Pedometer determined physical activity tracks in African American adults: The Jackson Heart Study

Robert L. Newton, Hongmei H. M, Patricia M. Dubbert, William D. Johnson, DeMarc A. Hickson, Barbara Ainsworth, Teresa Carithers, Herman Taylor, Sharon Wyatt, Catrine Tudor-Locke

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3 Scopus citations

Abstract

Background: This study investigated the number of pedometer assessment occasions required to establish habitual physical activity in African American adults.Methods: African American adults (mean age 59.9 ± 0.60 years; 59 % female) enrolled in the Diet and Physical Activity Substudy of the Jackson Heart Study wore Yamax pedometers during 3-day monitoring periods, assessed on two to three distinct occasions, each separated by approximately one month. The stability of pedometer measured PA was described as differences in mean steps/day across time, as intraclass correlation coefficients (ICC) by sex, age, and body mass index (BMI) category, and as percent of participants changing steps/day quartiles across time.Results: Valid data were obtained for 270 participants on either two or three different assessment occasions. Mean steps/day were not significantly different across assessment occasions (p values > 0.456). The overall ICCs for steps/day assessed on either two or three occasions were 0.57 and 0.76, respectively. In addition, 85 % (two assessment occasions) and 76 % (three assessment occasions) of all participants remained in the same steps/day quartile or changed one quartile over time.Conclusion: The current study shows that an overall mean steps/day estimate based on a 3-day monitoring period did not differ significantly over 4 - 6 months. The findings were robust to differences in sex, age, and BMI categories. A single 3-day monitoring period is sufficient to capture habitual physical activity in African American adults.

Original languageEnglish (US)
Article number44
JournalInternational Journal of Behavioral Nutrition and Physical Activity
Volume9
DOIs
Publication statusPublished - Apr 18 2012

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Keywords

  • African Americans
  • Physical activity assessment
  • Sedentary
  • Validity

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics
  • Physical Therapy, Sports Therapy and Rehabilitation

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