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JKM > Volume 41(1); 2020 > Article
Koo: Study on changes in Ryodoraku test according to carbon monoxide concentration in exhaled breath



The aim of this study was to investigate relationships between Ryodoraku and carbon monoxide concentration during expiration of smokers.
This study was designed as an exploratory observational study. This study was based on the hypothesis that increased levels of carbon monoxide in the smoker’s breath may affect indicators that reflect the respiratory and circulatory systems in the Ryodoraku test.


The participants were 49 people who smoked for over a year. They were examined at least one hour after their last smoking. They were tested in a stable state. When examining carbon monoxide during expiration, they breathed deeply, kept breathing for 20 seconds, and slowly exhaled. The Ryodoraku test was performed on its representative points of twelve meridians. Pearson’s correlation analysis was used to investigate correlation between the concentration of carbon monoxide in the breath and the current in the measurement points.


The higher the carbon monoxide concentration in the exhalation, the significantly greater the current value of Lt H1·both H2·Lt H3·Rt H5, deviation of Lt H1·Lt H2·Lt H3 current value and the laterality between right and left current of H3.


The more cigarette smoked, the more changes in heart, lung, pericardium and triple energizer meridians were observed in the Ryodoraku test. I found that increased carbon monoxide in smokers could affect the results of the Ryodoraku test.

Table 1
Point of Measurement with Ryodoraku
Meridian H1 H2 H3 H4 H5 H6
Organ Lung Pericardium Heart Small Intestine Triple energizer Large Intestine
Acupoint 태연(LU9) 대릉(PC7) 신문(HT7) 양곡(SI5) 양지(TE4) 양계(LI5)

Meridian F1 F2 F3 F4 F5 F6

Organ Spleen Liver Kidney Bladder Gallbladder Stomach
Acupoint 태백(SP3) 태충(LR3) 태계(KI3) 속골(BL65) 구허(GB40) 충양ST42)
Table 2
General Characteristics of Subjects and Carbon Monoxide Levels in Exhalation(N=49)
Variables Categories n(%)
Age 3rd decade 14(28.6)
4th decade 12(24.5)
5th decade 4(8.2)
6th decade 11(22.4)
>60 8(16.3)

Carbon Monoxide in Exhalation (ppm) 0–5 13(26.5)
6–10 12(25.5)
11–15 14(28.6)
16–20 5(8.2)
20–37 5(8.2)
Table 3
Pearson’s correlation coefficient
CO (ppm) Correlation coefficient 0.339*
p-value 0.017
N 49

* p < 0.05

Table 4
Pearson’s correlation coefficient
CH1 (Lt) DH1(Lt)
CO (ppm) Correlation coefficient 0.375** 0.361*
p-value 0.008 0.011
N 49 49

* p < 0.05

CH1 means current value on representative point of H1 ryodoraku

DH1 means current deviation on representative point of H1 ryodoraku

Table 5
Pearson’s correlation coefficient
CH2 (Rt) CH2 (Lt) DH2 (Lt)
CO (ppm) Correlation coefficient 0.359* 0.390** 0.388**
p-value 0.011 0.006 0.006
N 49 49 49

** p < 0.01

CH2 means current value on representative point of H2 ryodoraku

DH2 means current deviation on representative point from current average of H2 ryodoraku

Table 6
Pearson’s correlation coefficient
LH3 CH3 (Lt) DH3 (Lt)
CO (ppm) Correlation coefficient 0.396** 0.372** 0.331*
p-value 0.005 0.009 0.020
N 49 49 49

* p < 0.05

** p < 0.01

LH3 means current laterality of Lt and Rt H3 rhodoraku

CH3 means current value on representative point of H3 ryodoraku

DH3 means current deviation on representative point from current average of H3 ryodoraku

Table 7
Pearson’s correlation coefficient
CH5 (Rt)
CO (ppm) Correlation coefficient 0.282*
p-value 0.050
N 49

* p < 0.05

CH5 means current value on representative point of H5 ryodoraku


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