Published in:
13-11-2021 | Original Article
Physical activity assessment in African Americans participating in a dietary weight-loss trial focused on soul food
Authors:
John A. Bernhart, Gabrielle M. Turner-McGrievy, Sarah Eustis, Mary J. Wilson, Brent Hutto, Sara Wilcox
Published in:
Journal of Public Health
|
Issue 8/2023
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Abstract
Aim
This study compared indirect measurement of physical activity (PA) using the International Physical Activity Questionnaire-Short Form (IPAQ-SF) and direct using accelerometers in African American adults.
Subject and methods
African Americans in a southeastern US metropolitan city were recruited to participate in a lifestyle intervention. Participants were predominantly female (79%) and spanned a 40-year age range (min = 25, max = 65). Participants completed the IPAQ-SF and wore an Actigraph GT1M accelerometer on the right hip for a minimum of 7 days, including 1 weekend day. IPAQ-SF data were reduced using IPAQ scoring protocol; accelerometer data were reduced using Freedson cutpoints. We calculated minutes/day of moderate, vigorous, and moderate to vigorous PA, and sedentary time. Descriptive statistics summarized minutes/day. Paired-sample t-tests and Bland–Altman plots compared differences between methods. Pearson correlations assessed associations between the methods.
Results
In total, 158 participants completed the IPAQ-SF and 141 participants had usable accelerometer data. Participants reported significantly more vigorous and moderate to vigorous PA (12.6 ± 29.4 and 10.7 ± 39.1 min/day, respectively) and reported significantly less sedentary time (−189.6 ± 207.0 min/day) on the IPAQ-SF compared to the accelerometer. Correlations of interest ranged from 0.24 to 0.31. Bland–Altman analyses demonstrated measurement error of higher reporting of PA and lower reporting of sedentary time.
Conclusions
Measurement differences were in expected directions. Both measures correlated similarly in our sample compared to other populations. Future studies may compare other indirect measures of PA with direct. Measurement method may influence relationships of physical activity or sedentary time on other outcomes in clinical and practice settings.