Why Rob ter Horst could not convince us personally to use the Polar H10 or one of his 100 smartwatches to us for our scientific studies

About two years ago Peter Gamma from www.petergamma.org critisized Rob ter Horst PhD. for not testing his smartwatches: against clinical or research grade reference devices as those listed here: Shortly after that, Rob ter Horst published a video on his YouTube channel about the Polar H10: Where he reviewed this paper: https://pubmed.ncbi.nlm.nih.gov/31004219 And Rob ter …