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Related Experiment Videos

Intraindividual variability and reliability in a 7-day exercise record.

T Baranowski1, M Smith, W O Thompson

  • 1Rollins School of Public Health of Emory University, Atlanta, GA, USA. tbaranow@notes.mdacc.tmc.edu@internet

Medicine and Science in Sports and Exercise
|December 10, 1999
PubMed
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Assessing physical activity requires careful attention to reliability. Two weeks of data collection are needed to achieve a reliability of 0.8 for a 7-day physical activity record.

Area of Science:

  • Epidemiology
  • Biostatistics
  • Physical Activity Research

Background:

  • High day-to-day variability in physical activity measures reduces reliability.
  • Unreliable measures attenuate correlations with other variables.
  • Increased variability necessitates more assessment days for reliable physical activity measurement.

Purpose of the Study:

  • To investigate the impact of intraindividual variability on physical activity measurement reliability.
  • To determine the number of assessment days required to achieve a desired reliability level.
  • To evaluate the assumption of compound symmetry in assessing day-to-day physical activity reliability.

Main Methods:

  • A 3-year study involving 165 elementary school teachers recording physical activity daily.

Related Experiment Videos

  • Physical activity analyzed in minutes, MET minutes, and kcal.
  • PROC MIXED in SAS used to control for school clustering effects.

    • Main Results:

    • Compound symmetry assumption was not supported across a 7-day record.
    • Weekdays showed intercorrelation, while weekends (Saturday and Sunday) had low correlations.
    • Compound symmetry was supported across three weeks of assessment.

    Conclusions:

    • Achieving a reliability of 0.8 for a 7-day physical activity record requires 2 weeks of assessment.
    • Reliability of physical activity measures needs careful consideration.
    • Increased assessment points are likely necessary to attain desired reliability levels.