Spooky - I've just been up there too !! I only passed one runner, she was coming under the underpass as I returned - was that you?. Overtook one poor MTBer on the steep bit - I'm convinced he got off after I went by.
First time I've run up and still tired from a 4 1/2 hour bike ride yesterday, will have another go later see how much faster I can do it.
Sorry to hear you ended up on bbs, I refused to go on them and they gave me Procoralan instead (not sure if they would work with your prob). This would be a good question to ask on the cardiacathletes forum. I vaguely recall some people took half a dose am then the rest later but not sure if that would be sufficient and I'm not a doc of course...
I'm being investigated now for VT, how bad is yours ie how long and high do the episodes go and do they self resolve eventually anyway or do they need cardioversion? I have an ICD but the probs I am having aren't high enough to trigger therapy.
I know you are keen to try your heart out but I'd concentrate on running by feel. I had different heart probs and went through an official cardiac rehab program supervised by nurses, they did a formula calculation (I think they used the Karvonen one which wasn't far out for me) and we worked to a safe percentage of that. They were pretty horrified when I told them I was off for my first race
The probs at the beginning may be poor contact/lack of moisture under the strap. It depends how good your strap is and how much you wet it and how much you sweat as you go along.
It's a bit light all around to be honest. Especially the track which is too slow and too low volume. I ran under 33.00 and we were doing 4-5x1M in about 4.55 in winter with a lap jog rec. But mile reps can be tough mentally if you try doing them solo.