Temporal Alignment of Dual Monitor Accelerometry Recordings
Combining accelerometry from multiple independent activity monitors worn by the same subject have gained widespread interest with the assessment of physical activity behavior. However, a difference in the real time clock accuracy of the activity monitor introduces a substantial temporal misalignment...
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doaj-071a4896976944b98374849f9febfe612021-07-23T14:05:41ZengMDPI AGSensors1424-82202021-07-01214777477710.3390/s21144777Temporal Alignment of Dual Monitor Accelerometry RecordingsJan Christian Brønd0Natascha Holbæk Pedersen1Kristian Traberg Larsen2Anders Grøntved3Centre for Research in Childhood Health/Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, 5220 Odense, DenmarkCentre for Research in Childhood Health/Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, 5220 Odense, DenmarkCentre for Research in Childhood Health/Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, 5220 Odense, DenmarkCentre for Research in Childhood Health/Research Unit for Exercise Epidemiology, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, 5220 Odense, DenmarkCombining accelerometry from multiple independent activity monitors worn by the same subject have gained widespread interest with the assessment of physical activity behavior. However, a difference in the real time clock accuracy of the activity monitor introduces a substantial temporal misalignment with long duration recordings which is commonly not considered. In this study, a novel method not requiring human interaction is described for the temporal alignment of triaxial acceleration measured with two independent activity monitors and evaluating the performance with the misalignment manually identified. The method was evaluated with free-living recordings using both combined wrist/hip (<i>n</i> = 9) and thigh/hip device (<i>n</i> = 30) wear locations, and descriptive data on initial offset and accumulated day 7 drift in a large-scale population-based study (<i>n</i> = 2513) were calculated. The results from the Bland–Altman analysis show good agreement between the proposed algorithm and the reference suggesting that the described method is valid for reducing the temporal misalignment and thus reduce the measurement error with aggregated data. Applying the algorithm to the <i>n</i> = 2513 samples worn for 7-days suggest a wide and substantial issue with drift over time when each subject wears two independent activity monitors.https://www.mdpi.com/1424-8220/21/14/4777clock driftmethodmeasurement biassensor fusion |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jan Christian Brønd Natascha Holbæk Pedersen Kristian Traberg Larsen Anders Grøntved |
spellingShingle |
Jan Christian Brønd Natascha Holbæk Pedersen Kristian Traberg Larsen Anders Grøntved Temporal Alignment of Dual Monitor Accelerometry Recordings Sensors clock drift method measurement bias sensor fusion |
author_facet |
Jan Christian Brønd Natascha Holbæk Pedersen Kristian Traberg Larsen Anders Grøntved |
author_sort |
Jan Christian Brønd |
title |
Temporal Alignment of Dual Monitor Accelerometry Recordings |
title_short |
Temporal Alignment of Dual Monitor Accelerometry Recordings |
title_full |
Temporal Alignment of Dual Monitor Accelerometry Recordings |
title_fullStr |
Temporal Alignment of Dual Monitor Accelerometry Recordings |
title_full_unstemmed |
Temporal Alignment of Dual Monitor Accelerometry Recordings |
title_sort |
temporal alignment of dual monitor accelerometry recordings |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2021-07-01 |
description |
Combining accelerometry from multiple independent activity monitors worn by the same subject have gained widespread interest with the assessment of physical activity behavior. However, a difference in the real time clock accuracy of the activity monitor introduces a substantial temporal misalignment with long duration recordings which is commonly not considered. In this study, a novel method not requiring human interaction is described for the temporal alignment of triaxial acceleration measured with two independent activity monitors and evaluating the performance with the misalignment manually identified. The method was evaluated with free-living recordings using both combined wrist/hip (<i>n</i> = 9) and thigh/hip device (<i>n</i> = 30) wear locations, and descriptive data on initial offset and accumulated day 7 drift in a large-scale population-based study (<i>n</i> = 2513) were calculated. The results from the Bland–Altman analysis show good agreement between the proposed algorithm and the reference suggesting that the described method is valid for reducing the temporal misalignment and thus reduce the measurement error with aggregated data. Applying the algorithm to the <i>n</i> = 2513 samples worn for 7-days suggest a wide and substantial issue with drift over time when each subject wears two independent activity monitors. |
topic |
clock drift method measurement bias sensor fusion |
url |
https://www.mdpi.com/1424-8220/21/14/4777 |
work_keys_str_mv |
AT janchristianbrønd temporalalignmentofdualmonitoraccelerometryrecordings AT nataschaholbækpedersen temporalalignmentofdualmonitoraccelerometryrecordings AT kristiantraberglarsen temporalalignmentofdualmonitoraccelerometryrecordings AT andersgrøntved temporalalignmentofdualmonitoraccelerometryrecordings |
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