Authors of the Polar OH1 validation paper who used a 50 000 USD g.tec medical device used it only as a 1-lead ECG device

Last Updated on January 2, 2024 by pg@petergamma.org

«To minimise artifacts due to electrode movement, the ECG wires were secured to the participant’s body using adhesive medical tape. The voltage difference between electrode sites, LL and RA (i.e., LL-RA) were recorded as 1-lead ECG with a sampling rate of 250Hz. A 0.1-100Hz bandpass filter and a 50Hz notch filter was used as internal filter parameters during ECG acquisition.»

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6532910/

But gold standard for hr measurements on treadmills up to around 15 km/h are 3 channel (or 3 lead ECG) device. 3 channel ECG devices where used for instance in the papers of the Cleveland Clinic in Ohio to validate for instance Apple watches:

090. Review of Accuracy Studies of Consumer Grade Heart Rate Monitors: Methods, Testing Protocols, Reference Devices

They tested the Apple watch 1 and 3 with 3 channel ECG devices. We do not know of newer Apple watches which where tested with 3 channel ECG devices.We do not know of physiologists at the highest level who use consumer grade smart watches for scientific studies. Can these validation papers not be reproduced with newer Apple watches which deliver the same or a higher accuracy? We suggest physiologists at the highest level to use 3 channel ECG devices if possible for applications up to 15 km/h on a treadmill:

091. Low-cost high-quality ECG & EEG devices which offer validation papers