Measurement performance of activity measurements with newer generation of Apple watch in wheelchair users with spinal cord injury
<p> <b>Background</b> The level of physical activity (PA) of people with spinal cord injury (SCI) has an impact on long-term complications. Currently, PA is mostly assessed by interviews. Wearable activity trackers are promising tools to objectively measure PA under everyday condit...
Gespeichert in:
| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
02. Dezember 2021
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| In: |
Methods of information in medicine
Year: 2021, Jahrgang: 60, Pages: 103-110 |
| ISSN: | 2511-705X |
| DOI: | 10.1055/s-0041-1740236 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1055/s-0041-1740236 Verlag, lizenzpflichtig, Volltext: http://www.thieme-connect.de/DOI/DOI?10.1055/s-0041-1740236 
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| Verfasserangaben: | Nils-Hendrik Benning, Petra Knaup, Rüdiger Rupp |
MARC
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| 520 | |a <p> <b>Background</b> The level of physical activity (PA) of people with spinal cord injury (SCI) has an impact on long-term complications. Currently, PA is mostly assessed by interviews. Wearable activity trackers are promising tools to objectively measure PA under everyday conditions. The only off-the-shelf, wearable activity tracker with specific measures for wheelchair users is the Apple Watch.</p> <p> <b>Objectives</b> This study analyzes the measurement performance of Apple Watch Series 4 for wheelchair users and compares it with an earlier generation of the device.</p> <p> <b>Methods</b> Fifteen participants with subacute SCI during their first in-patient phase followed a test course using their wheelchair. The number of wheelchair pushes was counted manually by visual inspection and with the Apple Watch. Difference between the Apple Watch and the rater was analyzed with mean absolute percent error (MAPE) and a Bland-Altman plot. To compare the measurement error of Series 4 and an older generation of the device a <i>t</i>-test was calculated using data for Series 1 from a former study.</p> <p> <b>Results</b> The average of differences was 12.33 pushes (<i>n</i> = 15), whereas participants pushed the wheelchair 138.4 times on average (range 86-271 pushes). The range of difference and the Bland-Altman plot indicate an overestimation by Apple Watch. MAPE is 9.20% and the <i>t</i>-test, testing for an effect of Series 4 on the percentage of error compared with Series 1, was significant with <i>p</i> < 0.05.</p> <p> <b>Conclusion</b> Series 4 shows a significant improvement in measurement performance compared with Series 1. Series 4 can be considered as a promising data source to capture the number of wheelchair pushes on even grounds. Future research should analyze the long-term measurement performance during everyday conditions of Series 4.</p> | ||
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