The temporal relationships between sleep, cortisol, and lung functioning in youth with asthma
Margaret D Hanson1, Edith Chen
1Department of Psychology, University of British Columbia, Vancouver, Canada. hansonm@psych.ubc.ca
Objectives:
This study tested the directionality of the association between sleep and health outcomes in youth with asthma.
Method:
Thirty-eight youth with asthma (aged 9-19) completed a daily diary study on sleep, asthma symptoms, peak expiratory flow (PEF) measures, and salivary cortisol samples.
Results:
Greater quantity of sleep predicted lower PEF% [beta(32) = -.33, p =.02], and lower daily cortisol output [beta(33) = -.31, p =.07] the following day. Additionally, poorer self-reported sleep quality predicted more severe symptoms the next day [beta(33) =.27, p =.05]. In contrast, PEF%, cortisol, and asthma symptoms did not significantly predict self-reported sleep quantity or quality the next night.
Conclusions:
Results suggest that sleep may affect subsequent health outcomes, rather than asthma impacting subsequent sleep, indicating the potential benefits of targeting sleep behaviors in youth with asthma.
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