[QUOTE=Avatar186;78471]Pranayama and hyper/hypo ventilation.
Co2=carbondioxide
o2=oxygen
Carbondioxide controls breathing.
Higher co2 in the blood = more breathing.
Lower co2 in the blood = less breathing.
Breathing incorporates many angles.
Shallow.deep.
slow.fast.
consistant.inconsistent
rhythmical.unrhythmical
Ratio.
Breathing through the nose. Hyperventilation
can be had by consistant rhythmical breathing. This means eliminating the natural pause that occurred at the beggining and end of the breath.
Hyper and hypo are a thin line. The difference between the two lays in ratio between inspiration and expiration. The average human hypo ventilates naturally. 
Comments before I explain more? =][/QUOTE]
In my experience On the surface it seems like breathing in a specific way controls the levels of Co2 in the blood this is a provable scientific fact using external means.
I have observed however that once energy flows in the Sushumna from the Medulla and the Chakras are humming and energy is cascading that the breathless state occurs on its own in other words the need for breathing stops.
Here is a fascinating thing most people are not aware of the Vegas Nerve originates in the Medulla Oblongata and is responsible for many things from blood pressure to breathing.
http://www.becomehealthynow.com/popups/medulla1.htm
Does this look familiar in any way can we say Chakras anyone?
http://www.becomehealthynow.com/popups/parasympathetic.htm
And finally the best description I have read of this master nerve.
http://www.kimayahealthcare.com/OrganDetail.aspx?AboutID=1&OrganID=324&FromEntryPointID=5&FromLinkID=66
The human organisim can lift cars off of babies and do many other incredible things we can hardly believe. Is it then contradictory to believe in the spiritual practices?
No not at all simply put as above so below we are not just making ourselves feel good by stimulating the vegas nerve.
I submit that there is an interface between meat and spirit that enlivens the human animal and it is in the Medulla Oblongata.
A person can argue belief all day long but stimulating the nerves of a corpse with electricity ,feeding a corpse or pumping air into it’s lungs does not make the person that resided in that meat suit sit up and start interacting through that dead body again.
So this brings me full circle Pranayama starts when the breath stops yet breathing methods are initially needed to get there but before you enter the doorway the shoes come off.
The shoes are the lungs breathing.
When the energy has run it’s course then you begin breathing again but not in a way that leaves you gasping for air, that only happens if you ignore the bodies desire to breath when the energy is no longer directly supplying the body.
Furthermore the body has to become accustomed to experiencing tremendous amounts of current. The current will not burn you out as some like to dramatize there are safeguards in place for that.
The system has its own fuses as it were and will prevent it. In fact when you experience very strongly the bodies reaction is usually to make you sleep during which time it grows and adapts to the currents and becomes even better at living off of these currents in states of sadhana.
I am not an expert in anything these are the things I have observed through experience and have drawn my conclusions from.
Now OP lets here some more about this method of yours that leads to what I have described I am certain many would like to know of it, including myself
Thanks.