Journal of Personalized Medicine.
URL: https://doi.org/10.3390/jpm7020003
Abstract. Journal of Personalized Medicine 2017;7(2):3. Evaluation of seven wrist-worn devices in a diverse 60-person cohort, finding heart-rate error within 5% for most devices at rest but substantially higher energy-expenditure error, with darker skin tone, larger wrist circumference, and higher BMI correlating with increased heart-rate measurement error.