W1) was set initially at 100 watts and increased to 600 watts depending on the subjects tolerance. Arterial blood gases, blood lactate and heart rate (HR) were measured before and during the exercise. In C group and N group, PaO2 increased during W1 with 300 to 600 watts but in P1+Op group, PaO2 decreased during W1 with 150 or 400 watts and PaCO2 increased during W1 with 100 to 150 watts. The initial high blood lactate during exercise was found at 400 watts in N group, at 300 watts in C group and at 100 watts in P1+Op group. We presumed the anaerobic threshold (At) at lactate level 40mg/dl during exercise. About At in each group, W1 and HR were 400 watts and 130/min. in N group, 300 watts and 127/min, in C group and 100 watts and 127/min. in P1+Op group.
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