CYCLING PERFORMANCE TIPS
This article tells us that you can extract mitochondria from one area (abdominal wall cells) and then introduce them into others (damaged heart muscles in this case). The next step, which I'm sure someone else has considered and is already working on in some lab, is manipulating (basically "rev-ing up") isolated mitochondria in a test tube with the plan to re-infuse them into damaged muscles. Then it is just a short step to repeating the process with healthy cycling muscles (Quadriceps basically).
On the edge of current capabilities, but then who thought you could revive damaged heart muscles almost certainly destined to die.