The formula for this hormone is C9H13NO3; can you feel it speeding up your heartbeat?
..... A number of formulas are used to estimate HRmax
... [DOC] [TLE] Breathing and Heart Rate Control - Universal Nutrition [PAR] If you ever learned to play a wind instrument, then you probably know how to ... 
And although breathing is normally involuntary, an act of will can slow it down or 
speed it up; make it long and diaphragmatic, ... Exhale and feel the sensation 
again.