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Self-reported physical activity compared with maximal oxygen uptake.

S F Siconolfi, T M Lasater, R C Snow

    American Journal of Epidemiology
    |July 1, 1985
    PubMed
    Summary
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    A simple question about inducing sweat accurately estimates physical fitness. This low-cost method is more effective than detailed questionnaires for assessing cardiorespiratory fitness in large groups.

    Area of Science:

    • Exercise Physiology
    • Public Health

    Background:

    • Maximal oxygen uptake (VO2 max) is a key indicator of physical fitness.
    • Traditional methods for measuring or estimating VO2 max are complex, costly, and carry risks.
    • There is a need for simpler, more accessible fitness assessment methods.

    Purpose of the Study:

    • To compare the validity of the Paffenbarger Physical Activity Index (PAI) with a simple "sweat" question for estimating maximal oxygen uptake.
    • To determine if a single question about sweat-inducing physical activity frequency can serve as a proxy for fitness.

    Main Methods:

    • 36 men and 32 women completed the Paffenbarger PAI and a question about sweat-inducing physical activity frequency.
    • Maximal oxygen uptake was measured using pedal ergometry.
    • Correlations and regression analyses were performed to compare the validity of the two assessment methods.

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    Main Results:

    • The "sweat" question showed moderate correlations with maximal oxygen uptake (0.54 males, 0.46 total group).
    • The Paffenbarger PAI showed weaker correlations (0.26 males, 0.29 total group).
    • A significant regression model was established: VO2 max = 1.92 x (sweat days) + 23.76.

    Conclusions:

    • A simple "sweat" question is a more valid and simpler method for estimating physical fitness than the Paffenbarger PAI.
    • This approach offers a low-cost, risk-free, and rapid method for fitness assessment in epidemiologic studies.