KR20050071841A - Apparatus and method for measuring segmental body fat using bioelectrical impedance - Google Patents

Abstract

The present invention relates to a site-specific bioelectrical impedance body fat analyzer, and more particularly, to measure the body circumference separately, and to use the measured circumference for calculation to measure body fat for each body region more precisely, the body bioelectric body fat It relates to a measuring instrument.

The bioelectrical impedance measuring instrument of the present invention selects an impedance measuring circuit (19) consisting of a current electrode and a voltage electrode (31 to 38) in contact with a subject's hands and feet, a current applying circuit and a voltage measuring circuit, and a measurement target part of the body. An electronic switch 18 for inputting information, an input unit 12 for inputting information such as gender, age, and body measurement data of a subject, a display unit for displaying a measurement state and a result, a weight measurement unit 16 for measuring weight, and an operation and control function In the body fat measurement device using a bioelectrical impedance consisting of a central control unit 22 for performing a, a tape measure for measuring the circumference at any one or more of the body parts; and the measured circumference further the central control unit 22 And an output unit configured to output a body fat amount for each body part calculated using the circumference value.

Description

Apparatus and Method for Measuring Segmental Body Fat Using Bioelectrical Impedance

The present invention relates to a site-specific bioelectrical impedance body fat analyzer, and more particularly, to measure the circumference of body parts separately, and to use the measured circumference for calculation to measure body fat for each body part more precisely the bioelectric body fat body fat meter It is about.

The bioelectrical impedance method is based on the fact that current flows through moisture in the human body. Fat-fat contains approximately 73% of moisture, which is an electrical conductor. Assuming that the volume V of the conductor through which the current passes is constant in cross section, the length L and impedance Z of the conductor have the following relationship.

V ∝ L ² / Z (Ⅰ)

Therefore, the lean body mass (FFM) containing a certain ratio of water can be expressed by the following equation according to the height (H _O ) and bioimpedance (Z).

FFM ∝ H _O ² / Z (Ⅱ)

According to this principle, the lean body mass of the subject can be calculated by measuring the height of the subject and measuring the electrical resistance, that is, the impedance to the whole body. The water content in the body can be measured in the same way because it maintains a constant ratio with the lean body mass, and the muscle mass is also related to the lean body mass can be measured on the same principle.

Fats, on the other hand, contain little moisture and are electrically insulators. Therefore, such fat component is not a component that can be directly measured by the bioelectric impedance method, unlike lean body fat. However, since the sum of the body fat amount and the lean body mass corresponds to the body weight, if the weight is measured and the lean body mass is measured as described above, the amount of body fat can be calculated from the difference between the two values. On the other hand, the measurement by site provides information to determine the level of muscle development of each part of the subject, it is very useful to check the effects of exercise by each part, left and right balance status, upper and lower body development, the effect of rehabilitation treatment. As with the body composition analysis of the whole body, the impedance of each part can be measured to analyze the body parts such as the arms, legs, and torso. Fat loss amount (FFMi) for each site is expressed as follows according to the height and site impedance (Zi).

FFM _i (or muscle mass by site) ∝ H _O ² / Z _i (Ⅲ)

In theory, the actual length of each part should be applied instead of the elongation, but considering the convenience of the measurement, it is not a big difference in accuracy even if it is replaced by the elongation. That is, humans generally have a certain proportion of arms, legs, and torso lengths depending on their height, and commercially available body composition analyzers generally adopt this assumption.

The technique of measuring the impedance of each part includes a method of measuring the impedance between the ends of the human body through a total of eight electrodes by installing two electrodes on both hands and both feet. In general, the impedance values for five parts of the human body are measured by measuring the end-to-end impedance between the hands and hands, feet and feet, left and left feet, right and right feet, left and right feet (diagonal), and right and left feet (diagonal). The method of calculating through simultaneous equations is used.

<Table: Measurement of Impedance by Human Body Part>

Used electrode Measurement area Measure 1 Left hand, right hand Left arm + right arm Measure 2 Left foot, right foot Left leg + right leg Measure 3 Left hand, left foot Left arm + torso + left leg Measure 4 Right hand, right foot Right arm + torso + right leg Measure 5 Left hand, right foot Left arm + torso + right leg Measure 6 Right hand, left foot Right arm + torso + left leg

That is, as shown in the table, five or six impedance measurements are performed between different end portions of a human body including a plurality of sites, and then the impedance values of the five sites are divided and calculated through a simultaneous equation. However, this method has a problem in that the measurement error generated in each measurement is uniformly applied to the trunk portion having a very small impedance value compared to the arms and legs in the solution of the simultaneous equation. The torso is a quantitatively large part of the whole body, and the error in the torso part is a factor that hinders the accuracy of the whole body composition analysis.

The proposer of the present invention has invented a measurement method for each site that can directly measure each site by improving the disadvantages of the conventional method for measuring each site (Korean Patent No. 10-0161602, US Patent US 5,720,296). Figure 1 shows the modeling of the human body according to the above method, which is not to calculate the impedance for each part indirectly through the equation, but to measure the impedance for each part directly at each measurement. In general, the method of measuring impedance flows a current of a known magnitude and measures voltage at a desired area to obtain impedance according to Ohm's law. These devices include electrodes (1 ~ 8), impedance measuring circuits, electronic switches, and amplifiers. It consists of A / D converter and central control unit. In the conventional site-specific measurement, the electrode of the current and the electrode of the voltage are always located at the same end site, but in the proposed method, the arrangement of the electrodes is freely set according to the measurement site.

For example, in order to measure the impedance Z _ra of the right arm, the right hand electrode 1 and the right foot electrode 5 are connected to a current terminal, and the other electrode 2 and the left hand electrode 4 of the right hand are connected to a voltage terminal. Impedance measurement is possible in the area of the right arm where the current flows and the voltage is measured. In order to measure the impedance Z _t of the body, the right hand electrode 1 and the right foot electrode 5 are connected to a current terminal, and the left hand electrode 4 and the left foot electrode 8 are connected to a voltage terminal. In the case of the right leg impedance Z _rl , the right hand electrode 1 and the right foot electrode 5 are connected to the current terminal, and the other electrode 6 and the left foot electrode 8 of the right foot are connected to the voltage terminal. The left arm and the left leg can be measured by changing the impedance measurement and the left and right of the right arm and the right leg, respectively. This method is basically based on the theory that the voltage drop only occurs where the actual current flows. This method of impedance measurement for each part does not occur the propagation of unnecessary errors that occur in the solution of the simultaneous equations, and by directly measuring only the desired part separately, it focuses precisely on the torso part, which is difficult to measure due to respiration, heart rate, etc. can do.

On the other hand, a method for measuring the body composition of the trunk such as abdominal visceral fat or subcutaneous fat is described in Japanese Patent Application No. 99-164633 or Patent Application 99-164634. This is a direct measurement of the circumference of abdominal circumference and abdominal subcutaneous fat to calculate the amount of abdominal visceral fat and subcutaneous subcutaneous fat. The total amount of fat is calculated from the direct measurement of circumference and subcutaneous fat based on the fact that it correlates with visceral fat and total abdominal fat. In other words, the total fat was obtained from the bioimpedance measurement and the abdominal fat area was calculated using the correlation between the abdominal fat area and the total fat amount. Although the above application obtained the distribution of abdominal fat by directly measuring the thickness and circumference of subcutaneous fat in impedance measurement, it does not calculate the body fat distribution for each site only by using the correlation between the abdomen and the total body fat.

On the other hand, in the bioelectric impedance method, the body fat amount obtained by subtracting the lean body mass from the total amount can not be calculated in principle, because the weight of each part can not be calculated individually. However, considering the gender and age, the body size and body size of the subject can be estimated from the weight or height of the subject. Therefore, the approximate body fat amount is estimated by including the empirical and statistical predictions in the impedance measurement for each region. The method is also used. By measuring the impedance of each part, it is possible to confirm the distribution of the internal body type, that is, the fat-free fat of the subject, and the approximate tendency of the subject from the fact that the distribution of body fat according to the total amount of body fat, sex, and age tends to be rough. The distribution of body fat by region can be estimated. However, the statistical predictive value is also not accurate for individual subjects, and thus it is not a case that a large amount of error is included in the measured body fat mass.

The present invention is a method proposed to overcome the inaccuracies and limitations of the above-mentioned body fat mass measurement for each site, an object of the present invention is to measure the body fat mass by site by adding a circumference measurement of the body parts by a tape measure or a circumference meter to the body composition analyzer It is to provide a method to measure the body shape more accurately and by calculating the subcutaneous fat of the body.

Another object of the present invention is to add a method of directly measuring the circumference of a specific part such as the body or legs in measuring the amount of body fat for each part to more precisely measure the distribution of fat per site by the conventional bioimpedance method. .

The present invention has been conceived in that it is possible to predict the overall body fat distribution more precisely by additionally measuring the circumference at a specific site such as the abdomen in the conventional body fat measurement by the impedance method. Since subcutaneous fat is generally distributed like a circumferential fat component, the measurement of circumference predicts the distribution of body fat in each part especially in the parts such as arms and legs and calculates the subcutaneous fat in each part to provide accurate information about the body shape. .

In order to achieve the above object, in one embodiment of the present invention, the impedance measuring circuit 19 consisting of a current electrode and a voltage electrode (31 to 38) in contact with the subject's hands and feet, a current application circuit and a voltage measurement circuit, An electronic switch 18 for selecting a measurement target site of the body, an input unit 12 for inputting information such as a gender age and body measurement data of the subject, a display unit 39 for displaying a measurement state and a result, and a weight for measuring weight In the measuring device 16 and the central control unit 22 for performing arithmetic and control functions to measure the body fat for each body part using a bioelectrical impedance,

A tape measure 40 measuring the circumference at any one or more of the body parts; and a circumference value input unit in which the measured circumference is further input to the central controller 22; and a body fat amount calculated for each body part using the circumference value. It proposes a bioelectrical impedance body fat analyzer for each body part, including an output unit for outputting.

In addition, in one embodiment of the present invention, the body part for measuring the circumference is characterized in that any one or more of the upper arm, leg, abdomen.

In addition, in one embodiment of the present invention, the measurement of the circumference proposes a bioelectrical impedance body fat analyzer, characterized in that the electronic tape measure and the measurement data is automatically input.

In addition, in one embodiment of the present invention, the measurement of the circumference proposes a bioelectrical impedance body fat analyzer, characterized in that using the non-contact laser light interference and the measurement data is automatically input.

In addition, in one embodiment of the present invention, the electronic tape measure proposes a bioelectric impedance body fat analyzer, characterized in that configured to be separated from the body portion of the body fat analyzer.

In addition, according to one embodiment of the present invention, the output unit proposes a bioelectrical impedance body fat measuring device for each body part, characterized in that the output includes the calculated subcutaneous fat for each body part.

The body electric body impedance body fat measuring method according to the present invention includes an impedance measuring circuit (19) consisting of a current electrode and a voltage electrode (31 to 38) in contact with the subject's hands and feet, a current applying circuit and a voltage measuring circuit, An electronic switch 18 for selecting a measurement target site of the body, an input unit 12 for inputting information such as a gender age and body measurement data of the subject, a display unit 39 for displaying a measurement state and a result, and a weight for measuring weight Measuring lean body mass for each body part using a bioelectrical impedance measuring instrument including a measuring unit 16 and a central control unit 22 performing arithmetic and control functions; and

Measuring the circumference in at least one portion of the body part; and

It includes; the step of calculating the circumference in the body part is not measured the circumference.

In addition, the body electric body impedance body fat measurement method for measuring the subcutaneous fat of the present invention, the impedance is composed of a current electrode and voltage electrodes (31 to 38), a current application circuit and a voltage measurement circuit in contact with the subject's hands and feet The measuring circuit 19, an electronic switch 18 for selecting a measurement target site of the body, an input unit 12 for inputting information such as the gender age and body measurement data of the subject, and a display unit 39 for displaying the measurement state and the result. Measuring lean body mass for each body part using a bioelectrical impedance measuring instrument including a weight measuring unit 16 measuring weight and a central controller 22 performing arithmetic and control functions; and

Measuring the circumference in at least one portion of the body part; and

Computing the circumference in the body part is not measured circumference; And

It includes; the step of calculating the subcutaneous fat amount and thickness for each part from the circumference and lean body mass for each part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 shows a schematic configuration diagram of a bioelectric impedance body fat measuring apparatus according to the present invention and Figure 3 shows a specific example of the bioelectric impedance body fat measuring apparatus according to the present invention. Impedance measurement is carried out in the same manner as in the conventional method, an impedance measuring circuit 19 consisting of electrodes 31 to 38 in contact with hands and feet, a current application circuit and a voltage application circuit, and an electronic switch for selecting a measurement target part of the body. ), An input unit 12 through a keypad for inputting information such as gender, age, and body measurement data of the subject, a display unit 39 for displaying a measurement state and a result, a weight measuring unit 16 for measuring weight, and an amplifier 20 23, 24, and an A / D converter 21 and a central control unit 22 that performs arithmetic and control functions. 3 shows a circumferencial scale 40 measuring the circumference at the body 30 and the body part. The tape measure is for calculating the thickness of the subcutaneous fat through the circumference measurement. For the bioimpedance measurement according to the present invention, the subject inputs the subject's information such as gender, age, height, etc. before measuring the impedance. Information that can be measured, such as height, can be automatically entered into a separate measurement tool, such as an ultrasonic extensometer or displacement gauge. In addition, personal information such as gender and age may allow the body composition analyzer to read data of a personal card (not shown) in which the subject's health history is input. Such an input device may be variously modified as needed by those skilled in the art, but it is within the scope of the present invention.

After various input processes are performed, the subject grasps the left hand electrodes 32 and 33 and the right hand electrodes 31 and 34 formed on the handle with both hands, and the right foot electrodes 35 and 36 and the left foot electrodes 37, 38), the load sensor (not shown) in the lower portion of the power pole can measure the load of the subject. Impedance current is measured for impedance measurement and the voltage is measured at the desired area to obtain the impedance according to Ohm's law.The electrodes 31-38, the impedance measurement circuit 19, the electronic switch 18, and the amplifier ( 20, 23 and 24, the A / D converter 21 and the central controller 22. In the conventional site-specific measurement, the electrode of the current and the electrode of the voltage are always located in the same site, but in the proposed method, the arrangement of the electrodes is freely set according to the measurement site. By directly measuring only the desired area, the error caused by the existing simultaneous equations is reduced as described above.

Meanwhile, a method of measuring the circumference of a body part using a tape measure is a method in which a measurer measures the circumference at a specific part of a subject as shown in FIG. 3. Since this is a method of measuring the perimeter directly, the perimeter at the measurement site can be known accurately. A manual tape measure can be used to measure the circumference. However, the circumference value is measured by measuring the circumference using an optical sensor or an encoder as disclosed in JP-A-2003-21812 and JP-A-1999-37565. An electronic tape measure converted to an electrical signal can be used. The body fat distribution of each part is measured by inputting the measured value by the electronic tape measure to the body composition analyzer manually or automatically. The input unit for inputting the measured circumference to the central control unit is inputted to the body composition analyzer through an input device such as a keypad, or automatically by connecting an electronic tape measure directly to the body composition analyzer through the connection terminal 42 as shown in FIG. Measurements can be sent to the central control unit.

In addition, the measurement of the circumference is made by a non-contact laser optical interference method. The non-contact laser optical interference measuring device is widely known as a technique for measuring coordinates of a body shape or a three-dimensional object as a three-dimensional laser scanning device, which is disclosed in US Patent Publication No. 4737032 or Japanese Patent Application Laid-Open No. 3-194414. As shown in FIG. 4, the beam to be irradiated to the measuring object or the human body and reflected from the surface portion of the measuring object is reflected through the reflectors 61 and 62 and reflected from the mirror. Is used to measure the coordinates of the three-dimensional surface by using the interference phenomenon from the transmission reflector (63). Since the body shape measurement is a well-known technique, details thereof are omitted in the present invention, but the circumference value of the body part obtained from the three-dimensional body shape measurement can be used in the present invention.

In addition, the electronic tape measure is preferably formed to be separated from the main body by configuring a connection terminal on one side of the main body 30 of the bioelectric impedance body fat analyzer. The connection terminal 42 for the transmission of the circumferential measurement may be separately configured on one side of the main body as described above, but may be transmitted through various connection ports such as an existing printer connection port (Parallel; IEEE1284), RS232C, and USB. It is also possible.

The amount of water (TBW) contained in the whole body is the sum of the amounts of water for each part, and is represented by the following formula (IV).

TBW = a ₁ H _o ² / Z _ra + a ₂ H _o ² / Z _la + a ₃ H _o ² / Z _t + a ₄ H _o ² / Z _ra + a ₅ H _o ² / Z _la (Ⅳ)

Where ra is the right arm, la is the left arm, t is the torso, rl is the right leg, ll is the left leg, and a ₁ , a ₂ , a ₃ , a ₄ , a ₅ satisfies Eq. (IV) Constant is determined by regression analysis. Equation (IV) is incorporated in the central control unit 22 as a program. Since body fat has very low moisture content among the constituents of the human body, the amount of water present in body fat is ignored and the fat-free component contains about 73% water, so the lean body mass (FFM) can be divided by 0.73 from the amount of water. .

To calculate Segmental Lean Mass (SLM), use the following formula.

SLM _ra = b _1ra × Z _ra + b _2ra × W _o + b _3ra × H _o + b _4ra

_{SLM la = b 1la × Z la} + b 2la × W o + b 3la × H o + b 4la

SLM _t = b _1t × Z _t + b _2t × W _o + b _3t × H _o + b _4t (Ⅴ)

_Rl = b × Z _{1rl rl} SLM + b _2rl × W × H _o + b _o + b _{3rl 4rl}

_{SLM ll = b 1ll × Z ll} + b 2ll × W o + b 3ll × H o + b 4ll

W _o is the weight.

In the above formula (V), constant values of b _1i to b _4i (where i denotes a body part and ra, la, t, rl or ll) are DEXA (Dual energy x-ray absorptiometry), etc. in many subjects. Using the device with the measurement function for each part, the value that satisfies the reference value is obtained using the regression model. The completed formula is embedded in the central control unit.

When the muscle mass for each site is obtained, the circumference of the site muscle is calculated based on the cylindrical model of FIG. That is, FIG. 5 uses the anatomical basis that the subcutaneous fat surrounds the outside of the cylindrical muscle as a cylindrical model of each body part. Partial muscle mass (V _i ) is expressed by the following equation.

(Ⅵ)

Where L _i is the length of each body part. In the cylindrical model, when the circumference of the internal muscle is CI _i (inner circumference), the volume of muscle mass (V _i ) is expressed by the following equation.

(Ⅶ)

Therefore, muscle circumference by region (CI _i ) is as follows.

(Ⅷ)

By assuming that the body parts are not accurate cylinders and the length of each part is proportional to the height, the muscle circumference for each part can be obtained as follows.

(Ⅸ)

Meanwhile, the body fat mass per region (SFM _i ) is as follows.

(Ⅹ)

Where CO _i is the circumference of the body part. Assuming that the distribution of fat is uniform for each site and the length is proportional to height,

(Vii)

The correction constants d _1i and d _2i are corrected by the body fat amount of each part through a device such as DEXA.

The sum of SFM _i obtained by each site and the body fat mass of the head equals the total body fat mass. It is common to assume that the head has a certain amount of body fat.

Even in areas without circumference, the sum of SFM _i is the total body fat mass. When the distribution of fat in the human body is divided into three parts of the arm, leg, and torso, the value of the two parts is measured with a tape measure. The rest is obtained by excluding the measurement part from the total amount. In addition, when one part is measured, the remaining two parts should be divided into empirical variables. In this case, you know the amount of fat in one part, so you can predict it with higher precision than if you did not measure it using a tape measure.

In this way, when the amount of body fat is calculated for each part, the subcutaneous fat thickness (SF _i ; skin fold) for each part can be calculated from the following equation.

(XII)

 Looking at the above measurement process, by measuring the circumference of the muscle using the impedance method and by measuring the circumference of a part of the body part it is possible to accurately calculate the amount of fat for each body part.

The measurement of the circumference may be performed in one or more places such as the upper arm, the thigh, the chest, and the abdomen.

6 is a flowchart illustrating a method of measuring body fat impedance by body according to the present invention, which includes measuring a lean body fat amount per body part using a body bioimpedance meter (S100); and any one of body parts. It includes a step (S110) for measuring the circumference at the portion or more; and the step of calculating the circumference from the lean body mass in the body portion where the circumference is not measured (S120). The method may include an output step (S130) of the body fat measurement value for each body part as necessary. As described above, the bioelectrical impedance measuring device is based on the body fat measuring device for each part shown in FIG. In addition, by measuring the circumference directly using a tape measure, the body fat amount of each part can be obtained by using the point that the sum of the body fat amount of each part is the total body fat amount in the body parts where the circumference is not measured. That is, the site | part where a circumference was not measured is calculated | required by excluding a measurement site | part from fat total amount.

7 is a flowchart illustrating a method for measuring subcutaneous fat and thickness for each part using the bioelectrical impedance body fat measuring method according to the present invention, which measures the amount of lean body fat per body part using a bioelectrical impedance measuring instrument (S200). And measuring the circumference at any one or more parts of the body part (S210); and calculating the circumference at the body part where the circumference is not measured (S220); and calculating the subcutaneous fat and thickness for each body part ( S240); may include. As described above, the bioelectrical impedance measuring device is based on the body fat measuring device for each part shown in FIG. In addition, the circumference is measured directly using a tape measure, and the area not measured with a tape measure is obtained by excluding the measurement site from the total amount of fat. Finally, the subcutaneous fat for each body part can be calculated using the above equation (XII).

As described above, the present invention exhibits the effect of determining the amount of fat for each part from the measurement of the impedance of each part and the measurement of the perimeter of each part, and provides a method for predicting the remaining parts even if the perimeter is not measured in the whole part.

According to the present invention, it is possible to determine the body shape by accurately calculating the subcutaneous fat amount of each body part by knowing the impedance measurement of each part and the body fat amount of each part.

As described above, the simple modification of the present invention, the variation of the method of transmitting the measurement value of the tape measure, the modification of the installation and storage of the tape measure and the variation of the bioimpedance measurement method of each site in the bioelectric impedance body fat analyzer for each site are described. It will be apparent to those skilled in the art to which the invention pertains, and such changes and modifications are limited by the appended claims.

1 is a view showing the electrode contact position and the impedance model of the human body of the general human component measuring apparatus.

Figure 2 is a schematic diagram of the electrical circuit configuration of the human body composition measuring apparatus according to the present invention.

3 is a view showing a specific example of the site-specific bioelectric impedance body fat analyzer according to the present invention.

4 is a diagram illustrating a configuration of measuring a body circumference by a non-contact optical interference method.

5 is a model diagram showing body water and body fat of a part of the body.

6 is a flowchart of a method for measuring body bioelectric impedance body fat according to the present invention.

7 is a flowchart illustrating a method for measuring subcutaneous fat and thickness for each part using the bioelectrical impedance body fat measuring method according to the present invention.

<Explanation of symbols for the main parts of the drawings>

11 output unit 12 keypad

16: weight measuring unit 18: switch

19: impedance measuring unit 20, 23, 24: amplifier

21: A / D Converter

22: central control unit 30: main body of impedance measuring instrument 31 ~ 38: electrode 39: display unit

40: electronic tape measure 42: electronic tape measure terminal

50: subcutaneous fat of the local area 51: fat removal of the local site

Claims (10)

Current and voltage electrodes 31 to 38 in contact with the hands and feet of the subject, an impedance measuring circuit 19 composed of a current applying circuit and a voltage measuring circuit, an electronic switch 18 for selecting a measurement target part of the body, and the subject An input unit 12 for inputting information such as gender, age, and body measurement data, a display unit 39 for displaying measurement status and results, a weight measuring unit 16 for measuring weight, and a central control unit for performing calculation and control function ( 22) is a measuring device for measuring the body fat by body parts using a bioelectrical impedance, A tape measure 40 measuring a circumference at any one or more of the body parts; and a circumference value input unit in which the measured circumference is further input to the central controller; and outputting a body fat amount calculated for each body part using the circumference value. Bio-electrical impedance body fat analyzer for each body part, including an output unit The method according to claim 1, Body part for measuring the circumference is bio-impedance body fat measuring device for each body part, characterized in that any one or more of the upper arm, leg, abdomen The method according to claim 1, The measurement of the circumference is a bioelectrical impedance body fat meter for each body part, characterized in that the electronic tape measure and the measurement data is automatically input The method according to claim 1, The measurement of the circumference uses a non-contact laser light interference and the measurement data is automatically input bio-impedance body fat meter for each body part, characterized in that The method according to claim 3, The electronic tape measure body fat impedance of each body part, characterized in that the electronic tape measure is configured to be separated from the body portion of the body fat analyzer The method according to claim 1, The bio-electric impedance body fat measuring device for each body part, characterized in that the output includes the calculated subcutaneous fat for each body part Current and voltage electrodes 31 to 38 in contact with the hands and feet of the subject, an impedance measuring circuit 19 composed of a current applying circuit and a voltage measuring circuit, an electronic switch 18 for selecting a measurement target part of the body, and the subject An input unit 12 for inputting information such as gender, age, and body measurement data, a display unit 39 for displaying measurement status and results, a weight measuring unit 16 for measuring weight, and a central control unit for performing calculation and control function ( Measuring lean body mass for each body part using a bioelectrical impedance measuring instrument (22); and Measuring the circumference at any one or more parts of the body (S110); And Comprising a step of calculating the circumference in the body portion is not measured circumference (S120); bioelectrical impedance body fat measurement method for each body part, comprising a The method according to claim 7, The body part for measuring the circumference is bioelectric impedance body fat measurement method for each body part, characterized in that any one or more of the upper arm, leg, abdomen The method according to claim 7, The measurement of the circumference is a bioelectric impedance body fat measurement method for each body part, characterized in that the electronic tape measure and the measurement data is automatically input Current and voltage electrodes 31 to 38 in contact with the hands and feet of the subject, an impedance measuring circuit 19 composed of a current applying circuit and a voltage measuring circuit, an electronic switch 18 for selecting a measurement target part of the body, and the subject An input unit 12 for inputting information such as gender, age, and body measurement data, a display unit 39 for displaying measurement status and results, a weight measuring unit 16 for measuring weight, and a central control unit for performing calculation and control function ( Measuring lean body mass per body part using a bioelectrical impedance measuring instrument (22); and Measuring the circumference at any one or more parts of the body (S210); And Computing the circumference at the body portion where the circumference is not measured (S220); And Comprising a step of calculating the subcutaneous fat and thickness for each part from the circumference and lean body mass per part (S240);