Disparities in adherence to physical activity guidelines among US adults: A population-based study.

The objective of this study was to determine adherence to national guidelines for aerobic and muscle-strengthening physical activity among United States (US) adults and identify factors associated with guideline nonadherence. The 2022 National Health Interview Survey data were analyzed to evaluate self-reported physical activity among 26,494 US adults. Adherence to national guidelines was defined as engaging in ≥150 minutes moderate-intensity or ≥75 minutes vigorous-intensity aerobic activity/week, and muscle-strengthening activity ≥2 days/week. A multivariable logistic regression model evaluated associations between 24 sociodemographic and health variables with nonadherence to physical activity guidelines. Shapley Additive Explanations were used to assess the relative importance of each factor in the model. The population-weighted analysis revealed that only 24.3% of US adults met both the aerobic and muscle-strengthening activity guidelines. The regression model identified 17 factors significantly associated with nonadherence. When evaluating the relative importance of these variables, older age, lower educational attainment, and lower household income emerged as the primary determinants of nonadherence. Guideline adherence was lowest among subgroups with multiple risk factors, with only 6.5% of older adults with lower income and education meeting the guidelines. In contrast, adherence was 42.7% in younger respondents with higher incomes and educational attainment. In conclusion, physical activity rates among US adults remain below public health targets, with significant disparities among sociodemographic groups. Expanded outreach efforts targeting higher-risk populations are urgently needed to address barriers, promote physical activity engagement, and achieve health equity.