Key result
Daytime napping linked to ~4 µm wider CRAE versus no nap.
Why the study?
The association between daytime napping and retinal microcirculation was not well understood.
Is daytime napping associated with improved retinal microcirculation in a general population?
Cross-Sectional (n=2,662)
Is daytime napping associated with improved retinal microcirculation in a general population?
Self-reported daytime napping of 0.5-1 hour is associated with wider central retinal arteriolar equivalent and a lower risk of arterio-to-venous ratio reduction, suggesting a potential beneficial role on microcirculation.
Answers are grounded in this paper and cite their sources.
0.5–1 h napping was associated with better retinal calibers; hypothesis-generating for microcirculation benefits, prospective studies needed before practice implications.
STUDY OBJECTIVES: To investigate the association between daytime napping and retinal microcirculation. METHODS: This is a cross-sectional study from a prospective population-based cohort. 2,662 participants were recruited after quota sampling. Information on napping was collected through face-to-face interviews. Retinal vascular calibers (RVCs), including central retinal arteriolar equivalent (CRAE), central retinal venular equivalent (CRVE), and arterio-to-venous ratio (AVR), were obtained from fundus photography. Multivariate regression and restricted cubic spline curve were performed to determine the association between RVCs and daytime napping duration. RESULTS: 56.4% participants reported daytime napping regularly. Compared to no nap, daytime nap was related to higher CRAE, with nap duration of 0.5-1 h showing the most significant association. 0.5-1 h daytime nappers displayed an average of 4.18 µm (95% confidence interval [CI] 2.45-5.91, p < 0.001) wider CRAE than non-nappers after adjustment. No significant association was found between CRVE and daytime napping. Moreover, individuals with 0.5-1 h daytime napping had a lower risk for AVR reduction (odds ratio [OR] 0.70, 95% confidence interval [CI] 0.56-0.86, p = 0.001) than non-nappers. Similar association persisted in non-hypertensive population. Restricted cubic spline indicated a J-shaped relationship between AVR reduction and nap duration. CONCLUSION: Retinal microcirculation was positively associated with self-reported 0.5-1 h daytime napping. Better indicators of retinal microcirculation were probably related to nap duration in a J-shaped manner. Also, the possibly beneficial role of 0.5-1 h daytime napping on retinal microcirculation might be independent of clinically diagnosed vascular diseases.
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Liu et al. (2021) reported a cross-sectional. Daytime napping (0.5-1 h) vs. No nap was evaluated on Central retinal arteriolar equivalent (CRAE) (MD 4.18 µm, 95% CI 2.45-5.91, p=< 0.001). Daytime napping for 0.5-1 hour was associated with a 4.18 µm wider central retinal arteriolar equivalent compared to no nap.
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