Abstract
Biophysical measurements during the practice of Zen and Qi-gong were performed. Results obtained by the single square voltage pulse method showed parasympathetic nervous system was dominant during Zen as indicated by the drop in after polarization current parameter in the digestion organ-related meridian spots. During Qi-gong the sympathetic nerve was excited, except for Tantou, which is known as standing Zen. Both cases showed increased blood pressure which may be related to breathing for control of mind and body. The features of oxygen metabolism differed according to the various methods or types of Zen and Qi-gong.