European Journal of Epidemiology

, Volume 28, Issue 3, pp 277–283 | Cite as

The association between physical activity and dementia in an elderly population: the Rotterdam Study

  • Renée F. A. G. de Bruijn
  • Elisabeth M. C. Schrijvers
  • Karen A. de Groot
  • Jacqueline C. M. Witteman
  • Albert Hofman
  • Oscar H. Franco
  • Peter J. Koudstaal
  • Mohammad Arfan Ikram
NEURO-EPIDEMIOLOGY

Abstract

Several studies have associated physical activity with the risk of dementia, but mostly did so during short follow-up. It remains unclear whether physical activity also affects dementia during longer follow-up. We examined the association between physical activity and risk of dementia during a follow-up period up to 14 years. From 1997 to 1999, physical activity was assessed using a validated questionnaire in 4,406 elderly persons (age range 61–97) from the prospective, population-based Rotterdam Study. Follow-up for dementia was complete until January 1, 2011. We used Cox proportional hazards models to assess the association between physical activity and incident dementia. Next, we stratified follow-up time using a cut-off of 4 years. We separately investigated dementia due to Alzheimer disease. During 38,631 person-years, 583 participants developed dementia. When adjusting for age and sex, we found a borderline significant association between higher physical activity and lower risk of dementia (HR 0.95; 95 % CI 0.87–1.04). This association was confined to follow-up up to 4 years (HR 0.82; 95 % CI 0.71–0.95), and not to follow-up of at least 4 years (HR 1.04; 95 % CI 0.93–1.16). Additional adjustments only slightly attenuated the associations. A similar pattern was present for Alzheimer disease. We found a higher level of physical activity to be associated with a lower risk of dementia. This association was confined to follow-up for up to 4 years and not to longer follow-up, suggesting either a role for reverse causality or only a short term effect of late-life physical activity in an elderly population.

Keywords

Risk factors Physical activity Dementia Alzheimer disease 

Notes

Acknowledgments

The Rotterdam Study is sponsored by the Erasmus Medical Center and Erasmus University Rotterdam, The Netherlands Organization for Scientific Research (I), The Netherlands Organization for Health Research and Development (ZonMW), the Research Institute for Diseases in the Elderly (RIDE), The Netherlands Genomics Initiative, the Ministry of Education, Culture and Science, the Ministry of Health, Welfare and Sports, the European Commission (DG XII), and the Municipality of Rotterdam. Further support was obtained from the Netherlands Consortium for Healthy Ageing.

Conflict of interest

No funding has been received for the preparation of this manuscript. There are no conflicts of interest or commercial affiliations of any of the authors.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Renée F. A. G. de Bruijn
    • 1
    • 2
    • 4
  • Elisabeth M. C. Schrijvers
    • 1
  • Karen A. de Groot
    • 1
  • Jacqueline C. M. Witteman
    • 1
  • Albert Hofman
    • 1
  • Oscar H. Franco
    • 1
  • Peter J. Koudstaal
    • 2
  • Mohammad Arfan Ikram
    • 1
    • 2
    • 3
    • 4
  1. 1.Department of EpidemiologyErasmus MC University Medical CenterRotterdamThe Netherlands
  2. 2.Department of NeurologyErasmus MC University Medical CenterRotterdamThe Netherlands
  3. 3.Department of RadiologyErasmus MC University Medical CenterRotterdamThe Netherlands
  4. 4.Netherlands Consortium for Healthy AgeingLeidenThe Netherlands

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