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Estimating physical activity in youth using an ankle accelerometer.

Scott E Crouter1, Jennifer Flynn Oody2, David R Bassett1

  • 1a Department of Kinesiology, Recreation and Sport Studies , The University of Tennessee , Knoxville , TN , USA.

Journal of Sports Sciences
|March 9, 2018
PubMed
Summary
This summary is machine-generated.

A new two-regression model (2RM) using ankle-worn accelerometers accurately estimates physical activity energy expenditure in youth. This validated method offers a feasible approach for objective physical activity monitoring in children.

Keywords:
Motion sensoractivity counts variabilityadolescentschildrenenergy expenditure

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Area of Science:

  • Exercise Physiology
  • Biomedical Engineering
  • Pediatric Health

Background:

  • Objective physical activity assessment in youth is crucial for understanding health behaviors.
  • Previous accelerometer models often used wrist or hip placements, with limited validation for ankle placement.
  • Accurate measurement of energy expenditure and activity intensity is essential for pediatric research.

Purpose of the Study:

  • To develop and validate a vector magnitude (VM) two-regression model (2RM) for ankle-worn ActiGraph accelerometers in youth.
  • To assess the model's accuracy in estimating energy expenditure (METs) and time spent in different physical activity intensities.
  • To determine the feasibility of using an ankle placement for accelerometry in youth.

Main Methods:

  • Model development involved 181 youth during rest and structured activities.
  • Cross-validation used 42 youth during ~2 hours of unstructured physical activity (PA).
  • ActiGraph accelerometers (ankle) measured VM (counts/5-s); Cosmed K4b² measured energy expenditure (METs).
  • Thresholds for sedentary behavior (≤10 counts/5-s) and walking/running (CV≤15 counts/5-s) were established.

Main Results:

  • The ankle VM2RM demonstrated accuracy within 0.42 METy of measured values during unstructured PA (P > 0.05).
  • The model accurately estimated time in sedentary, light (LPA), moderate (MPA), and vigorous (VPA) PA, with differences within 5.7 minutes (P > 0.05).
  • Ankle VM2RM estimates closely matched measured values during free play.

Conclusions:

  • The validated ankle-worn VM2RM provides a feasible and accurate method for assessing physical activity and energy expenditure in youth.
  • Ankle accelerometry offers a viable alternative placement for objective PA monitoring in pediatric populations.
  • This model can enhance the understanding of physical activity patterns and their health implications in children and adolescents.