[Andy Reed]

Typically with MAF there is an adjustment based on health or medications, so I would definitely make a subtraction; by how much though is anybody’s guess, but a minimum of 5. Nasal breathing is another good option here, especially in the aerobically fit, which it sounds like you are, so I’d guesstimate that your true value (on beta blockers) lies somewhere between 125 and 140. Without more detailed testing though, it is hard to know, and as I say, a high volume of easy training is never a bad idea!