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Related Experiment Video

Updated: Apr 16, 2026

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
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Physical activity and adiposity markers at older ages: accelerometer vs questionnaire data.

Séverine Sabia1, Pol Cogranne2, Vincent T van Hees3

  • 1Department of Epidemiology and Public Health, University College London, London, United Kingdom; University Versailles St-Quentin, Boulogne-Billancourt, France.

Journal of the American Medical Directors Association
|March 11, 2015
PubMed
Summary

Accelerometer-measured physical activity shows a stronger link to lower adiposity in older adults than self-reported data. Objective physical activity assessment reveals greater benefits for successful aging and weight management.

Keywords:
Physical activityaccelerometeradipositybody mass indexquestionnairewaist circumference

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Area of Science:

  • Gerontology
  • Exercise Physiology
  • Obesity Research

Background:

  • Physical activity is vital for healthy aging.
  • Previous studies on physical activity and adiposity in older adults are limited by reliance on self-reported data.
  • Objective measures are needed to clarify the true impact of physical activity on body composition in later life.

Purpose of the Study:

  • To compare the associations of questionnaire-assessed versus accelerometer-assessed physical activity with adiposity markers in older adults.
  • To determine if objective physical activity measurement strengthens the observed relationship with body composition.
  • To provide a more accurate estimation of physical activity's role in managing adiposity during aging.

Main Methods:

  • Cross-sectional study of 3940 participants (aged 60-83 years) from the Whitehall II study.
  • Physical activity assessed via questionnaire and wrist-worn accelerometers over 9 days.
  • Adiposity markers included body mass index, waist circumference, and fat mass index.

Main Results:

  • Greater total physical activity, measured objectively, was dose-dependently associated with lower adiposity markers.
  • Accelerometer-assessed physical activity showed significantly stronger associations with adiposity than questionnaire data in both men and women.
  • Objective measurement of moderate-to-vigorous physical activity (MVPA) revealed continued benefits for reducing waist circumference at higher activity levels, unlike self-reported data.

Conclusions:

  • Objective assessment of physical activity, particularly using accelerometers, reveals a stronger inverse relationship with adiposity markers in older adults than previously estimated from self-report.
  • Physical activity may play a more critical role in adiposity management in older age than suggested by questionnaire-based studies.
  • These findings underscore the importance of objective physical activity measurement for understanding its impact on successful aging and health outcomes.