PT  - JOURNAL ARTICLE
AU  - Zi Zhou
AU  - Jian Fu
AU  - Y. Alicia Hong
AU  - Ping Wang
AU  - Ya Fang
TI  - Association between exercise and the risk of dementia: results from a nationwide longitudinal study in China
AID  - 10.1136/bmjopen-2017-017497
DP  - 2017 Dec 01
TA  - BMJ Open
PG  - e017497
VI  - 7
IP  - 12
4099  - http://bmjopen.bmj.com/content/7/12/e017497.short
4100  - http://bmjopen.bmj.com/content/7/12/e017497.full
SO  - BMJ Open2017 Dec 01; 7
AB  - Objective This study was conducted to examine the causal association between exercise and the risk of dementia among older Chinese adults.Design Longitudinal population-based study with a follow-up duration of 9 years.Setting Data for the Chinese Longitudinal Healthy Longevity Survey waves occurring from 2002 to 2011–2012 were extracted from the survey database.Participants In total, 7501 dementia-free subjects who were older than 65 years were included at baseline. Dementia was defined as a self-reported or proxy-reported physician’s diagnosis of the disease.Outcome measures and methods Regular exercise and potential confounding variables were obtained via a self-report questionnaire. We generated longitudinal logistic regression models based on time-lagged generalised estimating equation to examine the causal association between exercise and dementia risk.Results Of the 7501 older Chinese people included in this study, 338 developed dementia during the 9-year follow-up period after excluding those who were lost to follow-up or deceased. People who regularly exercised had lower odds of developing dementia (OR=0.53, 95% CI 0.33 to 0.85) than those who did not exercise regularly.Conclusion Regular exercise was associated with decreased risk of dementia. Policy-makers should develop effective public health programmes and build exercise-friendly environments for the general public.