@article { , title = {The validity and inter-device variability of the Apple Watchâ„¢ for measuring maximal heart rate}, 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.}, doi = {10.1080/02640414.2017.1397282}, eissn = {1466-447X}, issn = {0264-0414}, issue = {13}, journal = {Journal of Sports Sciences}, pages = {1447-1452}, publicationstatus = {Published}, publisher = {Taylor and Francis}, url = {https://hull-repository.worktribe.com/output/479678}, volume = {36}, keyword = {Personal Technologies, Health and Health Inequalities, Intensity, Validity, Reliability, Technology}, year = {2024}, author = {Abt, Grant and Bray, James and Benson, Amanda Clare} }