The paper «RR interval signal quality of a heart rate monitor and an ECG Holter at rest and during exercise» which was partly financed by Polar – a special paper so that Rob ter Horst can sell us the Polar H10 chest strap?

Rob ter Horst’s review about this paper: The paper was partly funded by Polar: https://pubmed.ncbi.nlm.nih.gov/31004219/ Is all of this convincing to critical scientists? Or is it more a marketing show which is partly funded by Polar? What is your opinion about this topic. Write it in the comments below.