To get maximal HRM accuracy, whe have to study and analyse every single ECG peak as attentive as possible. Why does Rob ter Horst not use this method?

In this paper of the Swiss Federal Institute of Sports in Magglingen, single ECG peaks where studied and analysed after the activity: https://pubmed.ncbi.nlm.nih.gov/31004219/ In this paper of the group of Dr. Desai from Cleveland Clinic in Ohio, a cardiologist stood next to the treadmill and studied and analysed every single ECG peak: https://journals.lww.com/acsm-msse/Fulltext/2017/08000/Variable_Accuracy_of_Wearable_Heart_Rate_Monitors.22.aspx In both …