摘要：Objectives. We compared findings on physical activity from national accelerometry data and Healthy People 2010 self-report data to identify differences in disparities by sociodemographic characteristics, gender, age, race/ethnicity, education level, and disability status. Methods. Data were from the 2003 to 2004 National Health and Nutrition Examination Survey's accelerometry and the Healthy People 2010 Midcourse Review . We computed prevalence of inactivity and regular moderate- and vigorous-intensity movement according to Healthy People 2010 operational definitions. Results. Mexican American adults were more active than non-Hispanic Blacks and Whites, and groups defined by race/ethnicity and educational attainment were more similar in physical activity in accelerometer than in self-report data. Disparities by gender and disability status were consistent with Healthy People 2010 . Conclusions. Disparities in physical activity differ from previous findings. Increased understanding of these disparities should be used to design better and more cost-effective physical activity interventions. Physical activity surveillance methods should be revised to make use of data collection methods that are more valid than self-report. Healthy People 2010 objectives are used for many purposes, including addressing health disparities by informing policy and justifying community intervention programs. Physical activity plays a key role in the Healthy People 2010 overarching goals of increasing quality and years of healthy life and eliminating health disparities. 1 Three Healthy People 2010 physical activity objectives designed for adults aim to reduce the prevalence of no leisure-time physical activity (22-1), increase regular physical activity (22-2), and increase vigorous-intensity physical activity (22-3). 1 Progress toward meeting the Healthy People 2010 physical activity objectives 2 is evaluated with self-report data from the National Health Interview Survey (NHIS) 3 and at the state level from the Behavioral Risk Factor Surveillance System. 4 The Healthy People 2010 Midcourse Review found sociodemographic disparities in physical activity, with racial/ethnic minorities less active than Whites and activity levels positively associated with more education. 5 From 2003 to 2006 the National Health and Nutrition Examination Survey (NHANES) measured physical activity with accelerometers, small electronic devices that record bodily acceleration minute by minute, to provide an objective estimate of intensity and duration of locomotion. 6 As the first nationally representative sample of accelerometry data in the United States, 7 the NHANES data are significant for public health surveillance because they enable an alternative view of population physical activity levels not subject to the potential biases of self-report. The 2 methods can produce differing results on disparities and physical activity prevalence. The initial analyses of the NHANES accelerometer data found that Mexican Americans were more active than non-Hispanic Whites and that non-Hispanic Blacks were the least active racial/ethnic group. 7 – 9 These findings were inconsistent with survey data. 2 , 4 Thus, the inclusion of accelerometry to assess physical activity in surveillance settings has revealed previously unknown information, causing public health professionals to reevaluate some long-standing beliefs about disparities in physical activity. 2 , 4 , 10 – 12 Little is known about disparities in physical activity captured by accelerometry data and applied to the Healthy People 2010 physical activity objectives for adults. We assessed sociodemographic disparities in physical activity identified in NHANES accelerometry data for indicators that were equivalent to the Healthy People 2010 objectives. We also aimed to determine whether disparities identified in accelerometer data differed from those in Healthy People 2010 's NHIS self-report data. We compared the disparities in the 2003 to 2004 NHANES data with those in the Healthy People 2010 data for 2003.
