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Updated: Apr 26, 2026

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Accelerometer-based physical activity: total volume per day and standardized measures.

David R Bassett1, Richard P Troiano, James J McClain

  • 11Department of Kinesiology, Recreation, and Sport Studies, University of Tennessee, Knoxville, TN; and 2Division of Cancer Control and Population Sciences, National Cancer Institute, National Institutes of Health, Bethesda, MD.

Medicine and Science in Sports and Exercise
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Summary

Accelerometers now measure total physical activity (PA) volume using total activity counts per day (TAC/d). This metric, alongside others, offers a comprehensive view of health-related activity, improving research comparisons.

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Area of Science:

  • Exercise Science
  • Biomedical Engineering
  • Public Health

Background:

  • Accelerometers have become crucial in physical activity (PA) research over the last two decades.
  • Early devices estimated energy expenditure, while later focus shifted to moderate-to-vigorous PA (MVPA) bouts.
  • Recent evidence highlights health benefits of light-intensity and non-bout MVPA.

Observation:

  • The total volume of PA condenses frequency, intensity, and duration into a single, comparable metric.
  • Total activity counts per day (TAC/d) serves as a proxy for total PA volume in current research.
  • Percentiles for TAC/d have been established using National Health and Nutrition Examination Survey ActiGraph data.

Findings:

  • TAC/d offers a novel approach to assessing PA and can harmonize data across studies.
  • Standardized units of acceleration may also aid in PA data harmonization.
  • Machine learning is expected to enhance future activity recognition and energy expenditure estimations.

Implications:

  • TAC/d should complement, not replace, existing PA metrics like sedentary time and intensity-specific PA.
  • Future wearable monitor refinements should incorporate metrics reflecting total PA volume.
  • Standardized PA volume metrics can improve cross-study comparisons and public health insights.