Validity of the Apple Watch® for monitoring push counts in people using manual wheelchairs.

The Journal of Spinal Cord Medicine
Kati S KarinharjuSjaan R Gomersall

Abstract

Objective: A recent Apple Watch® activity-monitoring innovation permits manual wheelchair users to monitor daily push counts. This study evaluated the validity of the Apple Watch® push count estimate.Design: Criterion validity.Setting: Southern Finland and Southeast Queensland, Australia.Participants: Twenty-six manual wheelchair users from Finland and Australia were filmed completing a standardized battery of activities while wearing the Apple Watch® (dominant wrist).Outcome Measures: Wheelchair pushes as determined by the Apple Watch® were compared to directly observed pushes.Results: Agreement between Apple Watch® push counts and directly observed pushes was evaluated using Intraclass correlation coefficients (ICC), Pearson correlations and Bland-Altman analyses. Apple Watch® pushes and directly observed push counts were strongly correlated (ICC = 0.77, P < 0.01) (r = 0.84, P < 0.01). Bland Altman plots indicated that the Apple Watch® underestimated push counts (M = -103; 95% ULoA = 217; LLoA = -423 pushes). Mean absolute percentage error was 13.5% which is comparable to studies evaluating agreement between pedometer-based step counts and directly observed steps.Conclusion: Apple Watch® push-count estimates are acceptable fo...Continue Reading

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Sep 29, 2020·Endocrinology and Metabolism·Hun-Sung Kim, Kun-Ho Yoon
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