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Comparability of measured acceleration from accelerometry-based activity monitors

Lookup NU author(s): Professor Mike Catt


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Copyright © 2014 by the American College of Sports Medicine. Background: Accelerometers that provide triaxial measured acceleration data are now available. However, equivalence of output between brands cannot be assumed and testing is necessary to determine whether features of the acceleration signal are interchangeable. Purpose: This study aimed to establish the equivalence of output between two brands of monitor in a laboratory and in a free-living environment. Methods: For part 1, 38 adults performed nine laboratory-based activities while wearing an ActiGraph GT3X+ and GENEActiv (Gravity Estimator of Normal Everyday Activity) at the hip. For part 2, 58 children age 10-12 yr wore a GT3X+ and GENEActiv at the hip for 7 d in a free-living setting. Results: For part 1, the magnitude of time domain features from the GENEActiv was greater than that from the GT3X+. However, frequency domain features compared well, with perfect agreement of the dominant frequency for 97%-100% of participants for most activities. For part 2, mean daily acceleration measured by the two brands was correlated (r = 0.93, P < 0.001, respectively) but the magnitude was approximately 15% lower for the GT3X+ than that for the GENEActiv at the hip. Conclusions: Frequency domain-based classification algorithms should be transferable between monitors, and it should be possible to apply time domain-based classification algorithms developed for one device to the other by applying an affine conversion on the measured acceleration values. The strong relation between accelerations measured by the two brands suggests that habitual activity level and activity patterns assessed by the GENE and GT3X+ may compare well if analyzed appropriately.

Publication metadata

Author(s): Rowlands AV, Fraysse F, Catt M, Stiles VH, Stanley RM, Eston RG, Olds TS

Publication type: Article

Publication status: Published

Journal: Medicine and Science in Sports and Exercise

Year: 2015

Volume: 47

Issue: 1

Pages: 201-210

Print publication date: 01/01/2015

Acceptance date: 01/01/1900

ISSN (print): 0195-9131

ISSN (electronic): 1530-0315

Publisher: Lippincott Williams and Wilkins


DOI: 10.1249/MSS.0000000000000394

PubMed id: 24870577


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