found this on WeightWeenies forum
I bet Sky is on something, but its not illegal and probably not pharmacological and their edge comes from properly manipulating it. Think of it this way:
-People know that training at altitude can stimulate red blood cell production. People also know that it can temporarily lower power output. Training in the mountains also involves a very specific neuromuscular type of effort.
-Sky know everything that is required to win a stage race in terms of power output, nutrition, what kind of efforts to train for, and how to monitor rider's progress.
-Most other teams just go to altitude once or twice a year and ride there.
So if its something as simple as an altitude camp perhaps Sky have figured out the key relationship between the altitude effect and race performance. Research on the affects of altitude vary in prescription, but perhaps Sky has figured out the precise timing and type of training to give them even a 5% edge on gains that come from altitude.
Sky also has a lot of riders that lose a lot of weight/mass quickly. Preliminary research on the function of ketosis and carbohydrate restriction on aerobic metabolism and gene expression are really interesting. Even riding fasted in a slightly depleted state has shown to have profound affects on gene expression and adaptation. Maybe, with their absurd budget, they have access to medical professionals that can supervise this type of training so they can do it right up to the red line where they could potentially underfuel/under recover. Hell, I remember Wiggins giving an example of a ketogenic diet he used to follow in the winter, maybe its linked?
To me if all of these things are combined well and used efficiently than there already is an edge there. Compound that with a staff that knows how to plan and control every one of these variables during the year and you have a higher chance of success. I'd like to believe that that's it for now, but maybe there is some other designer substance as well who knows, but I'm not solidly convinced yet because I feel that the team would be more than a one trick pony. They have essentially 1 approach- get really good at climbing at a steady output and time trialling at a steady output for stage races.
Remember how Mapei used to rip apart the classics doped to the gills? Where are Sky's classics results? They have results here and there but by and large they do one thing and do it really well. On the other hand you have a team like BMC where they aren't assembling teams until the last minute, riders don't know if they're riding a GT until a mont in advance, and the team functions like **** together. To me that says a lot about their performance advantages.