Author: Song Kongzhi//Zhi Tingxian//Zhou Liangzhong//Yan Xiaoxia
Affiliation: Institute of Space Medico-Engineering, Beijing 100094, China 
Conference/Journal: 2nd World Conf Acad Exch Med Qigong
Date published: 1993
Other: Pages: 68 , Word Count: 489
Song Kongzhi, Zhai Tingxian, Zhou Liangzhong, Yan Xiaoxia
lnstitute of Space Medico-Engineering, Beijing 100094, China
Ninety-six students in the Qigong College were taken as subjects. They have practiced qigong exercises for 2—3 years. It was the qigong group. The control group consisted of fifteen young men who had not practiced qigong exercises. Skin resistance and skin microvibration signals at Yintang (Extra), Shanzhong (Ren 17), Qihai (Ren 6) and right Laogong (P 8) were simultaneously and continuously measured before and under the qigong state. Subjects were sitting quietly with eyes closed for 10 min before qigong exercises, then their mind should be concentrated on their own Qihai (Ren 6) for 10 min, then on their right Laogong (P 8) for 3 min. The control test was similar to the qigong test. The change values (%/min) of the skin resistance at the main points (on which subjects' mind should be concentrated) decreased, showing excitation, while that of the rest points (on which subjects' mind should not be concentrated) increased or changed little, showing relative inhibition under the qigong state, when the qigong group was compared with the control group. The difference between the main points and other points of the qigong group and control group were significant statistically. The results showed that integral excitation was up under the qigong state through the following ways main points excited, other points inhibited, main points excited, other points also excited , but the value of excitation of the main points was higher than that of the other points; main points inhibited , other points also inhibited, but the value of inhibition of the other points was higher than the main points, then the main points were still excited in contrast to the other points. Under mind concentration, integral physiological changes were that dominance in the main points caves (relative to other points) was developed in dynamic process. It may be called as the 'dynamic dominant law'.
Skin microvibration is a low frequency muscular vibration. It was different from pulse wave. The main peak of microvibration wave was seen significantly at above 3 Hz on frequency spectral analysis graph. The results showed that the percentage of microvibration present was 49±6.1(%) in the qigong group and 16.7±8.3 (%) in the control group. the difference between them was significant statistically. The amplitudes of microvibration waves on the main points increased. while that on other points decreased or changed slightly. It showed that there was dynamic dominance on the main points relatively.
Microvibration and infrasonic sound on Laogong (P 8) were measured simultaneously in a sound insulated room. It was seen clearly that infrasonic sound signals were different from interference signals on frequency spectral graph. It was found that the percentage of infrasonic sound present was 78.1% in the qigong group, while that of the control group was 40.0%. The positive medium relation between the infrasonic sound and microvibration was part sound resource of the external body infrasonic sound. Under the qigong state. amplitudes of the infrasonic sound increased significantly, and there were also dynamic dominant characteristics.