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Ventilatory function and respiratory-limited exercise tolerance in pulmonary tuberculosis.

. Correlations of respiratory-limited physical working capacity with FEV1.0, VC and airways obstruction have been studied in a series of 170 male and 38 female patients with pulmonary tuberculosis. Statistically significant positive correlation was established for exercise tolerance with FEV1.0 and VC. Exercise tolerance displayed significant correlation with airways obstruction in such a way that the obstructive patients of both sexes showed, on average, a better working capacity than the non-obstructive patients when the material was FEV1.0-standardized. This was attributed to probable bronchial relaxation and shift of the respiratory midposition towards higher lung volumes among the obstructive patients in exercise. Significant negative correlation with airways obstruction was established in a VC-standardized male group.