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Accelerometry cut points for physical activity in underserved African Americans.

Nevelyn N Trumpeter1, Hannah G Lawman, Dawn K Wilson

  • 1Department of Psychology, University of South Carolina, Barnwell College, Columbia, SC 29208, USA. neve.trumpeter@gmail.com

The International Journal of Behavioral Nutrition and Physical Activity
|June 16, 2012
PubMed
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This study validates accelerometry cut points for moderate physical activity (PA) in underserved African American adults. Findings suggest adjusted cut points are necessary for accurate PA measurement in this population.

Area of Science:

  • Exercise Physiology
  • Public Health
  • Biomedical Engineering

Background:

  • Limited research exists on accelerometry cut point validity for moderate physical activity (PA) in underserved minority populations.
  • High rates of chronic disease and physical inactivity in these groups may affect PA measurement accuracy.
  • Concerns exist that traditional PA cut points may overestimate activity levels in older or less active adults.

Purpose of the Study:

  • To determine the self-selected walking pace for "walk for exercise" in underserved African American adults.
  • To establish corresponding Actical accelerometry estimates (counts/minute) for various self-selected paces.
  • To validate and potentially adjust accelerometry cut points for moderate PA in this demographic.

Main Methods:

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  • Fifty-one underserved African American adults (mean age 60.1 years, mean BMI 30.5 kg/m²) participated.
  • Participants performed seated, standing, and three walking tasks: "strolling," "walking for exercise," and "walking in an emergency."
  • Actical accelerometers measured activity counts per minute during each task.

    • Main Results:

    • Average walking paces were: strolling (1.62 mph), walking for exercise (2.51 mph), and walking in an emergency (2.86 mph).
    • Corresponding Actical counts/minute were: strolling (4), walking for exercise (751), and walking in an emergency (2006).
    • Regression analysis predicted 1075 counts/minute for a 2.0 mph pace, a criterion for moderate exercise.

    Conclusions:

    • The derived cut point for moderate PA aligns with previous findings for older adults.
    • This study extends the application of adjusted accelerometry cut points to African American populations.
    • The methodology provides a means to obtain accurate PA cut points for diverse demographic groups.