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05-03-2016 | Uitgave 4/2016

Journal of Behavioral Medicine 4/2016

Insomnia symptoms and heart rate recovery among patients in cardiac rehabilitation

Tijdschrift:
Journal of Behavioral Medicine > Uitgave 4/2016
Auteurs:
Kristin J. Horsley, Codie R. Rouleau, Sheila N. Garland, Charles Samuels, Sandeep G. Aggarwal, James A. Stone, Ross Arena, Tavis S. Campbell

Abstract

Insomnia symptoms (i.e., difficulty falling asleep, difficulty staying asleep, and early morning awakenings) are common among people with cardiovascular disease, and have been linked to adverse cardiovascular health outcomes. Reduced parasympathetic tone is one pathway through which risk may be conferred. The purpose of this study was to evaluate whether insomnia symptoms are associated with lower parasympathetic tone in cardiac rehabilitation patients with suspected insomnia. Participants (N = 121) completed a self-report measure of insomnia severity. 1-min heart rate recovery (HRR), an index of parasympathetic tone, was obtained during a maximal exercise test. Difficulty falling asleep, but not difficulty staying asleep or early awakenings, was associated with attenuated 1-min HRR. When analyses were restricted to participants with moderate and severe insomnia severity (n = 51), the strength of this association increased. In a sample of cardiac rehabilitation patients with insomnia, only the symptom of difficulty falling asleep was associated with lower parasympathetic tone, suggesting that individual insomnia symptoms may show specificity in their associations with physiological mechanisms.

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