Association between self-reported sleep duration and serum vitamin D level in elderly Korean adults

• Autores: Jeong Hong Kim, Jung Hyun Chang, Dong Young Kim, Ju Wan Kang
• Localización: Journal of the American Geriatrics Society, ISSN 0002-8614, Vol. 62, Nº. 12, 2014, págs. 2327-2332
• Idioma: inglés
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• Resumen

  • Objectives: To investigate the association between self-reported sleep duration and serum vitamin D level in elderly Korean adults.

    Design: Cross-sectional data analysis.

    Setting: Korean National Health and Nutrition Examination Survey 2010.

    Participants: Noninstitutionalized adults aged 60 to 80 (N = 1,614).

    Measurements: The confounding variables were serum 25-hydroxy vitamin D level, age, sex, body mass index, smoking history, alcohol consumption, and self-reported daily sun exposure and sleep duration. Self-reported daily sleep duration was divided into four groups: Q1 (≤4 hours), Q2 (5–6 hours), Q3 (7–8 hours), and Q4 (≥9 hours).

    Results: Mean serum vitamin D levels of subjects in the Q1, Q2, Q3, and Q4 groups were 44.18, 48.08, 48.83, and 51.78 nmol/L, respectively. On multivariate linear regression analysis, subjects in the Q2 (B = 3.80, 95% confidence interval (CI) = 0.42–7.19), Q3 (B = 4.89, 95% CI = 1.54–8.24), and Q4 (B = 5.18, 95% CI = 0.78–9.58) groups had significantly higher serum vitamin D levels than subjects in the Q1 group.

    Conclusion: Serum vitamin D level is positively associated with self-reported daily sleep duration in elderly Korean individuals. These results suggest that inadequate sleep duration may be associated with lower vitamin D levels in elderly adults.