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Int. J. Environ. Res. Public Health 2017, 14(10), 1268; doi:10.3390/ijerph14101268

Comparison of Summer and Winter Objectively Measured Physical Activity and Sedentary Behavior in Older Adults: Age, Gene/Environment Susceptibility Reykjavik Study

Faculty of Education, University of Akureyri, Nordurslod 2, 600 Akureyri, Iceland
Icelandic Heart Association, Holtasmári 1, 201 Kópavogur, Iceland
Research Center of Movement Science, University of Iceland, Stapi v/Hringbraut, 101 Reykjavík, Iceland
National Institute of Diabetes and Digestive and Kidney Diseases, Diabetes, Endocrinology, and Obesity Branch, Bethesda, MD 20892, USA
CAPHRI Care and Public Health Research Institute, Department of Social Medicine, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands
Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA
Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, 5230 Odense M, Denmark
Center for Sport and Health Sciences, University of Iceland, Saemundargata 2, 101 Reykjavik, Iceland
Department of Sport and Physical Activity, Western Norway University of Applied Science, Bergen 5063, Norway
Laboratory of Epidemiology and Population Sciences, National Institute on Aging, Bethesda, MD 20892, USA
Faculty of Medicine, School of Health Sciences, University of Iceland, Saemundargata 2, 101 Reykjavik, Iceland
Author to whom correspondence should be addressed.
Received: 11 September 2017 / Revised: 12 October 2017 / Accepted: 18 October 2017 / Published: 21 October 2017
(This article belongs to the Special Issue Interventions for Healthy Aging)
View Full-Text   |   Download PDF [323 KB, uploaded 22 October 2017]


In Iceland, there is a large variation in daylight between summer and winter. The aim of the study was to identify how this large variation influences physical activity (PA) and sedentary behavior (SB). Free living PA was measured by a waist-worn accelerometer for one week during waking hours in 138 community-dwelling older adults (61.1% women, 80.3 ± 4.9 years) during summer and winter months. In general, SB occupied about 75% of the registered wear-time and was highly correlated with age (β = 0.36). Although the differences were small, more time was spent during the summer in all PA categories, except for the moderate-to-vigorous PA (MVPA), and SB was reduced. More lifestyle PA (LSPA) was accumulated in ≥5-min bouts during summer than winter, especially among highly active participants. This information could be important for policy makers and health professionals working with older adults. Accounting for seasonal difference is necessary in analyzing SB and PA data. View Full-Text
Keywords: seasonal; aging; physical activity; accelerometer seasonal; aging; physical activity; accelerometer
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Arnardottir, N.Y.; Oskarsdottir, N.D.; Brychta, R.J.; Koster, A.; van Domelen, D.R.; Caserotti, P.; Eiriksdottir, G.; Sverrisdottir, J.E.; Johannsson, E.; Launer, L.J.; Gudnason, V.; Harris, T.B.; Chen, K.Y.; Sveinsson, T. Comparison of Summer and Winter Objectively Measured Physical Activity and Sedentary Behavior in Older Adults: Age, Gene/Environment Susceptibility Reykjavik Study. Int. J. Environ. Res. Public Health 2017, 14, 1268.

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