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Construct validity of a revised Physical Activity Scale and testing by cognitive interviewing.

Lise G Andersen1, Mogens Groenvold, Torben Jørgensen

  • 1Research Centre for Prevention and Health, Glostrup University Hospital, Glostrup, Denmark.

Scandinavian Journal of Public Health
|September 9, 2010
PubMed
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The new Physical Activity Scale (PAS 2) shows promise for accurately measuring weekly physical activity. It provides lower energy expenditure estimates than the previous scale, suggesting improved validity for physical activity assessment.

Area of Science:

  • Exercise Physiology
  • Public Health Research
  • Measurement Validation

Background:

  • Accurate measurement of physical activity is crucial for public health.
  • Existing physical activity scales may overestimate energy expenditure.
  • A new version, Physical Activity Scale 2 (PAS 2), was developed to address these limitations.

Purpose of the Study:

  • To validate the construct validity of the Physical Activity Scale 2 (PAS 2).
  • To assess the scale's ability to measure average weekly physical activity across sleep, work, and leisure domains.
  • To determine if further criterion validation of PAS 2 is warranted.

Main Methods:

  • Cognitive interviewing was used to evaluate response validity in 16 participants.
  • Construct validity was assessed in 342 participants by comparing PAS 2 MET-scores with a previous scale (PAS 1).

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  • Agreement between 24-hour MET-scores from PAS 1 and PAS 2 was analyzed.

    • Main Results:

    • Cognitive interviewing identified minimal issues with the PAS 2 questionnaire.
    • High agreement between PAS 1 and PAS 2 was observed for lower MET-scores (<45 MET-hours).
    • PAS 2 systematically underestimated MET-hours compared to PAS 1 at higher activity levels (≥45 MET-hours).

    Conclusions:

    • Minor revisions improved the validity of the PAS 2 scale.
    • PAS 2 yielded lower energy expenditure estimates than PAS 1, indicating potential for more accurate physical activity measurement.
    • Further validation of PAS 2 against objective criteria is recommended.