-
Hmm. Ok all that well may be true but would the uci not take into account this variability when they set the limit for that particular specified substance in the first place? Possibly not, and it may need reevaluating. However does anybody actually have a figure on the number of pro peloton athletes who have asthma/use inhalers? I’m likely wrong but I have it in my mind it’s quite high, and given that a lot of these inhaler users will be be in a similar physical state to froome, And between the entire peleton get tested so often wouldnt we see a much much higher false positive rate if the limit was so easily exceeded by physiological and QC variability than the 3 or so in the past 4-5 years?
-
he said that Salbutamol has NO inherent performance benefit, it merely allows an asthmathic to perfom to his/her inherent ability just like a non asthma sufferer, no more no less.
This is true, as far as we know, for the permitted doses and routes of administration. It is not true for larger oral doses. There is a threshold for salbutamol not because it might be a masking agent, but because high doses are known to have anabolic effects.
-
my father said that Salbutomol has a notoriously poor level of uptake on inhaled delivery, as low as 30%, which is far lower than many other drugs. As such, 70% can be passed out in the urine at any given moment, hence his arguement that blood-tests should be used rather than urine tests to show how much is actually being absorbed in the blood as opposed to simply washed through
Either his father doesn't know what he's taking about, or he didn't properly understand what his father told him.
Inhaled salbutamol tends to end up in one of three places; the target receptors in the lungs (this is where the 30% (±10) comes into it), deposited in the mouth and swallowed, or exhaled. The exhaled portion obviously can't have any effect, it's just wasted. The portion which is on target is eventually transported via the blood stream to the kidneys and pissed out, as is the swallowed portion which is absorbed through the gut. While it's in transit in the bloodstream, it can have systemic effects which are either unwanted drug side effects or desired performance enhancing effects, depending on who's asking. Inhalation of small doses (100μg nominal per puff) is chosen for therapeutic use because it minimises side effects, and for exactly the same reason it's a pretty useless way to try to get performance enhancing effects. When I was a boy, before metered does inhalers were ubiquitous, we used to take 4mg tablets and live with the side effects. Anybody trying to get measurable performance enhancement from salbutamol will be taking 2-4 of those every day for weeks or months at a time.
Lifted this comment from cyclingnews, thought it illuminating: