Interesting thread for me this, as I get mild asthma from time to time and have tried to find out more information about any problems with freediving. My asthma is usually bought on by exercise in the cold or household dust (im allergic to cleaning) Interestingly it only occurs in the UK so I wonder if it is also linked to pollutants or cleaning chemicals as well??
I have been spearfishing and freediving for 6 or 7 years now (to quite modest depths) and have not experienced any problems at all. In my case I believe freediving has actually helped my asthma. If i feel some wheeziness coming on the first thing I do now is lie down somewhere and do some focused breathing in much the same way as I would for a static breathold (but without the breatholds). This almost always cures the problem.
In the summer I am in the water three or times a week and find i hardly get asthma at all. This is also the case when I can find the motivation to do regular breathold tables.
Of course the severity of my asthma and its triggers may be completelly different to yours but these are my experinces.
Hope this is useful info.
Matt
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