I say this is complete BS...performance baseline is relative. We have discussed this in the PED thread.
If you can't even ride, and need some medicine, then are able to compete...I call that serious performance enhancement. From ZERO to, I am king of the mountain.
It might not improve performance for somebody that doesn't have asthma, and takes the medicine. But it certainly helps many to be able to compete. Same argument can be made for testosterone.
European Journal of Applied Physiology and Occupational Physiology
May 1996, Volume 73, Issue 3-4, pp 364-368
"Abstract:
The effect of salbutamol (S) on cycling performance was examined in 15 highly trained non-asthmatic male cyclists. A double-blind, randomized cross-over design was used with S or placebo (P) administered using a metered-dose inhaler and a spacer device 20 min before each testing session. The S dose was 400 μg (four puffs), which is twice the normal therapeutic level. Subjects were habituated to all the laboratory procedures in the week prior to actual data collection. The subjects performed four tests under S and P conditions on separate days over 2 weeks. These included measurement of maximal O2 uptake (V˙O2max) (cycle ergometry) with assessment of pulmonary function before and after, a submaximal (90% of ventilatory threshold) square-wave work transition from a base of unloaded cycling, a 60-s modified Wingate test, and a simulated 20 km time trial. No significant differences were observed in any of the dependent variables related to aerobic endurance or cycling performance between the S and P conditions. These results support other findings that an acute dose (400 μg) of S has no performance-enhancing properties."
I haven't been able to find a study where they do a baseline of asthmatics, then give them an inhaler, and test them again.