When feeling the pulse, sound persons’ pulse is the criterion for diagnosis whether you are a sick person. Sound person is defined as one who is harmonious and not sick in sympathy with natural order. Among the factors for being sound persons, breathing and pulsation, Chongu(寸口) and Inyeong(人迎) are most closely connected with the representative methods of feeling the pulse which are used currently.
According to 『Hwangjenaegyeong(黃帝內經)』 on breathing and pulsation, the pulse beats twice per a breathing-in and a breathing-out each. And for a specific breathing, it beats 5 times including the remnant with a big breath. That the pulse beats twice means that it beats not only twice, but also regularly and repeatedly. The remnant is related to the meaning on a leap month, 5-time beating during a breath is connected with the contents of Osipyeong(五十營). A human is not always in stable and sticks to balance continuously with changes under the circumstances. So when it comes to a criterion how to measure the pulsation frequency, breathing is much more reasonable than pulsation and breathing calculated for a minute.
According to 『Hwangjenaegyeong(黃帝內經)』, sound person is the person of whose Chongu and Inyeong are in order and much the same in response to each other. Although there is a minor difference in the meaning of term between Chongu and Gigu(氣口), Maekgu(脈口) in originally, it is used as almost same meaning when Chongu is used in opposition to Inyeong. Afterwards, depending on medical men, around neck or Chongu of the left hand are measured for Inyeong. However, Inyeong described in 『Naegyeong(內經)』 is Jokyangmyeong(足陽明) and it means the Hyeol(穴) around neck where the pulse beats, it looks like about the carotid area. In addition, the pulse and the four seasons meet each other and Inyeong is a little stronger in spring·summer and Chongu is a little stronger in fall·winter.