Difference of EEG in Methods of Qigong Practice and in Length of the Training Period

EEGs were measured to study the differences in the various methods of Qigong and in the length of the Qigong training period. The experiments were performed during an internal Qigong (Zhan-zhung-gong) and an external Qigong (Kong-jin-gong) by Qigong masters and during an internal Qigong (Zhen-qi-yun-xing-fa) by four trainees, whose training periods were from 17 months to 3 years. During the external Qigong, alpha waves on the occipital region decreased on the masters but increased on the Qi-receivers, and they also increased on the trainees during the quiet internal Qigong. A ratio of the effective amplitude of the alpha waves on the frontal to the occipital regions was calculated. The ratios of masters were larger, especially during Zhan-zhung-gong, ie. the frontal alpha waves were larger than the occipital ones. On the trainees, the longer their training periods were, the larger the ratio tended to be. The frequency of the alpha waves became faster during the external Qigong and slower during the quiet Qigong. On the subjects whose alpha waves became much slower, theta waves appeared around the frontal-midline position, Fz.