The validity and inter-device variability of the Apple Watch™ for measuring maximal heart rate (2017)
Journal Article
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

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 maxim... Read More about The validity and inter-device variability of the Apple Watch™ for measuring maximal heart rate.

Validity and reliability of the Apple Watch for measuring heart rate during exercise (2017)
Journal Article
Khushhal, A., Nichols, S., Evans, W., Gleadall-Siddall, D., Page, R., O'Doherty, A. F., …Abt, G. (2017). Validity and reliability of the Apple Watch for measuring heart rate during exercise. SMIO / Sports Medicine International Open, 1(6), E206-E211. https://doi.org/10.1055/s-0043-120195

We examined the validity and reliability of the Apple Watch heart rate sensor during and in recovery from exercise. Twenty-one males completed treadmill exercise while wearing two Apple Watches (left and right wrists) and a Polar S810i monitor (crite... Read More about Validity and reliability of the Apple Watch for measuring heart rate during exercise.