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The validity and inter-device variability of the Apple Watch™ for measuring maximal heart rate

Abt, Grant; Bray, James; Benson, Amanda Clare

Authors

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Dr Grant Abt G.Abt@hull.ac.uk
Reader in Sport and Exercise Physiology and Head of Department for Sport, Health and Exercise Science

Dr James Bray J.Bray@hull.ac.uk
Lecturer in Sport and Exercise Nutrition

Amanda Clare Benson

Abstract

Maximal heart rate (HRmax) is a fundamental measure used in exercise prescription. The Apple Watch measures heart rate yet the validity and inter-device variability of the device for measuring HRmax are unknown. Fifteen participants completed a maximal oxygen uptake test while wearing an Apple Watch on each wrist. Criterion HRmax was measured using a Polar T31 chest strap. There were good to very good correlations between the watches and criterion (left: r = 0.87 [90%CI: 0.67 to 0.95]; right: r = 0.98 [90%CI: 0.94 to 0.99]). Standardised mean bias for the left and right watches compared to the criterion were 0.14 (90%CI: -0.12 to 0.39; trivial) and 0.04 (90%CI: -0.07 to 0.15; trivial). Standardised typical error of the estimate for the left and right watches compared to the criterion were 0.51 (90%CI: 0.38 to 0.80; moderate) and 0.22 (90%CI: 0.16 to 0.34; small). Inter-device standardised typical error was 0.46 (90%CI: 0.36 to 0.68; moderate), ICC = 0.84 (90%CI: 0.65 to 0.93). The Apple Watch has good to very good criterion validity for measuring HRmax, with no substantial under- or over-estimation. There were moderate and small prediction errors for the left and right watches. Inter-device variability in HRmax is moderate.

Journal Article Type Article
Publication Date 2018
Journal Journal of Sports Sciences
Print ISSN 0264-0414
Electronic ISSN 1466-447X
Publisher Taylor & Francis
Peer Reviewed Peer Reviewed
Volume 36
Issue 13
Pages 1447-1452
Institution Citation Abt, G., Bray, J., & Benson, A. C. (2018). The validity and inter-device variability of the Apple Watch™ for measuring maximal heart rate. Journal of sports sciences, 36(13), 1447-1452. https://doi.org/10.1080/02640414.2017.1397282
DOI https://doi.org/10.1080/02640414.2017.1397282
Keywords Intensity; Validity; Reliability; Technology
Publisher URL http://www.tandfonline.com/doi/full/10.1080/02640414.2017.1397282
Copyright Statement This is an Accepted Manuscript of an article published by Taylor & Francis Group in Journal of Sports Sciences on 01/11/2017, available online: http://www.tandfonline....0/02640414.2017.1397282
Additional Information Peer Review Statement: The publishing and review policy for this title is described in its Aims & Scope.; Aim & Scope: http://www.tandfonline....cope&journalCode=rjsp20

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Copyright Statement
This is an Accepted Manuscript of an article published by Taylor & Francis Group in Journal of Sports Sciences on 01/11/2017, available online: http://www.tandfonline.com/10.1080/02640414.2017.1397282






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Copyright Statement
This is an Accepted Manuscript of an article published by Taylor & Francis Group in Journal of Sports Sciences on 01/11/2017, available online: http://www.tandfonline.com/10.1080/02640414.2017.1397282



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