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Association of change in brain structure to objectively measured physical activity and sedentary behavior in older adults: Age, Gene/Environment Susceptibility-Reykjavik Study.

https://arctichealth.org/en/permalink/ahliterature266168
Source
Behav Brain Res. 2015 Sep 10;296:118-124
Publication Type
Article
Date
Sep-10-2015
Author
Nanna Yr Arnardottir
Annemarie Koster
Dane R Van Domelen
Robert J Brychta
Paolo Caserotti
Gudny Eiriksdottir
Johanna E Sverrisdottir
Sigurdur Sigurdsson
Erlingur Johannsson
Kong Y Chen
Vilmundur Gudnason
Tamara B Harris
Lenore J Launer
Thorarinn Sveinsson
Source
Behav Brain Res. 2015 Sep 10;296:118-124
Date
Sep-10-2015
Language
English
Publication Type
Article
Abstract
Many studies have examined the hypothesis that greater participation in physical activity (PA) is associated with less brain atrophy. Here we examine, in a sub-sample (n=352, mean age 79.1 years) of the Age, Gene/Environment Susceptibility-Reykjavik Study cohort, the association of the baseline and 5-year change in magnetic resonance imaging (MRI)-derived volumes of gray matter (GM) and white matter (WM) to active and sedentary behavior (SB) measured at the end of the 5-year period by a hip-worn accelerometer for seven consecutive days. More GM (ß=0.11; p=0.044) and WM (ß=0.11; p=0.030) at baseline was associated with more total physical activity (TPA). Also, when adjusting for baseline values, the 5-year change in GM (ß=0.14; p=0.0037) and WM (ß=0.11; p=0.030) was associated with TPA. The 5-year change in WM was associated with SB (ß=-0.11; p=0.0007). These data suggest that objectively measured PA and SB late in life are associated with current and prior cross-sectional measures of brain atrophy, and that change over time is associated with PA and SB in expected directions.
PubMed ID
26363425 View in PubMed
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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.

https://arctichealth.org/en/permalink/ahliterature290965
Source
Int J Environ Res Public Health. 2017 10 21; 14(10):
Publication Type
Journal Article
Research Support, Non-U.S. Gov't
Research Support, N.I.H., Extramural
Research Support, N.I.H., Intramural
Research Support, U.S. Gov't, Non-P.H.S.
Date
10-21-2017
Author
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
Author Affiliation
Faculty of Education, University of Akureyri, Nordurslod 2, 600 Akureyri, Iceland. nanna@unak.is.
Source
Int J Environ Res Public Health. 2017 10 21; 14(10):
Date
10-21-2017
Language
English
Publication Type
Journal Article
Research Support, Non-U.S. Gov't
Research Support, N.I.H., Extramural
Research Support, N.I.H., Intramural
Research Support, U.S. Gov't, Non-P.H.S.
Keywords
Accelerometry
Aged
Aged, 80 and over
Exercise
Female
Humans
Iceland
Independent Living - statistics & numerical data
Male
Seasons
Sedentary lifestyle
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 (ß = 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.
Notes
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PubMed ID
29065475 View in PubMed
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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.

https://arctichealth.org/en/permalink/ahliterature286647
Source
Int J Environ Res Public Health. 2017 Oct 21;14(10)
Publication Type
Article
Date
Oct-21-2017
Author
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
Source
Int J Environ Res Public Health. 2017 Oct 21;14(10)
Date
Oct-21-2017
Language
English
Publication Type
Article
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 (ß = 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.
PubMed ID
29065475 View in PubMed
Less detail

The use of digital photographs for the diagnosis of hand osteoarthritis: the AGES-Reykjavik study.

https://arctichealth.org/en/permalink/ahliterature126920
Source
BMC Musculoskelet Disord. 2012;13:20
Publication Type
Article
Date
2012
Author
Helgi Jonsson
Gudrun P Helgadottir
Thor Aspelund
Johanna E Sverrisdottir
Gudny Eiriksdottir
Sigurdur Sigurdsson
Gudmundur J Eliasson
Asbjorn Jonsson
Thorvaldur Ingvarsson
Tamara B Harris
Lenore Launer
Vilmundur Gudnason
Author Affiliation
Landspitalinn University Hospital, University of Iceland, IS-108 Fossvogur, Reykjavik, ICELAND. helgi@hi.is
Source
BMC Musculoskelet Disord. 2012;13:20
Date
2012
Language
English
Publication Type
Article
Keywords
Aged
Aged, 80 and over
Cohort Studies
Cross-Sectional Studies
Female
Hand - pathology - physiopathology - radiography
Hand Joints - pathology - physiopathology - radiography
Humans
Iceland
Male
Osteoarthritis - pathology - physiopathology - radiography
Photography - economics - methods - standards
Radiography - methods
Abstract
The objective of the study was to standardize a method using digital photographs to diagnose and grade hand osteoarthritis (HOA), to compare it with radiographs and clinical examination with regard to prevalence and relation to symptoms, and finally to construct a simple shortened version suitable for use in very large studies, where a global estimate may be preferable.
High quality photographs with standard distance and hand positioning were analysed for the presence of HOA and subsequently compared with standard radiographs and clinical examination in 381 random participants in the AGES-Reykjavik Study, a large population study. The mean age of the participants was 76 years.
Using the photographic method, the most commonly affected joints were the second DIP joints followed by the third DIP joints and second and third PIP joints. Both interobserver (ICC = 0.83) and intraobserver reading agreements (ICC = 0.89) were acceptable. On comparison with radiography and clinical examination, aggregate scores were significantly correlated (R(s) 0.35-0.69), more so in females (R(s) 0.53-0.72) than males. Hand pain in males showed very little association with HOA findings by the three methods but all methods showed a comparable moderate association with hand pain in females. The performance of photography in predicting pain on most days for at least a month in females was comparable to that of radiography and clinical examination (AUC 0.63 p = 0.004). Analysis of intermittent pain yielded similar results for in the DIP and PIP joints (OR 3.2-3.3, p
Notes
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PubMed ID
22340303 View in PubMed
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