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Studies have found associations between sleep, nap duration, and bone mineral density (BMD). However, the longitudinal relationship between sleep, nap duration, and BMD has not been explored. We evaluated the association between the change in sleep and nap duration and BMD in Mexican adults. Data come from 1,337 adult participants of the Health Workers Cohort Study (341 were men and 996 were women, including 450 women < 45 years old and 546 ≥ 45 years old), with two study waves. At each wave, sleep and nap duration was assessed using self-administered questionnaires and BMD in g/cm was determined by dual X-ray absorptiometry. We used fixed-effect regression models stratified by sex and adjusted for BMI, diet, physical activity, vitamin supplements, and hormone replacement therapy. Women who changed from < 7 to ≥ 7 h/day of sleep from baseline to follow-up were associated with increases in the total hip (β = 0.012 g/cm; 95% CI: 0.002, 0.022) and lumbar spine BMD (β = 0.024 g/cm; 95% CI: 0.009, 0.039). Furthermore, most of these associations were observed in women ≥ 45 years. For women, a changing from 0 to > 60 min/day of napping was associated with a significant increase in total hip BMD of 0.012 g/cm (95% CI: 0.004, 0.024) and lumbar spine BMD of 0.027 g/cm (95% CI: 0.009, 0.045). No significant associations were observed for men. Our results suggest that increased sleep and nap duration are associated with gains in BMD in Mexican women, emphasizing sleep's role in promoting bone health and supporting established recommendations.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11153263 | PMC |
http://dx.doi.org/10.1007/s00223-024-01224-1 | DOI Listing |
Sleep
December 2024
School of Health and Society, University of Wollongong, Australia.
Study Objectives: To examine 1) multidimensional sleep profiles in pre-schoolers (3-6 years) across geocultural regions and 2) differences in sleep characteristics and family practices between Majority World regions (Pacific Islands, Sub-Saharan Africa, Eastern Europe, Northeast Asia, Southeast Asia, South Asia, the Middle East and North Africa, Latin America) and the Minority World (the Western world).
Methods: Participants were 3507 pre-schoolers from 37 countries. Nighttime sleep characteristics and nap duration (accelerometer: n=1950) and family practices (parental questionnaire) were measured.
Sci Rep
December 2024
Department of Urology, Lu'an People's Hospital of Anhui Province, Lu'an Hospital of Anhui Medical University, Lu'an, China.
Urolithiasis is a common and recurrent condition in the urological spectrum. Despite various proposed mechanisms, the causal relationship between sleep traits and the risk of urolithiasis remains unclear. We used publicly available genome-wide association study (GWAS) summary data from the UK Biobank and FinnGen to perform a two-sample Mendelian randomization (MR) analysis and genetic correlation analysis, evaluating the causal relationship and genetic correlation between sleep traits (chronotype, getting up in the morning, sleep duration, nap during the day, and insomnia) and urolithiasis (calculus of the kidney and ureter, and calculus of the lower urinary tract).
View Article and Find Full Text PDFBMC Geriatr
December 2024
The School of Nursing, Fujian Medical University, Fuzhou, 35000, China.
Background: Social participation (SP) affects the physical and mental health of older adults. Post-lunch napping is a prevalent lifestyle practice observed among older adults, and it may have an impact on their SP. However, research that explores the association between these factors is limited, and we thus aimed to examine this association.
View Article and Find Full Text PDFSleep Med
December 2024
Department of Nutrition and Food Hygiene, School of Public Health, Institute of Nutrition, Fudan University, Shanghai, China. Electronic address:
Background: Evidence on the potential effects of midday napping on risk of stroke in Chinese populations remains limited.
Objectives: We aimed to prospectively investigate the association between midday napping and risk of subsequent stroke and stroke subtypes in the Kailuan study.
Methods: Midday napping duration was obtained from a self-reported questionnaire.
Sleep Med
December 2024
West China School of Nursing, Sleep Medicine Center, Mental Health Center, National Clinical Research Center for Geriatrics, Nursing Key Laboratory of Sichuan Province, West China Hospital, Sichuan University, Chengdu, 610041, PR China. Electronic address:
Objective: To evaluate the instant impact of transcranial alternating current stimulation (tACS) on sleep brain oscillations.
Methods: Thirty-six healthy subjects were randomly assigned to receive tACS and sham stimulation in a crossover design separated by a one-week washout period. After stimulation, a 2-h nap polysomnography (PSG) was performed to obtain Electroencephalogram (EEG) data and objective sleep variables, and self-reported subjective sleep parameters were collected at the end of the nap.
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