Ability of the Caltrac accelerometer to assess daily physical activity levels

J Cardiopulm Rehabil. Mar-Apr 1995;15(2):107-13. doi: 10.1097/00008483-199503000-00003.

Abstract

Purpose: The purpose of this study was to determine the ability of the Caltrac accelerometer to assess habitual daily physical activity levels.

Methods: The ability of the Caltrac accelerometer to assess 24-hour physical activity (PA) levels was studied in 28 men and 50 women, age 20 to 59 years, with varying levels of self-reported PA. Twelve days of Caltrac readings obtained over 1 year's duration were compared to simultaneously recorded 48-hour PA records. Additionally, 28 days of Caltrac readings obtained over 1 year's duration were compared to mean values of the following validation measures assessed repeatedly over a 1-year period: a 4-week version of the Minnesota Leisure Time Physical Activity Questionnaire (FWH); VO2peak; and percent body fat.

Results: The Caltrac measurements of movement (in MET minutes per day-1) were significantly associated with the following: PA record indices of total (r = .51) and heavy (r = .34) and PA; FWH indices of total (r = .30), heavy R = .36) and moderate (r = .23) PA;, and VO2peak (r = .24). However, the Caltrac measurements of caloric PA record and FWH indices of PA, although there were directly associated with percent body fat (r = .50) and inversely associated with VO2peak (r = -.26).

Conclusions: Caltrac measurements of movement exhibited a moderate associated with several criterion measures related to habitual PA, whereas Caltrac measurements of total energy expenditure, were not reflective of varying levels of PA.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Activities of Daily Living*
  • Adult
  • Age Distribution
  • Anthropometry
  • Energy Metabolism / physiology
  • Female
  • Humans
  • Male
  • Middle Aged
  • Monitoring, Physiologic / instrumentation*
  • Physical Fitness* / physiology
  • Regression Analysis
  • Reproducibility of Results
  • Sex Distribution