dc.contributor.author |
Brychta, Robert J. |
dc.contributor.author |
Arnardottir, Nanna Yr |
dc.contributor.author |
Johannsson, Erlingur |
dc.contributor.author |
Wright, Elizabeth C. |
dc.contributor.author |
Eiriksdottir, Gudny |
dc.contributor.author |
Gudnason, Vilmundur |
dc.contributor.author |
Marinac, Catherine R. |
dc.contributor.author |
Davis, Megan |
dc.contributor.author |
Koster, Annemarie |
dc.contributor.author |
Caserotti, Paolo |
dc.contributor.author |
Sveinsson, Thorarinn |
dc.contributor.author |
Harris, Tamara |
dc.contributor.author |
Chen, Kong Y. |
dc.date.accessioned |
2021-05-12T01:00:46Z |
dc.date.available |
2021-05-12T01:00:46Z |
dc.date.issued |
2016-02-15 |
dc.identifier.citation |
Brychta , R J , Arnardottir , N Y , Johannsson , E , Wright , E C , Eiriksdottir , G , Gudnason , V , Marinac , C R , Davis , M , Koster , A , Caserotti , P , Sveinsson , T , Harris , T & Chen , K Y 2016 , ' Influence of day length and physical activity on sleep patterns in older Icelandic men and women ' , Journal of Clinical Sleep Medicine , vol. 12 , no. 2 , pp. 203-213 . https://doi.org/10.5664/jcsm.5486 |
dc.identifier.issn |
1550-9389 |
dc.identifier.other |
28120529 |
dc.identifier.other |
a7a3bda5-e200-4135-8c44-57d1e9b6b3f0 |
dc.identifier.other |
unpaywall: 10.5664/jcsm.5486 |
dc.identifier.other |
84959265308 |
dc.identifier.uri |
https://hdl.handle.net/20.500.11815/2583 |
dc.description.abstract |
Study Objectives: To identify cross-sectional and seasonal patterns of sleep and physical activity (PA) in community-dwelling, older Icelandic adults using accelerometers. Methods: A seven-day free-living protocol of 244 (110 female) adults aged 79.7 ± 4.9 years was conducted as part of a larger population-based longitudinal observational-cohort study in the greater Reykjavik area of Iceland. A subpopulation (n = 72) repeated the 7-day measurement during seasonal periods with greater (13.4 ± 1.4 h) and lesser (7.7 ± 1.8 h) daylight. Results: Cross-sectional analyses using multiple linear regression models revealed that day length was a significant independent predictor of sleep duration, mid-sleep, and rise time (all p < 0.05). However, the actual within-individual differences in sleep patterns of the repeaters were rather subtle between periods of longer and shorter day-lengths. Compared to women, men had a shorter sleep duration (462 ± 80 vs. 487 ± 68 minutes, p = 0.008), earlier rise time, and a greater number of awakenings per night (46.5 ± 18.3 vs. 40.2 ± 15.7, p = 0.007), but sleep efficiency and onset latency were similar between the two sexes. Daily PA was also similar between men and women and between periods of longer and shorter day-lengths. BMI, age, gender, and overall PA all contributed to the variations in sleep parameters using multiple regression analysis. Conclusions: The sleep and PA characteristics of this unique population revealed some gender differences, but there was limited variation in response to significant daylight changes which may be due to long-term adaptation. |
dc.format.extent |
11 |
dc.format.extent |
387743 |
dc.format.extent |
203-213 |
dc.language.iso |
en |
dc.relation.ispartofseries |
Journal of Clinical Sleep Medicine; 12(2) |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Svefn |
dc.subject |
Öldrun |
dc.subject |
Lífsgæði |
dc.subject |
Aging |
dc.subject |
Accelerometer |
dc.subject |
Physical activity |
dc.subject |
Sleep |
dc.subject |
Seasonal |
dc.title |
Influence of day length and physical activity on sleep patterns in older Icelandic men and women |
dc.type |
/dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article |
dc.description.version |
Peer reviewed |
dc.identifier.doi |
10.5664/jcsm.5486 |
dc.contributor.department |
Faculty of Nursing |
dc.contributor.department |
Faculty of Health Promotion, Sports and Leisure Studies |
dc.contributor.department |
Faculty of Medicine |