You've got me curious now... I wonder what my maximum is these days? I'm sure that it is still well over 150 but there is no way that it can still be 200!
I have to be slightly careful though. I used to be able to push myself as hard as I liked and all that happened was that I got out of breath and tired. If I really push hard now I can trigger arrhythmia which can last for 12-24 hours. I'll see how high the pulse goes for a ~95% effort and leave it at that!
How will you know what 95% is going to be?