Join Date: Jun 2009
Bikes: Reynolds 531P road bike, Rocky Mountain Metropolis, Rocky Mountain Sherpa 10, Look 566
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My swim coach (he's also a triathlon coach) suggests breathing through the nose for as long as possible to determine anaerobic threshold. Whatever heart rate you get to when you have to switch to using your mouth, that's your personal anaerobic threshold rate, more or less. Obviously this only works if you don't have sinus or nose cartilage problems, but it's close enough for most people. Anaerobic threshold is about 70-85% of max. heart rate for most people, and tends to vary for each type of exercise, i.e. a bit higher for running, lower for cycling, lower still for swimming (where obviously you can only test how long you exhale through the nose.)
If you stay just below anaerobic threshold pace by doing nasal breathing you should be safe in hot weather. It does take a bit of practice to breath only with the nose, I needed to use those adhesive strips that hold the nostrils open when I first tried it.
I highly recommend Joe Friel's book: Total Heart Rate Training as a guide.
Last edited by Rhodabike; 06-30-09 at 08:45 AM.