Bad Wigins wrote:
The predicted pace would have to be amazingly accurate for it to be any use. Either I'd keep up easily, or it would outpace me. I don't know within a few seconds what pace I can maintain.
You could actually know if you wanted to. There are quite a few sophisticated mathematical models, including but not limited to power-duration curve, there are devices that collect all the data from your runs and software that does number-crunching. And it's not even exclusive to elites, quite the contrary: this kind of stuff is mostly popular among amateur runners in their 30s-40s who have some disposable income.
Of course it's mostly done for the love of number-crunching and has limited use for the running itself. The main reason is that real conditions on race day can be quite unpredictable and your model can just fly out the window. However if this is a track race, wind and elevation changes are of no concern, temperature is an input for your updated model, and the pacing lights can all but negate the psychological factors which might otherwise cause the athlete to make pacing mistakes. Basically the lights are making your real track race as close to the abstract model as possible, perhaps even closer than treadmill.