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Aim The present study examined the association between self-reported quality of sleep (QOS) and physical function in community-dwelling young-old adults. Methods This cross-sectional study included 737 community-dwelling older adults aged 60 years and older (498 women, 239 men); age 68.3 ± 5.2 years (range 60-79 years). Participants completed a self-administered questionnaire, which included the Pittsburgh Sleep Quality Index, as well as information regarding sociodemographic characteristics, physical activity, smoking and alcohol consumption. The χ2-test was used to compare categorical variables stratified by QOS, and the unpaired t-test was used for continuous variables for men and women separately. Furthermore, logistic regression analyses were carried out to verify the association between QOS and physical function measures. Results The unpaired t-test showed a significant difference (( P < 0.05) in the Timed Up and Go test and physical strength outcomes, which included: handgrip, quadriceps setting, knee extension and hip flexion strength between the good QOS and poor QOS groups among the men. However, the t-test results for physical function outcomes did not show a significant difference among the women. In the logistic regression model, after adjusting for age, sex and potential confounding factors, handgrip strength remained significantly associated with QOS (OR 0.96, 95% CI 0.92-1.00). Conclusion QOS was associated with physical function in young-old adults; those with good QOS were especially more likely to possess stronger grip strengths; however, further research is required to identify the temporal relationship. Geriatr Gerontol Int 2017; 17: 1808-1813. [ABSTRACT FROM AUTHOR]

Aim Quality of sleep ( QOS) has been shown to have an affect on mental and physical well-being, and quality of life. However, few studies have investigated how sleep affects mobility in older adults. The aim of the present study was to examine the relationship between QOS and mobility disorder ( MD) in community-dwelling older adults. Methods Data collected through self-administered questionnaires was analyzed for 4564 Japanese older adults. Sleep outcomes included two self-reported questions regarding QOS. Logistic regression analysis was used to analyze the association between sleep and MD both by the QOS questions independently and grouped together by the two QOS questions into three groups: often sleeps well and good awakening ( GG), does not often sleep well and bad awakening ( BB) and a group with one of each ( GB/ BG). Results After adjustment for age, sex and depression, both those who did not often sleep well and those with poor awakening were more likely to show MD ( OR 1.45, 95% CI 1.29-1.75), ( OR 1.77, 95% CI 1.50-2.08), respectively. When grouped by both questions, those in the BB group had the least favorable outcome with increased odds ratio for possessing a MD ( OR 1.95, 95% CI 1.61-2.37), compared with GB group ( OR 1.40, 95% CI 1.18-1.67). Conclusions Often sleeping well and good morning awakening were both associated with MD, suggesting that self reported QOS is associated with MD. Further research is required to investigate whether improving sleep quality could be a possible means of preventing and reversing MD in older adults. Geriatr Gerontol Int 2016; 16: 266-271. [ABSTRACT FROM AUTHOR]