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

• Published in: International Journal of Environmental Research and Public Health
• Main Authors: Nanna Yr Arnardottir, Nina Dora Oskarsdottir, Robert J. Brychta, Annemarie Koster, Dane R. van Domelen, Paolo Caserotti, Gudny Eiriksdottir, Johanna E. Sverrisdottir, Erlingur Johannsson, Lenore J. Launer, Vilmundur Gudnason, Tamara B. Harris, Kong Y. Chen, Thorarinn Sveinsson
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI AG 2017
• Subjects: seasonal; aging; physical activity; accelerometer; Medicine; R; Iceland
• Online Access: https://doi.org/10.3390/ijerph14101268; https://doaj.org/article/bc97b04d06214f56815295458df4bb0d

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.