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Physical inactivity, excess adiposity and premature mortality
P T Katzmarzyk1, I Janssen, C I Ardern
1School of Physical and Health Education, Queen's University, Kingston, ON, Canada. katzmarz@post.queensu.ca
Summary
Physical inactivity and excess adiposity increase mortality risk. Regular physical activity lowers mortality risk, independent of body fat levels. Both factors are significant determinants of mortality.
Area of Science:
- Public Health
- Epidemiology
- Preventive Medicine
Background:
- Physical inactivity and excess adiposity are recognized as major public health concerns.
- Their independent and combined contributions to all-cause mortality require precise elucidation.
Purpose of the Study:
- To review evidence linking physical inactivity and excess adiposity to all-cause mortality.
- To determine the independent impact of each factor on mortality rates.
Main Methods:
- A variance-based meta-analysis synthesized data from multiple studies.
- Relative risks for all-cause mortality were calculated, adjusting for adiposity and physical activity covariates.
Main Results:
- Physically active individuals exhibited a lower risk of all-cause mortality (RR 0.80) compared to inactive individuals, irrespective of adiposity.
- Elevated body mass index (BMI) was associated with increased all-cause mortality risk (RR 1.23), independent of physical activity levels.
- Stratified analyses confirmed that both physical inactivity and adiposity are significant determinants of mortality risk.
Conclusions:
- Physical activity offers mortality benefits independent of adiposity.
- Adiposity also independently contributes to increased mortality risk.
- Combined, physical inactivity and adiposity represent critical targets for public health interventions to reduce all-cause mortality.