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J Phys Act Health. 2007 Oct;4(4):434-46.

Daily walking in older adults: day-to-day variability and criterion-referenced validity of total daily step counts.

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  • 1Department of Sport, Culture and the Arts, University of Strathclyde Jordanhill Campus, 76 Southbrae Drive, Glasgow, UK.

Abstract

OBJECTIVE:

To determine the day-to-day variability of older adults' physical activity, and to evaluate the accuracy of the 10,000-step goal for classifying whether older adults obtain 30 minutes of MVPA.

METHODS:

Ninety-one adults of age over 60 years of age wore a Yamax pedometer and Actigraph accelerometer for 7 days. Interday reliability was estimated via two-way ANOVA ICCs, and classification accuracy was evaluated via sensitivity, specificity, and ROC curve analysis.

RESULTS:

Interday reliability was high; 4 of 5 outcome measures had a reliability of > or = .80 with only 2 days of data. The 10,000-step cut point had high accuracy for identifying days with less than 30 minutes of MVPA, but poor accuracy for identifying days with more than 30 minutes of MVPA.

CONCLUSIONS:

Day-to-day variability in physical activity is lower in older adults than other age groups. The 10,000-step goal is inadequate for determining whether daily physical activity includes 30 minutes of MVPA in this population.

PMID:
18209234
[PubMed - indexed for MEDLINE]
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