August 18, 2017
1 min read

Sleep time, quality linked to cardiometabolic syndrome in black adults

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Black patients who have less sleep and lower sleep efficiency had increased cardiometabolic risk compared with white patients, according to a study.

David S. Curtis, a graduate student in the department of human development and family studies at Auburn University College of Human Sciences in Alabama, and colleagues reviewed data from 426 participants (mean age, 57 years; 61% women; 31% black) from the MIDUS study.

Actigraphy was used to monitor participants’ total sleep time and sleep efficiency for 7 nights. Cardiometabolic risk was measured as a composite of BP, waist circumference, insulin resistance, HbA1c, HDL, triglycerides and C-reactive protein.

Data from a group of patients without diabetes or heart disease were also reviewed to reduce the possibility of reverse causality.

Black participants had 340.6 minutes of total sleep time vs. 381.3 minutes in white participants (P < .001). Sleep efficiency was also reduced in black participants (72.3%) compared with white participants (82.2%; P < .001). The race disparity regarding cardiometabolic syndrome was linked to sleep time (41%) and sleep efficiency (58%).

Black women had 9.1% lower sleep efficiency and less sleep by 0.75 hours compared with white women (P < .001 for both). Among women, race was indirectly associated with the risk for cardiometabolic syndrome by sleep efficiency (65%) and time (33%).

In the group without diabetes or heart disease, race was indirectly related to the risk for cardiometabolic syndrome by sleep time (regression coefficient = 0.05; 95% CI, 0.02-0.11).

“Importantly, sleep is a malleable behavior that can be improved through behavioral and educational interventions to influence physical health,” Curtis and colleagues wrote. “Further, despite limited information regarding nonclinical samples, sleep interventions have been shown to be cost-effective. Thus, recent public health initiatives that include monitoring sleep behaviors and society-wide messaging about adequate sleep duration and sleep hygiene represent important progress.” – by Darlene Dobkowski

Disclosures: The authors report no relevant financial disclosures.