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Related Experiment Video

Updated: Jan 24, 2026

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption
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Familial aggregation in physical activity.

P S Freedson1, S Evenson

  • 1Exercise Physiology Laboratory, University of Massachusetts.

Research Quarterly for Exercise and Sport
|December 1, 1991
PubMed
Summary
This summary is machine-generated.

This study validated the Caltrac accelerometer and activity record for measuring physical activity in children and adults. Results show familial resemblance in physical activity levels between parents and children.

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Area of Science:

  • Pediatrics
  • Sports Science
  • Human Movement

Background:

  • Accurate measurement of physical activity is crucial for understanding health behaviors.
  • The Caltrac accelerometer and Caltrac Activity Record (CAL REC) are tools used to assess physical activity.
  • Understanding familial patterns in physical activity can inform public health interventions.

Purpose of the Study:

  • To evaluate the stability and consistency of the Caltrac accelerometer and CAL REC in assessing physical activity in children and adults.
  • To investigate the relationship between parents' and children's physical activity levels.

Main Methods:

  • Thirty parent-child dyads (children aged 5-9 years) participated.
  • Participants wore Caltrac accelerometers for three consecutive days.
  • Parents completed the CAL REC for themselves and their child concurrently.

Main Results:

  • The Caltrac accelerometer demonstrated good between-day reliability for both parents (r = .73–.87) and children (r = .38–.79).
  • The CAL REC also showed acceptable between-day reliability for parents (r = .67–.91) and children (r = .36–.72).
  • Significant familial resemblance in physical activity was observed, with 66-73% of families showing similar activity patterns.

Conclusions:

  • The Caltrac accelerometer and CAL REC are reliable tools for assessing physical activity in children and adults.
  • Physical activity levels show a familial resemblance, suggesting a potential genetic or environmental influence.
  • These findings support the use of these tools in research and interventions targeting family physical activity.