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Related Experiment Video

Updated: May 28, 2026

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
05:59

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity

Published on: March 7, 2019

Reactivity in baseline accelerometer data from a physical activity behavioral intervention.

Robert W Motl1, Edward McAuley, Deirdre Dlugonski

  • 1Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. robmotl@illinois.edu

Health Psychology : Official Journal of the Division of Health Psychology, American Psychological Association
|October 26, 2011
PubMed
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Baseline physical activity assessments using accelerometry may show reactivity in persons with multiple sclerosis (MS). This reactivity, a significant increase in steps per day during the first week of intervention, was observed in two separate studies.

Area of Science:

  • Rehabilitation science
  • Clinical research
  • Biomedical engineering

Background:

  • Behavioral interventions aim to increase physical activity in persons with multiple sclerosis (MS).
  • Objective assessment of physical activity is crucial for evaluating intervention effectiveness.
  • Accelerometry is a common tool for measuring physical activity.

Purpose of the Study:

  • To investigate the phenomenon of reactivity during baseline physical activity assessment in individuals with MS.
  • To examine if accelerometry-based baseline measurements are influenced by the subsequent intervention week.

Main Methods:

  • Two randomized controlled trials involving participants with MS were analyzed.
  • Participants (Study 1: n=18, Study 2: n=20) wore accelerometers for 7-day baseline data collection.

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Related Experiment Videos

Last Updated: May 28, 2026

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
05:59

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity

Published on: March 7, 2019

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption
08:45

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption

Published on: June 20, 2025

A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
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  • Physical activity was measured as average steps per day over 7-day periods.

    • Main Results:

    • Study 1 showed a statistically significant increase of 1,822 steps/day (d = 0.56, p = 0.03) between baseline and week 1.
    • Study 2 demonstrated a larger significant increase of 2,338 steps/day (d = 1.36, p = 0.0001) between baseline and week 1.
    • These findings indicate a notable change in physical activity shortly after the intervention began.

    Conclusions:

    • A significant increase in physical activity was observed between baseline and the first week of intervention in both studies.
    • This change is hypothesized to represent reactivity in the baseline assessment using accelerometry.
    • Further research is needed to understand and account for this reactivity in intervention studies.