Ten healthy adults lying in the supine position underwent ‘painless sohri-kifu technique’, ‘Oshide only’, ‘acupuncture only’ and ‘painfull sohri-kifu technique’ on the left ‘Tai-en’ point for one minute. Instantaneous heart rate was measured with a polygraph. Statistical analysis showed that ‘sohri-kifu technique’ and it's constituent—‘Oshide only’, and ‘acupuncture only’ caused significant the decrease of heart rate. The painless sori-kifu technique was more effective than ‘Oshide only’ and ‘acupuncture only’ in decreasing the heart rate. The ‘painful sori-kifu technique’ caused no significant change of heart rate. Sticking pain seems to effective in suppressing the decrease of heart rate.

Comparative trials were undertaken using 16 types of guide-tubes of different caliber and external diamter: small caliber (1.35mm) and large cliber (1.80mm) tubes of eight types of external diameter (i. e, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5 and 6.0mm). 540 tappings was performed with a hard needle (length: 58.0mm, diameter: 0.16mm, head diameter: 1.25mm).
The result can be summarized as follows:
1. Among the six small guide-tubes with 2.5-5.0mm external diameter, the larger external diameter was, the less sticking pain was experienced.
2. The four small caliber guide-tubes with 4.5-6.0mm external diameter caused significantly less sticking pain compared with the four small caliber guide-tubes of 2.5-4.0mm and the four large guide-tubes of 4.5-6.0mm.