[Sports fitness in XXXX ].

@entity1 @entity82 @entity26 @entity120 @entity1757 @entity3885 @entity515 @entity519 @entity358 @entity1002
In @entity1 with @entity120 caused by a large @entity1757 , the cardiopulmonary performance capacity (CPC) depends on the relation of @entity358 . Changes in this relation occurring on exercise are mainly due to an exercise - induced fall of the systemic vascular resistance. If the ratio of pulmonary to systemic resistance is below 1 at maximal exercise, the CPC is reduced as a result of the @entity1002 . In case of a pulmonary to systemic resistance ratio of higher than 1 at maximal exercise @entity519 will be a limiting factor. Only in cases of a moderate degree of pulmonary vascular changes, resulting in a relation of resistances at maximal exercise in the range of 1, will the CPC be normal. @entity1 with @entity120 always present with reduced CPC as a main symptom. Cardiac output cannot be adequately increased during exercise. Only by excessive peripheral @entity26 desaturation can a certain adaptation to the @entity26 demand of the exercising organism be possible to a certain degree, though only at low work rates. Uneven perfusion and the corresponding ventilation-perfusion inequality are only moderate. However, due to the widened arterial-venous @entity26 difference, ventilation-perfusion inequality with its distinct alveolar-arterial @entity26 pressure difference can result in a considerable degree of venous admixture. In adolescents, @entity120 caused by @entity3885 is seen almost only in @entity1 with advanced stages of cystic @entity82 . It is then combined with increased venous admixture, and often with @entity515 -retention.(ABSTRACT TRUNCATED AT 250 WORDS)
