title: Physical fitness of the Czechoslovak population between the ages of 12 and 55 years. Pulmonary ventilation.
abstract: Examination of ventilation function in an average population showed that maximum minute ventilation in adults fell with advancing age. Males had higher values than females, the highest values being attained, in both sexes, at 18 (117 and 83 1/min respectively). Tidal volume during loading, expressed as a percentage of vital capacity, rose with advancing age in all groups of males and females (from 53% at 18 to 64% at 55 in males and from 51% to 59% in females). The ventilation equivalents for O2 and CO2 attained optimum values at a load of 100 W in males and at 50 W in females. On increasing the load they rose in both sexes--in females more than in males. Percentual utilization of O2 from the inspired air was greatest in males at a load of about 100 W (4.8--5%) and in females at about 50 W (4.3--4.8%). At higher loads it fell faster in females than in males. In males, the respiratory quocient attained the value 1 at a load of about 2 W/kg body weight and in females at 1.5 W/kg. At maximum loading it was over 1 in all the age categories. No differences between males and females were observed, but males, in maximum loading, gave the greatest absolute and the greatest relative performance.
mesh_terms: D000293:Adolescent; D000328:Adult; D002245:Carbon Dioxide; D002648:Child; D003604:Czechoslovakia; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D010100:Oxygen; D005082:Physical Exertion; D010809:Physical Fitness; D012119:Respiration; D012129:Respiratory Function Tests; D013990:Tidal Volume
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen