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The purpose of this study was to examine the validity of a computerized 24-hour physical activity recall instrument (24PAR).
Participants (n = 20) wore 2 pattern-recognition activity monitors (an IDEEA and a SenseWear Pro Armband) for a 24-hour period and then completed the 24PAR the following morning. Participants completed 2 trials, 1 while maintaining a prospective diary of their activities and 1 without a diary. The trials were counterbalanced and completed within a week from each other. Estimates of energy expenditure (EE) and minutes of moderate-to-vigorous physical activity (MVPA) were compared with the criterion measures using 3-way (method by gender by trial) mixed-model ANOVA analyses.
For EE, pairwise correlations were high (r > .88), and there were no differences in estimates across methods. Estimates of MVPA were more variable, but correlations were still in the moderate to high range (r > .57). Average activity levels were significantly higher on the logging trial, but there was no significant difference in the accuracy of self-report on days with and without logging.
The results of this study support the overall utility of the 24PAR for group-level estimates of daily EE and MVPA.
Calabro and Welk are with the Dept of Kinesiology, and Car-riquiry, Nusser, Beyler the Dept of Statistics, Iowa State University, Ames, IA 50011. Matthews is with the Dept of Medicine, Vanderbilt University, Nashville, TN 37232.