craig1985 said:

Rollin is 188cm tall and weights 83kg. So what is his power to weight ratio and how is it worked out? It is something you can take from his weight and the amount of watts he can produce?

So how do we determine whether or not somebody is up to no good or not?

Power to weight is a fairly simple calculation. If you know somebody's power output (in watts), and their weight (in kg), you simply divide power by weight.

A few months ago, I borrowed a powertap and measured myself doing a 20 minute reasonably hard effort. I averaged 270 watts. I weigh about 68 kg, so my power to weight ratio over that time was 3.97 W/kg. (Yes, I'm very, very mediocre!)

As I understand it, typically such measurements are taken over periods of about an hour. Over that period, at the end of stages, grand tour GC contenders can do over 6 W/kg.

Sprints are "anerobic" efforts, and much of the time are conducted on level ground, so weight is pretty much irrelevant as a factor, and W/kg is not considered an important statistic for sprinters. Sprint efforts wouldn't be helped directly by EPO (though the EPO might well ensure they're still in the peloton when the sprint starts).

Incidentally, I would have thought that the world-class sprinters would have higher peak power figures.

If you're interested in power outputs and doping, I'd suggest you spend some time browsing the archives of

The Science of Sport, which has some fascinating analysis.