I had to laugh when I first read your post Nadine because I went bike riding this evening and kept at a pretty good pace, so my first thought was that my rapid heart beat could have provided the mechanical energy for a heart monitor but then I realized you meant the vibration caused by the impact/motion of the runner's feet going up and down with impact.
This is a perfect application for energy harvesting. With it, the vehicle uses no onboard energy source to power the TPM system, other than the tires themselves. Another great energy harvesting story, Liz.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.