Hmm - did you miss Physiology 101 Mikey? Inspiration (lay term is inhalation) normally involves muscle action, Expiration is normally a passive=muscle relaxation phase. High output physiology is different, though, involving more voluntary muscle contraction in intercostals, etc. Perhaps you mean to say to limit your energy output on inspiration more than expiration - something I don't know much about, but Eddy B's book would probably support this proposition, along with the previously mentioned 'belly breathing'. Still, there is no air movement into the lungs by atmospheric pressure alone: the pressure differential is always a result of either muscle contraction, or muscle elasticity of the diaphragm during expiration only.Mike T. said:Sorry, I couldn't resist. Let atmospheric pressure fill the lungs not muscle energy. Just exhale forcefully and let nature do the rest.
When climbing I try to breath in rhythm to the pedal strokes -
"Out 1-2-3. In 1-2. Out 1-2-3. In 1-2".
I gives you something to concentrate on.