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LEVELS OF WRIST-MEASURED PHYSICAL ACTIVITY CORRESPONDING TO SELF-REPORTED COMPLIANCE WITH PHYSICAL ACTIVITY GUIDELINES: NHANES 2011-2014

Abstract

H. Rosas, J. M. Schuna Jr.

Oregon State University, Corvallis, OR

The 2018 Physical Activity Guidelines for Americans (PAGA), specifically the aerobic component, advises adults to accumulate ≥ 150 min/week of moderate-to-vigorous physical activity (MVPA). The necessary amount of daily wrist-measured accelerometer-determined physical activity volume, expressed in monitor independent movement summary units (MIMS units/day), that best delineates compliance vs. non-compliance with the 2018 PAGA remains unknown. PURPOSE: To identify an optimal wrist-measured accelerometer-determined threshold of MIMS units/day that delineates self-reported compliance vs. non-compliance with the 2018 PAGA (≥ 150 vs. < 150 min/week of MVPA). METHODS: We conducted a secondary data analysis among 9,306 adults (ages: 18-85+; sex: 52.4% female) who provided self-reported physical activity data and ≥ 1 valid day of wrist-measured accelerometer data collected during the 2011-2014 National Health and Nutrition Examination Survey. A receiver operating characteristic curve was fit to identify optimal thresholds of mean MIMS units/day for delineating self-reported compliance vs. non-compliance to the 2018 PAGA. RESULTS: Mean MIMS units/day was a significant predictor of self-reported compliance with the 2018 PAGA (p < 0.001); however, the ability to discriminate between compliance and non-compliance was poor as evidenced by an overall area under the curve of 0.616 (95% CI: 0.603 – 0.629). The optimal threshold of wrist-measured accelerometer-determined physical activity for delineating compliance vs. non-compliance with the 2018 PAGA was 12,171.8 MIMS units/day (95% CI: 12,099.2 – 12,752.1 MIMS units/day) corresponding to a sensitivity of 63.8% (95% CI: 58.9 - 65.2%) and a specificity of 54.2% (95% CI: 52.7 - 59.1%). CONCLUSION: The optimal threshold of wrist-measured accelerometer-determined MIMS units/day identified herein should be interpreted with caution, despite its potential to have some value in describing the objectively-monitored behavior of individuals reporting compliance or non-compliance to the 2018 PAGA. Future research is needed to aid the development of physical activity guidelines derived from wrist-measured accelerometer-determined estimates of physical activity.

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