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Does regular exercise protect against air pollution-associated mortality?
Chit-Ming Wong1, Chun-Quan Ou, Thuan-Quoc Thach
1Department of Community Medicine, School of Public Health, The University of Hong Kong, 5th Floor, Faculty of Medicine Building, 21 Sassoon Road, Pokfulam, Hong Kong, China.
Preventive Medicine
|February 13, 2007
Summary
Regular exercise may protect against premature death from air pollution. This study found higher mortality risks linked to air pollutants in non-exercisers compared to those who exercise habitually.
Area of Science:
- Environmental Health
- Epidemiology
- Public Health
Background:
- Air pollution poses a significant threat to public health, contributing to increased mortality.
- The role of lifestyle factors, such as habitual exercise, in mitigating the health impacts of air pollution requires further investigation.
Purpose of the Study:
- To investigate whether habitual exercise modifies the association between exposure to air pollution and mortality risk.
- To quantify the differential impact of air pollutants on mortality among individuals with and without a regular exercise routine.
Main Methods:
- A cohort of 24,053 Hong Kong Chinese adults aged 30 years and older who died in 1998 was analyzed.
- Participants were categorized into 'never-exercise' and 'exercise' groups based on self-reported frequency.
- Poisson regression models estimated excess risks (ER) of mortality per 10 microg/m(3) increase in air pollutants, with interaction models assessing differences between groups.
Main Results:
- In individuals aged 65 and older, the 'never-exercise' group showed significant excess risks for mortality from natural causes linked to nitrogen dioxide, ozone, and fine particulate matter.
- Compared to the 'exercise' group, the 'never-exercise' group had significantly higher excess risks for these pollutants, ranging from 1.75% to 4.31%.
- These findings remained robust after adjusting for socioeconomic status, smoking, and health status, and demonstrated non-linear effects across different exercise levels.
Conclusions:
- Habitual exercise appears to confer a protective effect against premature mortality associated with exposure to common air pollutants.
- Promoting regular physical activity may be a viable public health strategy to reduce the adverse health consequences of air pollution.
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