Influence of accelerometer calibration approach on MVPA estimates for adults
ISPAH ePoster Library. Matthews C. Oct 16, 2018; 225411; 117
Charles Matthews
Charles Matthews
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Abstract Purpose. To compare estimates of moderate-vigorous physical activity (MVPA) duration derived from accelerometers calibrated only to walking and running activities to estimates from calibrations based on a broader range of lifestyle and ambulatory activities. Methods. In a study of 932 older (50-74 yrs) adults we compared MVPA estimates from accelerometer counts based on three ambulatory calibration methods (Freedson 1952 counts/min (cpm); Sasaki 2690 cpm; activPAL 3+ METs) to estimates based on calibrations from lifestyle and ambulatory activities combined (Matthews 760 cpm; Crouter 3+ METs; Sojourn3x 3+ METs). We also examined data from up to 6 previous-day recalls describing the MVPA in this population. Results. MVPA duration values derived from ambulatory calibration methods were significantly lower than methods designed to capture a broader range of both lifestyle and ambulatory activities (p < 0.05). MVPA (hrs/d) estimates in all participants were: Freedson (median [inter-quartile range]=0.35 [0.17-0.58]); Sasaki (0.91 [0.59-1.32]); and activPAL (0.97 [0.71-1.26]) compared to Matthews (1.82 [1.37-2.34]); Crouter (2.28 [1.72-2.82]); and Sojourn3x (1.85 [1.42-2.34]). Recall-based estimates in all participants were comparable (1.61 [0.89-2.57]) and indicated participation in a broad range of lifestyle and ambulatory MVPA. Conclusion. Accelerometer calibration studies that employ only ambulatory activities may produce MVPA duration estimates that are substantially lower than methods calibrated to a broader range of activities. These findings highlight the potential to reduce differences among device-based measures of MVPA due to variation in calibration study design by including a variety of lifestyle and ambulatory activities.
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