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Related Experiment Video

Updated: May 30, 2026

Physical Activity Measurement in Children Accepting Table Tennis Training
06:51

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Published on: July 27, 2022

Can we modulate physical activity in children? No.

T J Wilkin1

  • 1Department Endocrinology and Metabolism, University Medicine, Peninsula Medical School, Plymouth, UK. t.wilkin@pms.ac.uk

International Journal of Obesity (2005)
|August 11, 2011
PubMed
Summary
This summary is machine-generated.

Childhood obesity interventions may fail because children’s physical activity levels are centrally controlled by an ‘activitystat’ feedback loop, resisting long-term changes. Temporary increases in activity are likely perturbations, not true modulations of the set point.

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Area of Science:

  • Pediatric Endocrinology
  • Behavioral Physiology
  • Obesity Research

Background:

  • Physical activity is intuitively linked to weight reduction in obese children.
  • However, evidence suggests sustained increases in physical activity are challenging to achieve.
  • An 'activitystat' feedback mechanism may regulate children's physical activity levels.

Purpose of the Study:

  • To review feedback control principles applied to physical activity.
  • To discuss evidence for central control of physical activity in children.
  • To propose how a physical activity control loop defends its set point.

Main Methods:

  • Review of feedback control principles.
  • Analysis of evidence for central regulation of physical activity.
  • Examination of systematic variations in children's activity patterns.

Main Results:

  • Objective measurements indicate children's physical activity varies systematically, not randomly.
  • Activity levels show little variation across different environments, times, or places.
  • Children appear to compensate for activity levels at different times of day.

Conclusions:

  • Children's physical activity is centrally controlled by the child, not the environment.
  • Short-term activity changes during interventions may be perturbations, not modulations.
  • There is limited evidence that interventions lead to long-term increases in children's physical activity.