Oxygen production? You mean oxygen absorption, i.e. oxygen is not produced by the body but taken in via the breath. Thus if you improve your breathing technique you could increase your oxygen absorption efficiency.
If you can hold your breath less a minute like 45 seconds or >30 seconds that would be reasonably good other than to improve to the very good time of >60 seconds.
Note I stated above, the ability to hold one’s breath for a period of time up to 60 seconds or more is primary due to carbon dioxide than the need for oxygen.
It is the carbon dioxide build up that is detected which triggers the desperation and strong impulse to breathe so that one do not end up with an emergency due to lack of oxygen 4 minutes or more later.
Within the respiratory system there is a carbon dioxide level detector [CDLD] which has a range of degrees of sensitivity due to various reasons and causes which could allergy, diseases, basic well being, mental states, etc.
The sensitivity of this carbon dioxide level detector which has an effect on one’s level of spirituality in various ways.
This CDLD detector if very sensitive can trigger very convulsive impulses from the gut, the flight and fight response, the adrenal gland, various serious anxieties, fears, which are all anti-thetic to one’s spiritual and well being level.
Thus the training of the sensitivity of the CDLD will enable one to increase the time one can hold one’s breath and in this case, the level of spirituality.
One positive of this is the longer time also allow more oxygen to be processed by the aveola of the lungs into the blood system.
If your problem is asthma or other allergies, then this is very likely to be resolved with effective breathing techniques to control the CDLD sensitivity which normally caused hyperventilation, panic and anxieties. There are many research to support this.
The length of time one can hold one’s breath is strongly correlated with carbon dioxide sensitivity whilst oxygen requirement is a secondary issue in this issue.