He was running with a TomTom Runner 2 Cardio (or a pair of them) which records cadence as well as HR so it would be a fair bit of work to fake it but not impossible, and more likely the longer we wait to see it. Top cyclists upload rides from the continental tours almost as soon as they get off the bike at the end of the day. The Tour de Suisse had about 45 riders uploading I think including Alex Dowsett.
I think RY is going to take some painful lessons away from this. Do you know he didn't even tell his support team he had started for the first 2.5h? Hardly surprising there is scepticism.
WADA pre-announce list additions each September to take effect from the following January. All sportsmen and women should be checking that list including looking at alternative names for each of their drugs. This is the same drug that Aregawi and some other Ethiopian runners have been busted for. Aregawi just said she don't know how it got into her. I'd put her response in the same category as Sharapova's myself.
I'd love to hear an update from Sharapova as presumably she now has an urgent need for a replacement angina/dodgy ECG drug, right?