Association of sleep parameters with kidney function: analysis of baseline data from 9216 adults in the Fasa Adult Cohort Study (FACS)
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Abstract
Background: The evidence on the impact of sleep parameters on kidney function and chronic kidney disease (CKD) risk is inconsistent and warrants further research across diverse populations. Our study investigates the relationship between sleep and kidney function in both healthy individuals and those with CKD.
Methods: This cross-sectional study analyzed data from 9216 adults aged 35-70. Various sleep parameters were assessed and calculated using the Pittsburgh Sleep Quality Questionnaire. Kidney function was assessed by estimated glomerular filtration rate (eGFR), with CKD characterized as eGFR < 60 mL/min/1.73 m2. Multiple linear regression was used in the statistical analysis to account for significant confounding variables.
Results: In general, sleep duration (β: 0.18, 95% CI0.06, 0.30, p value < 0.001) and sleep efficiency (β: 0.03, 95% CI 0.01, 0.05, p value = 0.02) were positively correlated with GFR, while sleep latency (β: - 0.01, 95%CI - 0.02, 0.00, p value < 0.001) and daily naps (β: - 1.33, 95%CI - 1.76, - 0.90, p value < 0.001) were negatively correlated with GFR. Similarly, for those without CKD, sleep duration (β: 0.23, 95%CI 0.1, 0.36, p value < 0.001) and sleep efficiency (β: 0.04, 95%CI 0.01, 0.06, p value = 0.002) positively and sleep latency (β: - 0.01, 95%CI - 0.02, 0.00, p value = 0.002) and daily naps (β: - 1.02, 95%CI - 1.65, - 0.74, p value < 0.001) negatively were correlated with GFR. These associations were not significant in individuals with CKD. Conclusion: Enhancing sleep duration, decreasing sleep latency, improving sleep efficiency, and minimizing daytime napping could potentially boost kidney function. The linear relationships suggest that even slight changes in sleep could affect GFR in non-CKD individuals. Although our statistically significant effect sizes show a small clinical impact, their consistent association warrants further exploration over longer periods with longitudinal studies, to assess if improving sleep can prevent declining renal function, potentially delaying the onset of renal issues in non-CKD populations.
Keywords: Adult; Chronic kidney disease; Glomerular filtration rate; Renal function; Sleep quality.
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Bushehr Elderly Health (BEH) programme: study protocol and design of musculoskeletal system and cognitive function (stage II)
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Introduction: Musculoskeletal disorders and cognitive diseases are prevalent, and they are significant determinants of morbidity and mortality in older adults. The aim of this study is to investigate the prevalence of musculoskeletal and cognitive diseases and their risk factors and also to assess their associations during future follow-ups.
Methods and analysis: Bushehr Elderly Health (BEH) programme is a population-based prospective cohort study being conducted in Bushehr, a southern province of Iran. A total of 3000 older people aged ≥60 years participated in the first stage from which 2772 were eligible to participate in the second stage, which started after 2.5 years. Data including demographic status, lifestyle factors, general healthandmedical history, and mentalandfunctional health are collected through a questionnaire. Anthropometric measures, performance testsandmuscle strength, blood pressure and and body composition measurements are done. A total 25 cc venous blood is taken, and sera are stored at -80°C for possible future analyses.
Ethics and dissemination: The study protocol was approved by the ethics committee of Endocrinology and Metabolism Research Institute, affiliated to Tehran University of Medical Science as well as the Research Ethics Committee of Bushehr University of Medical Sciences. A written informed consent was signed by all the participants. The study findings will show the prevalence of musculoskeletal disease, cognitive impairment and their risk factors in an elderly population. The participants will be followed during the study to measure the occurrence outcomes.This study will also have the potential to inform the development of beneficial interventions to improve the management of musculoskeletal and cognitive impairment in Iran and other countries in the Middle East.Our findings will be disseminated via scientific publication as well as presentation to stakeholders, including the patients, clinicians, the public and policymakers, via appropriate avenues.
Keywords: cognitive function; elderly; musculoskeletal system; protocol.
