Purpose: This study aimed to implement an aggregation method in Matlab for generating ActiGraph counts from raw acceleration recorded with an alternative accelerometer device and to investigate the validity of the method.
Methods: The aggregation method, including the frequency band-pass filter, was implemented and optimized based on standardized sinusoidal acceleration signals generated in Matlab and processed in the ActiLife software. Evaluating the validity of the aggregation method was approached using a mechanical setup and with a 24-h free-living recording using a convenient sample of nine subjects. Counts generated with the aggregation method applied to Axivity AX3 raw acceleration data were compared with counts generated with ActiLife from ActiGraph GT3X+ data.
Results: An optimal band-pass filter was fitted resulting in a root-mean-square error of 25.7 counts per 10 s and mean absolute error of 15.0 counts per second across the full frequency range. The mechanical evaluation of the proposed aggregation method resulted in an absolute mean ± SD difference of −0.11 ± 0.97 counts per 10 s across all rotational frequencies compared with the original ActiGraph method. Applying the aggregation method to the 24-h free-living recordings resulted in an epoch level bias ranging from −16.2 to 0.9 counts per 10 s, a relative difference in the averaged physical activity (counts per minute) ranging from −0.5% to 4.7% with a group mean ± SD of 2.2% ± 1.7%, and a Cohen’s kappa of 0.945, indicating almost a perfect agreement in the intensity classification.
Conclusion: The proposed band-pass filter and aggregation method is highly valid for generating ActiGraph counts from raw acceleration data recorded with alternative devices. It would facilitate comparability between studies using different devices collecting raw acceleration data.
1Center for Research in Childhood Health/Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, DENMARK; 2Faculty of Teacher Education and Sport, Western Norway University of Applied Sciences, Campus Sogndal, NORWAY; 3Norwegian School of Sport Sciences, Department of Sports Medicine, Oslo, NORWAY; 4Unit for Clinical Physiology, Department of Translational Medicine, Lund University, Malmö, SWEDEN; and 5Center for Health and Performance, Department of Food and Nutrition, and Sport Science, University of Gothenburg, Gothenburg, SWEDEN
Address for correspondence: Jan Christian Brønd, M.Sci., Center for Research in Childhood Health/Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark; E-mail: firstname.lastname@example.org.
Submitted for publication January 2017.
Accepted for publication June 2017.
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