On the other hand, your reference to the Dong research project was very imformative and certainly very interesting. I think I will play with the blood pressure cuff a little and do a mini study here at home to compare resting BP, belly breathing and reverse breathing and see what I find.
forgot to ask that when you play with this, don't forget to monitor heart rate. the Dong study didn't mention anything about heart rate. i would be interested in know if there is a change in heart rate or not. my guess is that the heart rate increases, because of the low oxygen intake and higher CO2 in your blood, where your body defensive mechanism is to increase heart rate to circulate blood faster in order to get more oxygen and expel CO2. that's just a guess. but don't do this if you have previous heart condition or high blood pressure.