A full stress ECG on a treadmill would have done so, yet this is not a requirement even for Class 1 for renewal.
Could you say that you may have suspected something was not right if you vigorously exercised?
It's a genuine question.
How many problems would it uncover in the professional world, if it was required at renewal?
The airline pilots have pretty aggressive unions, whose reach goes way beyond representing pilots. They have had a big hand in sinking various efforts at a more accessible private IR, too.