Originally Posted by
gregf83
This will never work for cycling unless you are always pedaling with a constant effort. Your O2 consumption (and hence breathing rate) varies with power output not cadence.
When I run, usually on pretty flat courses, I have a breathing pattern that's in time with my cadence. On the bike, I'll often catch myself breathing in sync with my pedal stroke...usually when I realize I'm not breathing nearly fast enough and hurting my performance. Many times I've told myself "just breath!".