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Updated: Aug 15, 2025

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Physical activity changes during an automated online weight loss program.

Jessica A Emerson1, Leah M Schumacher1,2, Dale S Bond3

  • 1Weight Control and Diabetes Research Center, The Miriam Hospital, 196 Richmond St., Providence, RI, 02903, USA.

Journal of Behavioral Medicine
|January 5, 2023
PubMed
Summary
This summary is machine-generated.

Online behavioral weight loss (BWL) programs effectively reduce weight but show minimal improvements in moderate-to-vigorous physical activity. Greater increases in activity correlated with more significant weight loss, highlighting potential risks for long-term weight maintenance.

Keywords:
ObesityOnline treatmentPhysical activitySedentary behavior

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Area of Science:

  • Obesity research
  • Behavioral medicine
  • Exercise physiology

Background:

  • Online behavioral weight loss (BWL) programs integrate diet, physical activity, and behavioral strategies.
  • While BWL's impact on weight loss is established, its effects on physical activity levels are less understood.
  • Objective measurement of physical activity changes is crucial for evaluating BWL efficacy.

Purpose of the Study:

  • To investigate changes in objectively measured physical activity across the energy expenditure spectrum.
  • To assess the impact of a fully automated, online BWL program on physical activity.
  • To explore the relationship between physical activity changes and weight loss outcomes.

Main Methods:

  • A 12-week online BWL program was administered to adults with overweight or obesity (n=63).
  • Participants wore accelerometers for 7 days to objectively measure physical activity.
  • Body weight was measured in-clinic at pre- and post-treatment.

Main Results:

  • Mean daily moderate-to-vigorous physical activity increased by approximately 4 minutes (p=0.01).
  • No significant changes were observed in light physical activity or sedentary time (p>0.05).
  • Increased moderate-to-vigorous physical activity correlated with greater weight loss (r=-0.28, p=0.02), averaging 6.1% of baseline weight.

Conclusions:

  • Online BWL programs achieve significant weight loss but yield limited improvements in physical activity.
  • Clinically relevant increases in physical activity may not be consistently achieved through current online BWL interventions.
  • The insufficient enhancement of physical activity could pose a risk to long-term weight loss maintenance.