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Measuring physical activity with the behavioral risk factor surveillance system
R C Brownson1, D A Jones, M Pratt
1Department of Community Health and Prevention Research Center, School of Public Health, Saint Louis University, MO 63108-3342, USA. brownson@slu.edu
Medicine and Science in Sports and Exercise
|November 18, 2000
Summary
Regular physical activity is crucial for health. The study found that only 20% of US adults met physical activity guidelines, highlighting a need for standardized measurement and improved public health strategies.
Area of Science:
- Public Health
- Epidemiology
- Behavioral Science
Background:
- Accurate measurement of physical activity is vital for public health surveillance.
- The Behavioral Risk Factor Surveillance System (BRFSS) is a key tool for population-based health monitoring.
- Understanding physical activity patterns informs public health interventions and policy.
Purpose of the Study:
- To review and compare methods for measuring physical activity using BRFSS data.
- To describe national physical activity patterns in the United States.
- To provide recommendations for future research and practice in physical activity surveillance.
Main Methods:
- Analysis of 1996 BRFSS data from 124,085 noninstitutionalized adults aged 18+.
- Development of eight physical activity indices (one vigorous, seven moderate) based on duration, kcal expenditure, frequency, and intensity.
- Data collected via random-digit dialing telephone surveys.
Main Results:
- Population prevalence of moderate physical activity varied from 20% to 38% depending on the algorithm used.
- Only 20% of adults met the Healthy People 2000 definition of regular physical activity (≥30 min/day, ≥5 days/week).
Conclusions:
- Significant improvement is required for the US to achieve its physical activity goals.
- Standardized methods for collecting and analyzing physical activity data are essential for effective public health surveillance and policy.
- Clear communication strategies are needed to promote physical activity to the public.
