Got fitted with an ECG Holter today, with instructions to go for a ride, so I did. At around 200 metres from home pain started under left armpit, propagated across to breastbone and then, when after 3 km I started into the 6% hill out of our valley, downwards and a bit into the left arm. About halfway up it was too intense for fun so I turned tail. By the time I got home I felt fine.
The dumb thing is that all the time I felt as strong as ever and still do.
It'll be interesting (as in times) to hear what the cardio unit think, once they get round to it.