The author reports data on 1120 patients with acute pneumonia. Age of the patients varied from 19 to 23 years. Complex treatment resulted in 52.7% of patients in normalization of clinico-roentgenological, laboratory findings and ventilation capacity of the lungs while 30.3% retained asthenic syndrome within 2-3 weeks after discharge from the hospital, 17% showed moderate disorders of the ventilatory pulmonary function before discharge from the hospital. For normalization of pulmonary ventilation rehabilitation measures were carried in out-patient conditions from 3 to 10 months. Determination of spirographic rates and spirographic bicycle ergometry are valuable criteria in assessment of the functional rehabilitation of the above category of patients.