The oxygen uptake efficiency slope is not a valid surrogate of aerobic fitness in cystic fibrosis.
Craig A WilliamsOwen William TomlinsonLucy V ChubbockDaniel StevensZoe Louise SaynorPatrick J OadesAlan R BarkerPublished in: Pediatric pulmonology (2017)
The OUES is not a valid (sub) maximal measure of V̇O2max in children and adolescents with mild-to-moderate CF. Clinicians should continue to use maximal markers (ie, V̇O2max ) of exercise capacity.