A Compositional Analysis of Physical Activity, Sedentary Time, and Sleep and Associated Health Outcomes in Children and Adults with Cystic Fibrosis
Mayara S. Bianchim; Melitta A. McNarry; Anne Holland; Narelle S. Cox; Julianna Dreger; Alan R. Barker; Craig A. Williams; Sarah Denford; Kelly A. Mackintosh
This study sought to investigate the association of light physical activity (LPA), moderate-to-vigorous physical activity (MVPA), sedentary time (SED), and sleep with lung function in children and adults with CF. In total, 86 children (41 females: 13.6 ±: 2.8 years: FEV1%predicted: 86 ±: 1%) and 43 adults (21 females: 24.6 ±: 4.7 years: FEV1%predicted: 63 ±: 21%) with CF participated in this study. Wrist-worn accelerometery was used to assess PA, SED and sleep. Compositional linear regression models were conducted following normalisation via isometric log-ratio transformations. Sequential binary partitioning was applied to investigate the impact of reallocating 10 to 30 min between each behaviour on FEV1%predicted. A decline in FEV1%predicted was predicted with the reallocation of 30 min from MVPA to SED or LPA or sleep to any other behaviour in children (&minus:3.04&ndash:&minus:0.005%) and adults (&minus:3.58&ndash:&minus:0.005%). Conversely, improvements in FEV1%predicted were predicted when 30 min was reallocated to MVPA from LPA or SED in children (0.12&ndash:1.59%) and adults (0.77&ndash:2.10%), or when 30 min was reallocated to sleep from any other behaviour in both children (0.23&ndash:2.56%) and adults (1.08&ndash:3.58%). This study supports the importance of MVPA and sleep for maintaining and promoting lung function in people with CF.
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