The accuracy of optical heart rate sensors for sporting activities has increased in recent years, but we know only of little development for those for research and clinical applications

The only development of which we know is HeartPy from Paul van Gent, Delft University of Technology the Netherlands: https://scholar.google.com/citations?user=OOhuA6gAAAAJ&hl=it and Peter H. Charlton from University of Cambridge which uses HeartPy: https://scholar.google.co.uk/citations?user=BJjD81oAAAAJ&hl=en but we know only of his YouTube examples about it. And Talha Iqbal from the University of Galway, Ireland Galway which uses HeartPy: …