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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
PubMed
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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.

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  • 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.