CN113854998A - Human body composition analyzer and method based on human body shape - Google Patents
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Abstract
Translated fromChinese
Description
Technical Field
The invention relates to the technical field of human body composition detection, in particular to a human body composition analyzer and a human body composition analysis method based on human body morphology.
Background
The bioelectrical impedance technology is a detection technology which extracts resistance information of a hand body by a certain means to reflect biomedical information related to physiology and pathology of an organism. The human body component analysis is an important application branch of the bioelectrical impedance technology, and parameters of components of a human body are obtained through detected impedance information.
The main products on the market are based on multi-frequency, especially 6-frequency 8-electrode 5-segment simulation application. As shown in fig. 1, alternating current signals with various frequencies are applied through excitation electrodes between different limbs, then voltage acquisition measurement is carried out by using measurement electrodes, and the equivalent impedance of each section of the body is analyzed and calculated; then, the height, weight, age and sex of the measured person are combined, and the components of the human body are estimated by using a formula obtained by big data standard modeling. For example, the Wang Jing Zhen research clerk at the Chinese disease prevention and control center nutritional and food safety institute establishes a body composition calculation equation suitable for the characteristics of obese people in China by using multivariate linear stepwise regression and an analysis of variance method.
However, there is a problem with either equation, which is if the equation is adaptive to the population. For example, are impedance, height, weight, age, sex the same for two different people, are their compositions the same? The answer is negative.
Disclosure of Invention
The invention aims to overcome one or more defects in the prior art and provides a human body composition analyzer and a human body composition analysis method based on human body morphology.
The purpose of the invention is realized by the following technical scheme: human body composition analyzer based on human body morphology includes:
the height measuring device is used for measuring the height of the measured person;
the multi-frequency impedance measuring device is used for detecting the impedance of each frequency band of a detected person;
the first camera is used for acquiring a front image of a detected person;
the second camera is used for acquiring a side image of the person to be detected;
and the computer is used for calculating the length of four limbs of the person to be detected according to the front image and the side image of the person to be detected, calculating the sectional area of the trunk of the person to be detected according to the front image and the side image of the person to be detected, and calculating the body composition of the person to be detected according to the impedance, the height, the weight, the age, the sex, the length of the four limbs, the sectional area of the four limbs and the sectional area of the trunk of the person to be detected in each frequency band.
Preferably, the formula for calculating the weight of the extracellular fluid of the tested person is as follows:
wherein ECW represents the weight of the extracellular fluid; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a ismnIs an empirical coefficient for the calculation of the weight of the extracellular fluid, wherein am0Denotes the overall empirical factor, a, used for the calculation of the weight of the extracellular fluidm7Represents the empirical factor of sex, a, used in the calculation of the weight of the extracellular fluidm8Represents an empirical age coefficient, a, for the calculation of the weight of the extracellular fluidm9Denotes the empirical factor of body weight, a, for the calculation of the weight of the extracellular fluid10The empirical coefficient of cross-sectional area used for the calculation of the weight of the extracellular fluid is shown, and W represents the body weight.
Preferably, the calculation formula of the total human body moisture of the detected person is as follows:
in the formula, TBWmRepresents the total moisture of the human body; sex represents gender, male 1, female 0; m represents a body part, m represents a left arm when taking 1, m represents a right arm when taking 2, m represents a left leg when taking 3, m represents a right leg when taking 4, and m represents 5Representing the torso; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a'mnIs an empirical coefficient calculated for the total moisture of the human body, wherein, a'm0Represents a total empirical coefficient, a ', for calculation of total body moisture'm7Represents a gender empirical coefficient, a 'for calculation of total human body moisture'm8Represents an empirical age coefficient, a 'for calculation of total body water'm9Represents a body weight empirical coefficient, a ', for calculation of total body water content'10The empirical coefficient of cross-sectional area used for calculation of total body water is shown, and W represents body weight.
Preferably, the formula for calculating the lean body mass of the person to be measured is as follows:
in the formula, FFMmRepresenting lean body mass; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a "mnEmpirical coefficients for calculation of lean body mass, wherein, a "m0Representing the overall empirical coefficient for lean body mass calculation, a "m7Sex experience coefficient, a', representing lean body mass calculation "m8Representing an empirical coefficient of age, a, for lean body mass calculation "m9Representing empirical coefficients of body weight, a', for lean body mass calculation "10The cross-sectional area empirical coefficient used for lean body mass calculation is shown, and W represents body weight.
The human body composition analysis method based on the human body composition analyzer comprises the following steps:
acquiring the height, the diameter of four limbs, the length and width of a trunk, the thickness of the trunk and impedance of each frequency band of a detected person;
calculating the sectional area of the limbs of the person to be detected according to the diameters of the limbs of the person to be detected;
calculating the sectional area of the trunk of the tested person according to the length and the width of the trunk and the thickness of the trunk;
and calculating the body composition of the person to be detected according to the impedance, height, weight, age, sex, length of limbs, cross-sectional area of limbs and cross-sectional area of trunk of the person to be detected in each frequency band.
Preferably, the formula for calculating the weight of the extracellular fluid of the tested person is as follows:
wherein ECW represents the weight of the extracellular fluid; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a ismnIs an empirical coefficient for the calculation of the weight of the extracellular fluid, wherein am0Denotes the overall empirical factor, a, used for the calculation of the weight of the extracellular fluidm7Represents the empirical factor of sex, a, used in the calculation of the weight of the extracellular fluidm8Represents an empirical age coefficient, a, for the calculation of the weight of the extracellular fluidm9Denotes the empirical factor of body weight, a, for the calculation of the weight of the extracellular fluid10The empirical coefficient of cross-sectional area used for the calculation of the weight of the extracellular fluid is shown, and W represents the body weight.
Preferably, the calculation formula of the total human body moisture of the detected person is as follows:
in the formula, TBWmRepresents the total moisture of the human body; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a'mnIs an empirical coefficient calculated for the total moisture of the human body, wherein, a'm0Represents a total empirical coefficient, a ', for calculation of total body moisture'm7Represents a gender empirical coefficient, a 'for calculation of total human body moisture'm8Represents an empirical age coefficient, a 'for calculation of total body water'm9Represents a body weight empirical coefficient, a ', for calculation of total body water content'10The empirical coefficient of cross-sectional area used for calculation of total body water is shown, and W represents body weight.
Preferably, the formula for calculating the lean body mass of the person to be measured is as follows:
in the formula, FFMmRepresenting lean body mass; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a "mnEmpirical coefficients for calculation of lean body mass, wherein, a "m0Representing the overall empirical coefficient for lean body mass calculation, a "m7Sex experience coefficient, a', representing lean body mass calculation "m8Representing an empirical coefficient of age, a, for lean body mass calculation "m9Representing weight experience for lean body mass calculationCoefficient, a "10The cross-sectional area empirical coefficient used for lean body mass calculation is shown, and W represents body weight.
The invention has the beneficial effects that: by introducing the human body shape information, the invention reduces the sample data size required by modeling, improves the accuracy of measurement and improves the adaptability to the crowd. Please supplement the principle analysis of the present invention with the above-mentioned effects, i.e., why the solution of the present invention has the above-mentioned effects
Drawings
FIG. 1 is a schematic diagram of a human body segment impedance measurement;
FIG. 2 is a schematic diagram of a body composition analyzer based on body morphology;
FIG. 3 is a schematic diagram of a body impedance model;
FIG. 4 is a flow chart of a method of analyzing a body composition;
in the figure, 1-height measuring device, 2-measured person, 3-multi-frequency impedance measuring device, 4-first camera, 5-computer, 6-second camera.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1 to 4, the present embodiment provides a human body composition analyzer and method based on human body morphology:
example one
As shown in FIG. 2, the human body composition analyzer based on human body morphology comprises a height measuring device 1, a multi-frequencyimpedance measuring device 3, afirst camera 4, asecond camera 6 and acomputer 5, wherein the height measuring device 1, the multi-frequency impedance measuringdevice 3, thefirst camera 4 and thesecond camera 6 are in communication connection with thecomputer 5.
Specifically, the height measuring device 1 is used for measuring the height of the measuredperson 2, for example, the height measuring device 1 is a height ruler. The multi-frequencyimpedance measuring device 3 is used for detecting impedance of each frequency band of theperson 2 to be measured, as shown in fig. 2, theperson 2 to be measured stands on the multi-frequencyimpedance measuring device 3, and the impedance of each frequency band of theperson 2 to be measured can be measured by holding electrodes left and right, as shown in fig. 1, E1, E2, E3 and E4 are excitation electrodes, and V1, V2, V3 and V4 are measurement electrodes. Thefirst camera 4 is positioned right in front of the testedperson 2 and is used for acquiring a front image of the testedperson 2; thesecond camera 6 is located on the side of theperson 2 to be measured and used for collecting the side image of theperson 2 to be measured. Thecomputer 5 can obtain the diameter of a first limb, the length of the first limb and the length and width of the trunk of theperson 2 to be detected through a trigonometric function according to the distance between thefirst camera 4 and theperson 2 to be detected and the frontal image; according to the distance between thesecond camera 6 and theperson 2 to be detected and the side images, the diameter of a second limb, the length of the second limb and the thickness of the trunk of theperson 2 to be detected can be obtained through a trigonometric function; averaging the first limb diameter and the second limb diameter of the testedperson 2 to obtain the limb diameter of the testedperson 2; averaging the length of the first four limbs and the length of the second four limbs of theperson 2 to be measured to obtain the length of the four limbs of theperson 2 to be measured; the limbs of the person to be detected 2 are defined to be cylinders, then the sectional areas of the limbs of the person to be detected 2 can be obtained according to the diameters of the limbs of the person to be detected 2, the sectional area of the trunk of the person to be detected 2 can be obtained according to the length and the width of the trunk and the thickness of the trunk of the person to be detected 2, and the body composition of the person to be detected 2 is calculated according to the impedance, the height, the weight, the age, the sex, the length of the limbs, the sectional area of the limbs and the sectional area of the trunk of the person to be detected 2 in each frequency band.
According to the scheme of the embodiment, the body length and the sectional area information of the individual are utilized in the model, so that the individual characteristics can be more accurately expressed by each model. The principle is derived as follows:
taking the impedance model of limbs as an example, assuming a conductor with a cylinder of limbs as shown in fig. 3, it can be seen that the impedance Z of the cylinder is proportional to the resistivity ρ and the length L of the limb, and inversely proportional to the transverse area S of the cylinder. Meanwhile, if the mass of the model is M and the average density is rho', the method has the following derivation
And also
W＝M×g＝ρ'V
Therefore, the height and L correlation is used:
H∝L
in the conventional measuring device, since no image head device is provided, the length L information of each limb part cannot be accurately obtained, that is, the formula used in the conventional product is generally:
in some embodiments, the extracellular fluid weight of theperson 2 under test is calculated by the formula:
wherein ECW represents the weight of the extracellular fluid; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a ismnIs used for extracellular fluid weighingCalculated empirical coefficients, wherein am0Denotes the overall empirical factor, a, used for the calculation of the weight of the extracellular fluidm7Represents the empirical factor of sex, a, used in the calculation of the weight of the extracellular fluidm8Represents an empirical age coefficient, a, for the calculation of the weight of the extracellular fluidm9Denotes the empirical factor of body weight, a, for the calculation of the weight of the extracellular fluid10The empirical coefficient of cross-sectional area used for the calculation of the weight of the extracellular fluid is shown, and W represents the body weight.
In some embodiments, the calculation formula of the total human body moisture of theperson 2 to be measured is as follows:
in the formula, TBWmRepresents the total moisture of the human body; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a'mnIs an empirical coefficient calculated for the total moisture of the human body, wherein, a'm0Represents a total empirical coefficient, a ', for calculation of total body moisture'm7Represents a gender empirical coefficient, a 'for calculation of total human body moisture'm8Represents an empirical age coefficient, a 'for calculation of total body water'm9Represents a body weight empirical coefficient, a ', for calculation of total body water content'10The empirical coefficient of cross-sectional area used for calculation of total body water is shown, and W represents body weight.
In some embodiments, the formula for calculating the lean body mass of theperson 2 under test is:
in the formula, FFMmRepresenting lean body mass;sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a "mnEmpirical coefficients for calculation of lean body mass, wherein, a "m0Representing the overall empirical coefficient for lean body mass calculation, a "m7Sex experience coefficient, a', representing lean body mass calculation "m8Representing an empirical coefficient of age, a, for lean body mass calculation "m9Representing empirical coefficients of body weight, a', for lean body mass calculation "10The cross-sectional area empirical coefficient used for lean body mass calculation is shown, and W represents body weight.
Empirical coefficient amn、a'mn、a”mnThe acquisition method comprises the following steps: method for measuring different ages by using Magnetic Resonance Imaging (MRI)
Data of gender and height (for example 200 persons), an empirical coefficient in the above formula is derived and optimized through body composition data of the persons, and finally the empirical coefficient is verified and optimized through testing of additional 200 persons, and finally the empirical coefficient is fixed.
Example two
As shown in fig. 4, the method for analyzing human body composition includes:
s1, collecting the height, the diameter of four limbs, the length and the width of a trunk, the thickness of the trunk and impedance of each frequency band of a testedperson 2.
Specifically, the S1 includes:
s11, the height of theperson 2 to be measured is measured by the height measuring device 1.
S12, detecting the impedance of each frequency band of theperson 2 to be detected by using the multi-frequencyimpedance measuring device 3.
As shown in FIG. 1, Z1Is the impedance of the left arm at a certain frequency, Z2Is the impedance of the right arm at a certain frequency, Z3Is the impedance of the left leg at a certain frequency, Z4Is the impedance of the right leg at a certain frequency，Z5Is the impedance of the torso at a certain frequency.
S13, acquiring a front image of the detectedperson 2 by using thefirst camera 4.
S14, acquiring a side image of the detectedperson 2 by using thesecond camera 6.
And S15, calculating the lengths of the four limbs of theperson 2 to be tested according to the front image and the side image of the person to be tested.
As shown in FIG. 1, L1Is the length of the left arm, L2Is the length of the right arm, L3Is the length of the left leg, L4The length of the right leg.
And S16, calculating the sectional areas of the four limbs of theperson 2 to be detected according to the front image and the side image of the person to be detected.
As shown in FIG. 1, S1Is the cross-sectional area of the left arm, S2Is the cross-sectional area of the right arm, S3Is the cross-sectional area of the left leg, S4The cross-sectional area of the right leg.
And S17, calculating the sectional area of the trunk of theperson 2 to be detected according to the front image and the side image of the person to be detected.
As shown in FIG. 1, S5The cross-sectional area of the torso.
It should be noted that the labels before the steps do not affect the execution sequence, for example, S13 and S14 may be executed simultaneously, or S14 may be executed first; s16 and S17 may be performed simultaneously, or S17 may be performed first.
S2, calculating the cross sections of the four limbs of theperson 2 to be measured according to the diameters of the four limbs.
And S3, calculating the sectional area of the trunk of the testedperson 2 according to the length and the width of the trunk and the thickness of the trunk.
And S4, calculating the body composition of theperson 2 to be detected according to the impedance, the height, the weight, the age, the sex, the length of the limbs, the cross-sectional area of the limbs and the cross-sectional area of the trunk of theperson 2 to be detected in each frequency band.
In some embodiments, the extracellular fluid weight of theperson 2 under test is calculated by the formula:
wherein ECW represents the weight of the extracellular fluid; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a ismnIs an empirical coefficient for the calculation of the weight of the extracellular fluid, wherein am0Denotes the overall empirical factor, a, used for the calculation of the weight of the extracellular fluidm7Represents the empirical factor of sex, a, used in the calculation of the weight of the extracellular fluidm8Represents an empirical age coefficient, a, for the calculation of the weight of the extracellular fluidm9Denotes the empirical factor of body weight, a, for the calculation of the weight of the extracellular fluid10The empirical coefficient of cross-sectional area used for the calculation of the weight of the extracellular fluid is shown, and W represents the body weight.
In some embodiments, the calculation formula of the total human body moisture of theperson 2 to be measured is as follows:
in the formula, TBWmRepresents the total moisture of the human body; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a'mnIs an empirical coefficient calculated for the total moisture of the human body, wherein, a'm0Represents a total empirical coefficient, a ', for calculation of total body moisture'm7Represents a gender empirical coefficient, a 'for calculation of total human body moisture'm8Represents an empirical age coefficient, a 'for calculation of total body water'm9Represents a body weight empirical coefficient, a ', for calculation of total body water content'10The empirical coefficient of cross-sectional area used for calculation of total body water is shown, and W represents body weight.
In some embodiments, the formula for calculating the lean body mass of theperson 2 under test is:
in the formula, FFMmRepresenting lean body mass; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a "mnEmpirical coefficients for calculation of lean body mass, wherein, a "m0Representing the overall empirical coefficient for lean body mass calculation, a "m7Sex experience coefficient, a', representing lean body mass calculation "m8Representing an empirical coefficient of age, a, for lean body mass calculation "m9Representing empirical coefficients of body weight, a', for lean body mass calculation "10The cross-sectional area empirical coefficient used for lean body mass calculation is shown, and W represents body weight.
Empirical coefficient amn、a'mn、a”mnThe acquisition method comprises the following steps: method for measuring different ages by using Magnetic Resonance Imaging (MRI)
Data of gender and height (for example 200 persons), an empirical coefficient in the above formula is derived and optimized through body composition data of the persons, and finally the empirical coefficient is verified and optimized through testing of additional 200 persons, and finally the empirical coefficient is fixed.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. Human body composition analysis appearance based on human body form, its characterized in that includes:
the height measuring device is used for measuring the height of the measured person;
the multi-frequency impedance measuring device is used for detecting the impedance of each frequency band of a detected person;
the first camera is used for acquiring a front image of a detected person;
the second camera is used for acquiring a side image of the person to be detected;
and the computer is used for calculating the length of four limbs of the person to be detected according to the front image and the side image of the person to be detected, calculating the sectional area of the trunk of the person to be detected according to the front image and the side image of the person to be detected, and calculating the body composition of the person to be detected according to the impedance, the height, the weight, the age, the sex, the length of the four limbs, the sectional area of the four limbs and the sectional area of the trunk of the person to be detected in each frequency band.
2. The human body composition analyzer based on human body morphology according to claim 1, wherein the formula for calculating the extracellular fluid weight of the person to be measured is:
wherein ECW represents the weight of the extracellular fluid; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, and 50kH when n is 3z, when n is 4, the frequency is 500kHz, and when n is 5, the frequency is 1 MHz; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a ismnIs an empirical coefficient for the calculation of the weight of the extracellular fluid, wherein am0Denotes the overall empirical factor, a, used for the calculation of the weight of the extracellular fluidm7Represents the empirical factor of sex, a, used in the calculation of the weight of the extracellular fluidm8Represents an empirical age coefficient, a, for the calculation of the weight of the extracellular fluidm9Denotes the empirical factor of body weight, a, for the calculation of the weight of the extracellular fluid10The empirical coefficient of cross-sectional area used for the calculation of the weight of the extracellular fluid is shown, and W represents the body weight.
3. The human body composition analyzer based on human body morphology according to claim 1, wherein the calculation formula of the human body total moisture of the person to be measured is:
in the formula, TBWmRepresents the total moisture of the human body; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a'mnIs an empirical coefficient calculated for the total moisture of the human body, wherein, a'm0Represents a total empirical coefficient, a ', for calculation of total body moisture'm7Represents a gender empirical coefficient, a 'for calculation of total human body moisture'm8Represents an empirical age coefficient, a 'for calculation of total body water'm9Represents a body weight empirical coefficient, a ', for calculation of total body water content'10The empirical coefficient of cross-sectional area used for calculation of total body water is shown, and W represents body weight.
4. The human body composition analyzer based on human body morphology according to claim 1, wherein the calculation formula of the lean body mass of the person to be measured is:
in the formula, FFMmRepresenting lean body mass; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a "mnEmpirical coefficients for calculation of lean body mass, wherein, a "m0Representing the overall empirical coefficient for lean body mass calculation, a "m7Sex experience coefficient, a', representing lean body mass calculation "m8Representing an empirical coefficient of age, a, for lean body mass calculation "m9Representing empirical coefficients of body weight, a', for lean body mass calculation "10The cross-sectional area empirical coefficient used for lean body mass calculation is shown, and W represents body weight.
5. The human body composition analysis method based on the human body composition analyzer of any one of claims 1 to 4, comprising:
acquiring the height, the diameter of four limbs, the length and width of a trunk, the thickness of the trunk and impedance of each frequency band of a detected person;
calculating the sectional area of the limbs of the person to be detected according to the diameters of the limbs of the person to be detected;
calculating the sectional area of the trunk of the tested person according to the length and the width of the trunk and the thickness of the trunk;
and calculating the body composition of the person to be detected according to the impedance, height, weight, age, sex, length of limbs, cross-sectional area of limbs and cross-sectional area of trunk of the person to be detected in each frequency band.
6. The human body composition analyzer based on human body morphology according to claim 1, wherein the formula for calculating the extracellular fluid weight of the person to be measured is:
wherein ECW represents the weight of the extracellular fluid; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a ismnIs an empirical coefficient for the calculation of the weight of the extracellular fluid, wherein am0Denotes the overall empirical factor, a, used for the calculation of the weight of the extracellular fluidm7Represents the empirical factor of sex, a, used in the calculation of the weight of the extracellular fluidm8Represents an empirical age coefficient, a, for the calculation of the weight of the extracellular fluidm9Denotes the empirical factor of body weight, a, for the calculation of the weight of the extracellular fluid10The empirical coefficient of cross-sectional area used for the calculation of the weight of the extracellular fluid is shown, and W represents the body weight.
7. The human body composition analyzer based on human body morphology according to claim 1, wherein the calculation formula of the human body total moisture of the person to be measured is:
in the formula, TBWmRepresents the total moisture of the human body; sex represents gender, male 1, female 0; m represents a body part, m represents the left arm when m takes 1, m represents the right arm when m takes 2, and m represents 3A left leg, wherein when m is 4, the right leg is shown, and when m is 5, the trunk is shown; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a'mnIs an empirical coefficient calculated for the total moisture of the human body, wherein, a'm0Represents a total empirical coefficient, a ', for calculation of total body moisture'm7Represents a gender empirical coefficient, a 'for calculation of total human body moisture'm8Represents an empirical age coefficient, a 'for calculation of total body water'm9Represents a body weight empirical coefficient, a ', for calculation of total body water content'10The empirical coefficient of cross-sectional area used for calculation of total body water is shown, and W represents body weight.
8. The human body composition analyzer based on human body morphology according to claim 1, wherein the calculation formula of the lean body mass of the person to be measured is:
in the formula, FFMmRepresenting lean body mass; sex represents gender, male 1, female 0; m represents a body part, when m takes 1, the left arm is represented, when m takes 2, the right arm is represented, when m takes 3, the left leg is represented, when m takes 4, the right leg is represented, and when m takes 5, the trunk is represented; n represents the test frequency, 1kHz when n is 1, 5kHz when n is 2, 50kHz when n is 3, 500kHz when n is 4, and 1MHz when n is 5; zmnRepresents the impedance of a body part m at a frequency n; smRepresents the cross-sectional area of the limb; a "mnEmpirical coefficients for calculation of lean body mass, wherein, a "m0Representing the overall empirical coefficient for lean body mass calculation, a "m7Sex experience coefficient, a', representing lean body mass calculation "m8Representing an empirical coefficient of age, a, for lean body mass calculation "m9Representing empirical coefficients of body weight, a', for lean body mass calculation "10Cross-sectional area for lean body mass calculationThe coefficient of experiment, W, represents body weight.
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