I had ablation for PSVT and resumed training for a marathon @ +2 weeks and completed the marathon @ +16 weeks (ish).
I did notice that it took 4 weeks to get into any kind of "shape." It took a solid 8 weeks for me to get over the "blips and flips" that are common after the procedure.
Regarding speed - post ablation, I became more confident in my training and worked on, thereby increasing speed pretty significantly.
If the SVT is controlled, then the ablation should have been successful and not changed any of your normal rhythm that was controlling you during aerobic exercise. Are you done w/ SVT episodes? Do you wear a heart rate monitor? Can you acheive the same (controlled) HR post ablation?
***** man... 'cos it's supposed to be a fix.
I feel like im in shape but when wearing a montior I noticed standing in the sun my heart rate went up to 100 bpm for a few min and then went down to around 80 for a few. I don't feel it like I use to but I think its still there.