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Main and interacting effects of physical activity and sedentary time on older adults' BMI: The moderating roles of socio-demographic and environmental attributes

(2020) PLOS ONE. 15(7).
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Abstract
Objectives Our first aim was to examine the main and interacting effects of accelerometer-based sedentary time (ST) and moderate-to-vigorous physical activity (MVPA) with BMI and the likelihood of being overweight/obese in Hong Kong and Ghent (Belgium) older adults. Second, we examined whether these main associations and interactions between MVPA and ST were moderated by socio-demographics (gender, education) and objective neighbourhood attributes supposed to be associated with healthy food intake (food outlet density, neighbourhood-level SES). Finally, we determined whether the associations and interactions were generalisable across study sites. Methods Data from the ALECS (Hong Kong) and BEPAS Seniors studies (Ghent), two comparable observational studies, were used. Older adults (n = 829, 65+) provided self-reported socio-demographic information and objective MVPA and ST data using Actigraph accelerometers. Annual household income data and GIS software were used to assess neighbourhood-level SES and food outlet density. Generalised additive mixed models were conducted in R. Results ST was linearly and positively related to both weight outcomes in the overall sample, while MVPA was not. The overall-sample analyses including the two-way interaction between MVPA and ST showed no interactions between these behaviours on weight outcomes. Three site-specific findings were identified, showing distinct associations in Hong Kong compared to Ghent. Study site moderated the interaction between ST and MVPA on both weight outcomes, the interaction between education and ST on both weight outcomes and the interaction between the number of food outlets and ST on being overweight/obese. Conclusions The country-specific effects confirm the cultural dependency and complexity of the associations between PA, ST and weight outcomes. Future longitudinal international studies including older adults from multiple regions assessing PA, ST, weight outcomes and dietary intake should be encouraged. Such studies are needed to refine the recommendations regarding ST and PA in older adults in light of preventing overweight and obesity.
Keywords
BODY-MASS INDEX, CARDIO-METABOLIC RISK, NEIGHBORHOOD CHARACTERISTICS, ABDOMINAL OBESITY, ASSOCIATIONS, BEHAVIOR, OVERWEIGHT/OBESITY, PREVALENCE

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MLA
Van Dyck, Delfien, et al. “Main and Interacting Effects of Physical Activity and Sedentary Time on Older Adults’ BMI: The Moderating Roles of Socio-Demographic and Environmental Attributes.” PLOS ONE, vol. 15, no. 7, Public Library Science, 2020, doi:10.1371/journal.pone.0235833.
APA
Van Dyck, D., Barnett, A., Van Cauwenberg, J., Zhang, C. J. P., Sit, C. H. P., & Cerin, E. (2020). Main and interacting effects of physical activity and sedentary time on older adults’ BMI: The moderating roles of socio-demographic and environmental attributes. PLOS ONE, 15(7). https://doi.org/10.1371/journal.pone.0235833
Chicago author-date
Van Dyck, Delfien, Anthony Barnett, Jelle Van Cauwenberg, Casper J. P. Zhang, Cindy H. P. Sit, and Ester Cerin. 2020. “Main and Interacting Effects of Physical Activity and Sedentary Time on Older Adults’ BMI: The Moderating Roles of Socio-Demographic and Environmental Attributes.” PLOS ONE 15 (7). https://doi.org/10.1371/journal.pone.0235833.
Chicago author-date (all authors)
Van Dyck, Delfien, Anthony Barnett, Jelle Van Cauwenberg, Casper J. P. Zhang, Cindy H. P. Sit, and Ester Cerin. 2020. “Main and Interacting Effects of Physical Activity and Sedentary Time on Older Adults’ BMI: The Moderating Roles of Socio-Demographic and Environmental Attributes.” PLOS ONE 15 (7). doi:10.1371/journal.pone.0235833.
Vancouver
1.
Van Dyck D, Barnett A, Van Cauwenberg J, Zhang CJP, Sit CHP, Cerin E. Main and interacting effects of physical activity and sedentary time on older adults’ BMI: The moderating roles of socio-demographic and environmental attributes. PLOS ONE. 2020;15(7).
IEEE
[1]
D. Van Dyck, A. Barnett, J. Van Cauwenberg, C. J. P. Zhang, C. H. P. Sit, and E. Cerin, “Main and interacting effects of physical activity and sedentary time on older adults’ BMI: The moderating roles of socio-demographic and environmental attributes,” PLOS ONE, vol. 15, no. 7, 2020.
@article{8672314,
  abstract     = {{Objectives Our first aim was to examine the main and interacting effects of accelerometer-based sedentary time (ST) and moderate-to-vigorous physical activity (MVPA) with BMI and the likelihood of being overweight/obese in Hong Kong and Ghent (Belgium) older adults. Second, we examined whether these main associations and interactions between MVPA and ST were moderated by socio-demographics (gender, education) and objective neighbourhood attributes supposed to be associated with healthy food intake (food outlet density, neighbourhood-level SES). Finally, we determined whether the associations and interactions were generalisable across study sites. Methods Data from the ALECS (Hong Kong) and BEPAS Seniors studies (Ghent), two comparable observational studies, were used. Older adults (n = 829, 65+) provided self-reported socio-demographic information and objective MVPA and ST data using Actigraph accelerometers. Annual household income data and GIS software were used to assess neighbourhood-level SES and food outlet density. Generalised additive mixed models were conducted in R. Results ST was linearly and positively related to both weight outcomes in the overall sample, while MVPA was not. The overall-sample analyses including the two-way interaction between MVPA and ST showed no interactions between these behaviours on weight outcomes. Three site-specific findings were identified, showing distinct associations in Hong Kong compared to Ghent. Study site moderated the interaction between ST and MVPA on both weight outcomes, the interaction between education and ST on both weight outcomes and the interaction between the number of food outlets and ST on being overweight/obese. Conclusions The country-specific effects confirm the cultural dependency and complexity of the associations between PA, ST and weight outcomes. Future longitudinal international studies including older adults from multiple regions assessing PA, ST, weight outcomes and dietary intake should be encouraged. Such studies are needed to refine the recommendations regarding ST and PA in older adults in light of preventing overweight and obesity.}},
  articleno    = {{e0235833}},
  author       = {{Van Dyck, Delfien and Barnett, Anthony and Van Cauwenberg, Jelle and Zhang, Casper J. P. and Sit, Cindy H. P. and Cerin, Ester}},
  issn         = {{1932-6203}},
  journal      = {{PLOS ONE}},
  keywords     = {{BODY-MASS INDEX,CARDIO-METABOLIC RISK,NEIGHBORHOOD CHARACTERISTICS,ABDOMINAL OBESITY,ASSOCIATIONS,BEHAVIOR,OVERWEIGHT/OBESITY,PREVALENCE}},
  language     = {{eng}},
  number       = {{7}},
  pages        = {{15}},
  publisher    = {{Public Library Science}},
  title        = {{Main and interacting effects of physical activity and sedentary time on older adults' BMI: The moderating roles of socio-demographic and environmental attributes}},
  url          = {{http://dx.doi.org/10.1371/journal.pone.0235833}},
  volume       = {{15}},
  year         = {{2020}},
}

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