title: Recirculation times in exercising children.
abstract: Recirculation times were measured with indicator-dilution methods in 19 subjects, aged 5--14 yr, during near-maximal supine bicycle exercise. Recirculation times were as short as 4.5 s and peak recirculation occurred within 10 s. When rebreathing methods are used to measure exercise cardiac output in children, their very rapid recirculation needs to be considered.
mesh_terms: D000293:Adolescent; D002245:Carbon Dioxide; D002302:Cardiac Output; D002648:Child; D002675:Child, Preschool; D006339:Heart Rate; D006801:Humans; D005082:Physical Exertion; D012119:Respiration
chemical_list: D002245:Carbon Dioxide