Cardiorespiratory fitness on a treadmill in an adult cystic fibrosis population.

Objectives: (1) To describe the cardiorespiratory fitness (CRF) in an adult cystic fibrosis population related to sex and age, (2) to evaluate the cause of low CRF and (3) to study the association between peak oxygen uptake (VOpeak) and forced expiratory volume in 1 s (FEV).

Methods: A total of 204 cardiopulmonary treadmill exercise tests (CPETs) performed by 116 patients were included. VOpeak, gas exchange, heart rate, oxygen saturation and ventilatory variables were measured.