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@villa-ru
Sadly I'm not subscribed to European Respiratory Monthly.
Anyway - that's my point. Their sample populations must be a bit shit.because one of the reasons people cycle is that it is faster. You'd need to compare people on the same length route at the very least to draw a conclusion.
It's not much use to say "they've got more crap in them because they've been exposed to it longer" is it? IANAS, mind.