File(s) not publicly available
Stepping up with GGIR: Validity of step cadence derived from wrist-worn research-grade accelerometers using the verisense step count algorithm
journal contributionposted on 2023-03-06, 01:01 authored by AV Rowlands, B Maylor, NP Dawkins, PC Dempsey, CL Edwardson, AA Soczawa-Stronczyk, M Bocian, MR Patterson, T Yates
The Verisense Step Count Algorithm facilitates generation of steps from wrist-worn accelerometers. Based on preliminary evidence suggesting a proportional bias with overestimation at low steps/day, but underestimation at high steps/day, the algorithm parameters have been revised. We aimed to establish validity of the original and revised algorithms relative to waist-worn ActiGraph step cadence. We also assessed whether step cadence was similar across accelerometer brand and wrist. Ninety-eight participants (age: 58.6±11.1 y) undertook six walks (~500 m hard path) at different speeds (cadence: 92.9±9.5–127.9±8.7 steps/min) while wearing three accelerometers on each wrist (Axivity, GENEActiv, ActiGraph) and an ActiGraph on the waist. Of these, 24 participants also undertook one run (~1000 m). Mean bias for the original algorithm was −21 to −26.1 steps/min (95% limits of agreement (LoA) ~±65 steps/min) and mean absolute percentage error (MAPE) 17–22%. This was unevenly distributed with increasing error as speed increased. Mean bias and 95%LoA were halved with the revised algorithm parameters (~-10 to −12 steps/min, 95%LoA ~30 steps/min, MAPE ~10-12%). Performance was similar across brand and wrist. The revised step algorithm provides a more valid measure of step cadence than the original, with MAPE similar to recently reported wrist-wear summary MAPE (7–11%).
JournalJournal of Sports Sciences
Publication classificationC1.1 Refereed article in a scholarly journal
PublisherTAYLOR & FRANCIS LTD
Science & TechnologyLife Sciences & BiomedicineSport SciencesStep countbrisk walkingopen-sourceGENEActivaxivityActiGraphPHYSICAL-ACTIVITYWALKINGADULTSHumansMiddle AgedAgedWristAccelerometryWrist JointAbdomenAlgorithmsWalkingBioengineeringClinical ResearchHuman Movement and Sports Science not elsewhere classifiedCurriculum and Pedagogy not elsewhere classified