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Studies in children with cystic fibrosis (CF) suggest greater physical activity (PA) is associated with a slower rate of decline in respiratory function. In adults with CF, objectively measured PA time and its relationship to long‐term clinical outcomes of respiratory function and need for hospitalization are unknown.

PA measured objectively (SenseWear armband), pulmonary function, exercise capacity (Modified Shuttle Test‐25) and CF‐related quality of life (CFQ‐R) were assessed in 65 adults (34 male; mean age 28 years) with CF during a stable phase. A sub‐group of these participants undertook additional measurement of PA at hospital discharge for a respiratory exacerbation.

Median daily habitual moderate‐vigorous PA (MVPA) time was 31‐min (IQR:15–53). Participants who accumulated ≥30‐min MPVA daily experienced fewer hospital days (P = 0.04), better …