. Discussion:
According to the results of the three new testing methods, together with the experimental observation of the various biophysical phenomena in the past, we think that the mechanism of the curative effect of qigong in treating bronchial asthma and chronic bronchitis may be explained as follows:
( l ) Qigong can regulate the function of cerebral cortex and vegetative nerve system.
(2) Qigong can improve the function of respiration.
(3) Qigong can regulate qi and blood, ying and yang of the human body.
The X-ray video recording of diaphragm movement, TcPO[sub 2] test and P. P. F. test provide further evidence for the last two hypothesized mechanisms.