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Comparison of summer and winter objectively measured physical activity and sedentary behavior in older adults: Age, gene/environment susceptibility Reykjavik study

Comparison of summer and winter objectively measured physical activity and sedentary behavior in older adults: Age, gene/environment susceptibility Reykjavik study


Title: Comparison of summer and winter objectively measured physical activity and sedentary behavior in older adults: Age, gene/environment susceptibility Reykjavik study
Author: Arnardóttir, Nanna Ýr   orcid.org/0000-0003-1096-1449
Oskarsdottir, Nina Dora
Brychta, Robert J.
Koster, Annemarie
Van Domelen, Dane R.
Caserotti, Paolo
Eiriksdottir, Gudny   orcid.org/0000-0002-8197-0652
Sverrisdottir, Johanna E.
Johannsson, Erlingur
Launer, Lenore J.
... 4 more authors Show all authors
Date: 2017-10-21
Language: English
Scope:
Department: Faculty of Education
Faculty of Health Promotion, Sports and Leisure Studies
Faculty of Medicine
Series: International Journal of Environmental Research and Public Health; 14(10)
ISSN: 1661-7827
DOI: https://doi.org/10.3390/ijerph14101268
Subject: Árstíðir; Öldrun; Hreyfing (heilsurækt); Seasonal; Aging; Physical activity; Accelerometer; Seasonal; Aging; Physical activity; Accelerometer; Public Health, Environmental and Occupational Health; Health, Toxicology and Mutagenesis
URI: https://hdl.handle.net/20.500.11815/2974

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Citation:

Arnardóttir , N Ý , Oskarsdottir , N D , Brychta , R J , Koster , A , Van Domelen , D R , Caserotti , P , Eiriksdottir , G , Sverrisdottir , J E , Johannsson , E , Launer , L J , Guðnason , V G , Harris , T B , Chen , K Y & Sveinsson , Þ 2017 , ' Comparison of summer and winter objectively measured physical activity and sedentary behavior in older adults: Age, gene/environment susceptibility Reykjavik study ' , International Journal of Environmental Research and Public Health , vol. 14 , no. 10 , 1268 . https://doi.org/10.3390/ijerph14101268

Abstract:

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.

Description:

Funding Information: Acknowledgments: This study has been funded by NIA contract N01-AG-1-2100, the NIA Intramural Research Program, Hjartavernd (the Icelandic Heart Association), and the Althingi (the Icelandic Parliament). This work was also supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-0940903 and by the National Institutes of Health Intramural Research Program, grant number: Z01 DK071013 and Z01 DK071014 to Robert J. Brychta and Kong Y. Chen. The researchers are indebted to the participants for their willingness to participate in the study. Funding Information: To improve the sensitivity of detecting differences between seasons, we carried out a within-individual nested study We asked two hundred and nineteen (219) subjects who had worn an accelerometer during the “summer” months with more hours of daylight (from 15 May to 30 September 2009) to wear the monitor again for a week during the “winter” months with fewer daylight hours (from 18 November 2009 to 19 March 2010). 160 subjects accepted participation, and three device malfunctions led to 157 participants with usable accelerometer data, 138 of which had four or more valid days of measurements in both winter and summer sessions and were used for the final primary analysis. The summer-winter sub-group was found to reflect the total participants measured in the original accelerometry study. No measurements were done in July 2009 because of summer vacations and in late December 2009 because of Christmas. The study was approved by the Icelandic National Bioethics Committee (VSN: 00-063), the Icelandic Data Protection Authority, and the institutional review board of the U.S. National Institute on Aging, National Institutes of Health. Signed informed consent was given by all participants. Publisher Copyright: © 2017 by the authors. Licensee MDPI, Basel, Switzerland.

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