@Edent I suspect they were simply a little ahead of their time. World Rugby is exploring similar tech for concussion monitoring, although not heart rate monitoring or continual realtime transmission... https://www.world.rugby/news/627662/world-rugby-new-zealand-rugby-the-university-of-otago-and-prevent-biometrics-to-undertake-ground-breaking-community-rugby-head-impact-study In theory, with the number of HD cameras around, I would have thought heart rate could be more easily and cheaply monitored from visible facial skin colour changes which has been around for a few years now; https://arxiv.org/ftp/arxiv/papers/2012/2012.15846.pdf World Rugby, New Zealand Rugby, the University of Otago and Prevent Biometrics to undertake ground-breaking community rugby head impact study | World Rugby