Rob ter Horst’s conflict of interest with Polar Rob ter Horst reviews a paper about the Polar H10 which as been partly funded by Polar. https://pubmed.ncbi.nlm.nih.gov/31004219/ Conflict of interests in papers about consumer grade heart rate monitors performed at the Cleveland Clinic in Ohio https://journals.lww.com/acsm-msse/Fulltext/2017/08000/Variable_Accuracy_of_Wearable_Heart_Rate_Monitors.22.aspx 2. Accuracy of commercially available heart rate monitors in athletes: …