Social interaction and sleep as possible mechanisms of the association between loneliness and increased blood pressure

Abstract

Previous research has found that loneliness is associated with increased blood pressure in old adults (Hawkley, Masi, Berry, & Cacioppo, 2006; Hawkley, Thisted, Masi, & Cacioppo, 2010). However, later studies suggested that this association between loneliness and blood pressure may not be replicable. The present study examined whether there was an association between loneliness and blood pressure in a sample of 391 mid-aged and older adults (SHINE: Study of Health and Interactions in the Natural Environment), with loneliness measured by UCLA Loneliness Scale-Revised and blood pressure assessed during a four-day ambulatory monitoring study. Moreover, building on the loneliness model proposed by Hawkley and Cacioppo (2010), the current study examined whether social interaction quality and sleep may explain such a link between loneliness and increased blood pressure in this sample, with social interaction quality measured by ecological momentary assessment and sleep measured objectively by actigraphy and subjectively by the Pittsburgh Sleep Quality Index. Findings showed that loneliness was not associated with blood pressure in mid-aged and older adults after controlling for age, sex, race, and education. Loneliness was also not related to Actigraphy-assessed sleep (total sleep time and sleep efficiency). However, loneliness was significantly related to lower self-reported sleep quality as well as to lower social interaction positivity and higher social interaction negativity among participants in daily life. The results of the current study have implications for current models of loneliness, social interactions, and health

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