Reported and Device-Based Physical Activity By Race/Ethnic Groups in Young-Old Women
in Journal for the Measurement of Physical BehaviourPurpose: To examine racial/ethnic differences in participant-reported and device-based estimates of sedentary and physical activity behaviors and correlations between measurement methods in midlife and young-old women. Methods: Data are from 1,257 Study of Women’s Health Across the Nation participants, aged 60–72 who agreed to participate in an accelerometer protocol and had valid wear time (46% White, 26% Black, 12% Chinese, 10% Japanese, 6% Hispanic). Measures from the Kaiser Physical Activity Scale (KPAS) and ActiGraph wGT3X-BT were summarized overall and by race/ethnic groups. Partial Spearman rank order correlation coefficients between the KPAS and accelerometer were computed overall and by race/ethnic groups. Fisher’s z transformation-derived confidence intervals were calculated to evaluate differences in observed correlations in the various race/ethnic groups, compared to White women. Results: Participants spent an average of 7.5 ± 2.1 h·d−1 in sedentary behaviors, 4.5 ± 1.1 h·d−1 and 2.3 ± 0.8 h·d−1 in low or high light intensity physical activity, respectively, and 56 ± 35 min·d−1 in moderate-to-vigorous intensity physical activity. Time spent in each category differed by race/ethnic group. Overall, correlation coefficients comparing the KPAS domain-specific and total physical activity scores with accelerometry were low to moderate (range: 0.062–0.462), and few statistically significant differences in correlations were noted for race/ethnic groups, compared to White women. Conclusions: Study findings complement prior studies describing sedentary and physical activity behaviors using multi-methods in a diverse population of older women, and provide additional evidence on the convergent validity of the KPAS by race/ethnic groups.
Stewart and Colvin are with the Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA. Sternfeld is with the Division of Research, Kaiser Permanente Northern California, Oakland, CA, USA. Lange-Maia is with the Department of Preventive Medicine, Center for Community Health Equity, Rush System for Health, Chicago, IL, USA. Ylitalo is with the Department of Public Health, Robbins College of Health and Human Sciences, Baylor University, Waco, TX, USA. Karvonen-Gutierrez is with the Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, MI, USA. Dugan is with the Department of Physical Medicine and Rehabilitation, Rush University System for Health, Chicago, IL, USA. Green is with The Saul R. Korey Department of Neurology, Albert Einstein College of Medicine, Jersey City, NJ, USA. Pettee Gabriel is with the Department of Epidemiology, The University of Alabama at Birmingham, Birmingham, AL, USA.
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