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Int J Behav Nutr Phys Act. 2012 Apr 18;9:44. doi: 10.1186/1479-5868-9-44.

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

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  • 1Pennington Biomedical Research Center, Baton Rouge, LA, USA. Catrine.

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.

PMID:
22512833
[PubMed - indexed for MEDLINE]
PMCID:
PMC3475137
Free PMC Article
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