Investigating the Bidirectional Associations of Adiposity with Sleep Duration in Older Adults: The English Longitudinal Study of Ageing (ELSA)

Cross-sectional analyses of adiposity and sleep duration in younger adults suggest that increased adiposity is associated with shorter sleep. Prospective studies have yielded mixed findings, and the direction of this association in older adults is unclear. We examined the cross-sectional and potential bi-directional, prospective associations between adiposity and sleep duration (covariates included demographics, health behaviours, and health problems) in 5,015 respondents from the English Longitudinal Study of Ageing (ELSA), at baseline and follow-up. Following adjustment for covariates, we observed no significant cross-sectional relationship between body mass index (BMI) and sleep duration [(unstandardized) B?=??0.28?minutes, (95% Confidence Intervals (CI)?=??0.012; 0.002), p?=?0.190], or waist circumference (WC) and sleep duration [(unstandardized) B?=??0.10?minutes, (95% CI?=??0.004; 0.001), p?=?0.270]. Prospectively, both baseline BMI [B?=??0.42?minutes, (95% CI?=??0.013; ?0.002), p?=?0.013] and WC [B?=??0.18?minutes, (95% CI?=??0.005; ?0.000), p?=?0.016] were associated with decreased sleep duration at follow-up, independently of covariates. There was, however, no association between baseline sleep duration and change in BMI or WC (p?>?0.05). In older adults, our findings suggested that greater adiposity is associated with decreases in sleep duration over time; however the effect was very small

Лапаротомия в системе лечения перитонитов

ПЕРИТОНИТ /ХИРБРЮШИНЫ БОЛЕЗНИ /ХИРЛАПАРОТОМИЯХИРУРГИЧЕСКИЕ ОПЕРАЦИИ /МЕТОДЫРЕЛАПАРОТОМИ

Sleep and the management of alertness

Sleep has received limited attention in economics and sleep duration is usually made exogenous and fixed in models of time allocation. In our framework sleeping involves investing in alertness but also a sacrifice of waking time. We show how the inter-temporal utility-maximization problem on the length of sleep is analogous to the optimality conditions for resource extraction. We then test the theoretical predictions that emerge from the model, which include the effects of labor market opportunities and having children, on sleep patterns