Timing matters: respiratory muscles consume 37% of VO2max increase for first few days after altitude training:

The science of altitude training remains surprisingly murky (as I've written about before ), but new studies continue to answer questions -- and pose new ones. The latest study comes from Robert Chapman's Indiana University group, and it offers an unexpected conclusion: when you return from a stint of altitude training, you'll have a changed breathing pattern that partly counteracts any gains you've made in your ability to deliver more oxygen to your working muscles. It makes sense that, when you go to altitude, your body responds by breathing more frequently and/or more deeply to get more oxygen in. The problem is that, when you return to sea level, you maintain that elevated ventilation, which requires your breathing muscles to work harder than they would normally. In the new study of seven elite distance runners, published in the European Journal of Applied Physiology ,...

Full article: http://sweatscience.runnersworld.com/2012/08/altitude-tra...

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