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 …