Journal of cystic fibrosis : official journal of the European Cystic Fibrosis Society
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We aimed to characterize the cardiopulmonary response during a 1-min sit-to-stand (STS) test and compare peak exercise cardiorespiratory variables to a maximal cardiopulmonary exercise test (CPET) in cystic fibrosis (CF). We further aimed to assess the validity of the STS power index (PowerSTS) as a measure of exercise capacity. ⋯ The 1-min STS test elicits a substantial but lower cardiorespiratory response compared to a maximal cycle ergometry CPET. While PowerSTS and STS repetitions are both valid outcome measures of functional capacity, STS repetitions are clinically more practical.