阅读说明：本技术 一种营养代谢综合测试仪及其检测方法 (Comprehensive nutrition metabolism tester and detection method thereof ) 是由 王远 汪兰兰 何子军 朱堃 孟良 王彦彩 徐玉兵 陈焱焱 周旭 马祖长 于 2019-10-24 设计创作，主要内容包括：本发明公开了一种营养代谢综合测试仪及其检测方法,测试仪的采集控制部分分别与舱体测试部分、呼吸气体采集部分和气体浓度分析部分连接；人机交互部分与采集控制部分连接,控制着阀门与抽气泵的工作并且收集上述传感器所检测到的数据从而进行上传。人机交互部分与采集控制部分连接,接收其传来的各部分数据并进行分析处理和结果的显示。利用间接测热法的原理,通过测试舱与平衡舱内的压强变化间接测量出在一定时间内根据氧气消耗量和二氧化碳的产生量来计算出人体的能量消耗,以及三大营养物质在能量消耗中的构成,并可以准确测量出人体的脂肪含量以及非脂肪含量,其测量结果准确可靠。(The invention discloses a nutrition metabolism comprehensive tester and a detection method thereof.A collection control part of the tester is respectively connected with a cabin body testing part, a respiratory gas collection part and a gas concentration analysis part; the man-machine interaction part is connected with the acquisition control part, controls the work of the valve and the air pump and collects the data detected by the sensor so as to upload the data. The human-computer interaction part is connected with the acquisition control part, receives the data of all parts transmitted by the acquisition control part, and performs analysis processing and result display. By utilizing the principle of indirect heat measurement, the energy consumption of the human body and the composition of three nutrient substances in the energy consumption are indirectly measured according to the oxygen consumption and the carbon dioxide generation within a certain time by the pressure change in the test chamber and the balance chamber, the fat content and the non-fat content of the human body can be accurately measured, and the measurement result is accurate and reliable.)

1. A nutrition metabolism comprehensive tester is characterized by comprising a cabin testing part, a respiratory gas collecting part, a gas concentration analyzing part, a collecting control part and a man-machine interaction part, wherein,

the cabin body testing part comprises a testing cabin, a seat, a weighing sensor, an air pressure sensor, a balance cabin, a valve II and a valve I, wherein the seat and the air pressure sensor are arranged in the testing cabin;

the respiratory gas collecting part comprises a gas collecting pipeline, a flow sensor, a damper and a first air pump, wherein the gas collecting pipeline is sequentially connected with inlets of the test chamber and the flow sensor, the joint of the gas collecting pipeline and the test chamber is an inlet and an outlet of respiratory gas, an outlet of the flow sensor is connected with an inlet of the damper, and an outlet of the damper is connected with the first air pump;

the gas concentration analysis part comprises a four-way electromagnetic valve, a high-concentration calibration gas cylinder, a low-concentration calibration gas cylinder, an oxygen sensor, a carbon dioxide sensor and a second air pump, wherein the upper port of the four-way electromagnetic valve is connected with a gas pipeline between a flow sensor and a damper, the lower port of the four-way electromagnetic valve is respectively connected with the high-concentration calibration gas cylinder and the low-concentration calibration gas cylinder, the left port of the four-way electromagnetic valve is used for pumping air in the environment, the right port of the four-way electromagnetic valve is respectively connected with inlets of the oxygen sensor and the carbon dioxide sensor, outlets of the oxygen sensor and the carbon dioxide sensor are respectively connected with the second air pump, and gas pumped from the upper port, the left port and the lower port of the four-way electromagnetic valve respectively enters the oxygen sensor and the;

the acquisition control part is respectively connected with the cabin body testing part, the breathing gas acquisition part and the gas concentration analysis part;

the human-computer interaction part is connected with the acquisition control part.

2. The comprehensive tester of nutrient metabolism as claimed in claim 1, wherein the volume of the balance chamber in the test part of the chamber body is 40L-50L.

3. A detection method of a nutrition metabolism comprehensive tester is characterized by comprising the following steps:

(I) before a subject starts to measure, opening a lower port and a right port of a four-way electromagnetic valve and a valve of a low-concentration calibration gas cylinder, closing the other two ports of the four-way electromagnetic valve, performing gas extraction treatment by using a second air extraction pump, enabling gas in the low-concentration calibration gas cylinder to pass through an oxygen sensor and a carbon dioxide sensor respectively, completing low-concentration calibration of the oxygen sensor and the carbon dioxide sensor after 3-10 minutes, and then closing the valve of the low-concentration calibration gas cylinder and the second air extraction pump; opening valves of the high-concentration calibration gas cylinder, keeping the opening states of the upper port and the right port of the four-way electromagnetic valve, opening the second air pump again to perform air extraction treatment, enabling gas in the high-concentration calibration gas cylinder to pass through the oxygen sensor and the carbon dioxide sensor respectively, completing high-concentration calibration of the oxygen sensor and the carbon dioxide sensor after ventilation for 3-10 minutes, and closing the valves after the high-low gas concentration calibration is finished;

(II) opening a left port and a right port of the four-way electromagnetic valve and a second air pump, respectively transmitting the air in the extracted test environment to an oxygen sensor and a carbon dioxide sensor by the second air pump, and respectively testing the average oxygen concentration and the carbon dioxide concentration of the air in the environment by the oxygen sensor and the carbon dioxide sensor after 3-10 minutes;

(III) before the testee enters the test chamber, the weight G of the chamber body is measured by the weighing sensor₁After the subject enters, the weighing sensor measures the whole weight G of the human body and the cabin again₂Opening the first valve to enable the subject to breathe normally and to be in a resting state; after 5-20 minutes, opening an upper port and a right port of the four-way electromagnetic valve, enabling breathing gas of a subject to enter air after entering a damper through a flow sensor, and pumping the breathing gas from an air pipe in the middle of the flow sensor and the damper by a second air pump to enter the upper end of the four-way electromagnetic valve and transmit the breathing gas to an oxygen sensor and a carbon dioxide sensor; the flow sensor measures the flow data of the exhaled gas, the gas concentration analysis part periodically extracts the gas, the average concentration data of oxygen and carbon dioxide are measured, and the acquisition control part collects and processes the measured data;

(IV) after the measurement of the gas part is finished, closing the first valve, opening the first air suction pump to perform air suction treatment for 30 seconds, and measuring the pressure in the test chamber to be P by the air pressure sensor_AOpening a second valve to enable the gas between the two chambers to normally circulate, and after the calibration is stable for 3 minutes, measuring the pressure in the chamber to be P again by the pressure sensor in the test chamber_BThe pressure in the balance chamber is equal to the pressure in the test chamber and is P_BThe acquisition control part collects and processes the data;

and (V) after receiving the data transmitted by the acquisition control device, the man-machine interaction part carries out analysis and calculation and displays the measurement result in a report form.

4. The method as claimed in claim 3, wherein the estimation of the amount of oxygen intake and carbon dioxide output in the respiratory gas by the human-computer interaction part is as follows:

volume of mixed gas discharged from test chamber:

nitrogen concentration in the mixed gas discharged from the test chamber: f_EN2＝1-F_ECO2-F_EO2

Nitrogen concentration in ambient air: f_IN2＝1-F_ICO2-F_IO2

Volume of air pumped into the test chamber: v_in＝V_out×F_EN2/F_IN2

Oxygen uptake: v_O2＝V_in×F_EO2-V_out×F_IO2

Carbon dioxide emission: v_CO2＝V_out×F_ICO2-V_in×F_ECO2

Wherein: v (t) is the instantaneous flow rate of the gas; t is t₁Is the time point at which sampling begins; t is t₂The time point of the end of sampling; f_ECO2Is the average carbon dioxide concentration in the mixed gas exiting the test chamber; f_EO2The average oxygen concentration in the mixed gas discharged from the test chamber; f_IO2Is the average oxygen concentration in the air being drawn; f_ICO2Is the average carbon dioxide concentration in the air drawn.

5. The method of claim 3, wherein the calculation of the volume of body fat and non-fat by the human-computer interaction part is as follows:

body weight of human body: g ═ G₂-G₁＝ρ₁V₁+ρ₂V₂

Total volume of human body: v is V₁+V₂

Test chamber internal volume: v_A＝V+V_B

The air extracting pump extracts air from the front two cabins: p_AV_B+P_{Big (a)}V_C＝nRT (1)

Two cabins after the air pump pumps air: p_BV_B+P_BV_C＝nRT (2)

The two formulas (1) and (2) can be obtained:

the total volume of the human body can be calculated as follows:

volume of fat in human body:

volume of non-fat in human:

wherein: rho₁Is the human body fat density; rho₂Is the non-fat density of the human body; v₁Is the body fat volume; v₂Is the non-fat volume; v_AIs the volume within the test chamber; v_BTesting the vacant volume in the cabin; v_CIs the balance cabin volume; p_AFor testing the pressure, P, of the chamber after being evacuated_BAfter the test chamber is pumped, the pressure of the test chamber and the pressure of the balance chamber are tested.

Technical Field

The invention relates to the technical field of gas sample collection and analysis and human body fat content analysis, in particular to a nutrition metabolism comprehensive tester and a detection method thereof.

Background

Protein, fat and carbohydrate are three main nutrients required by a human body, and the metabolic conditions of the three main nutrients are directly related to the health of the human body. The metabolism test system obtains key parameters of human breath quotient, basic metabolic rate, resting energy consumption and the like by measuring oxygen intake and carbon dioxide discharge of a human body, and then evaluates the nutrition metabolism condition of the human body. Medical personnel can formulate the best health intervention scheme according to the test parameters of the patient, provide reasonable and effective nutritional support for the patient, and promote the metabolic balance of the patient.

The existing metabolism test system is developed according to the principle of an indirect heat measurement method, can measure the nutrient metabolism condition of a human body and guides the nutrient intake and healthy movement of the human body. The indirect heat measurement method mainly goes through three main stages, the first stage is the classic "Douglas bag method" (Douglas bag), the gas breathed by a human body within a period of time is collected in a large-volume bag for measurement, the measurement result is accurate, and the measurement result is the "gold standard" of the metabolic test, but the operation process is extremely complex. The second stage is a 'Mixing-bag' method, and the computer can analyze the gas in the testing process, so that the leap of the gas metabolism testing substance is realized. The third stage is a 'gas-per-breath test method', so that the dynamic performance of the mixed gas bag method is improved, and real-time measurement is realized.

Most of gas metabolism tests in the current market adopt a hood type indirect energy metabolism test method based on a per-breath test method, the test process of the method is long, a test subject needs to wear a hood all the time, and the experience feeling of the test subject is relatively poor. The hood type energy metabolism test method can indirectly measure the energy consumption of a human body and the composition of three nutrient substances in the energy consumption, but cannot accurately measure the content of the nutrient substances in the human body, thereby analyzing the influence on the energy consumption.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide a comprehensive nutrition metabolism tester and a detection method thereof, and aims to solve the problems that the test process time of the hood type indirect energy metabolism test method provided in the background technology is long, a testee needs to wear a hood all the time, and the experience of the testee is relatively poor. The hood type energy metabolism test method can indirectly measure the energy consumption of a human body and the composition of three nutrient substances in the energy consumption, but cannot accurately measure the content of the nutrient substances in the human body, so that the problem of influence on the energy consumption is analyzed.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a nutrition metabolism comprehensive tester comprises a cabin testing part, a respiratory gas collecting part, a gas concentration analyzing part, a collecting control part and a man-machine interaction part, wherein,

the cabin body testing part comprises a testing cabin, a seat, a weighing sensor, an air pressure sensor, a balance cabin, a valve II and a valve I, wherein the seat and the air pressure sensor are arranged in the testing cabin;

the respiratory gas collecting part comprises a gas collecting pipeline, a flow sensor, a damper and a first air pump, wherein the gas collecting pipeline is sequentially connected with inlets of the test chamber and the flow sensor, the joint of the gas collecting pipeline and the test chamber is an inlet and an outlet of respiratory gas, an outlet of the flow sensor is connected with an inlet of the damper, and an outlet of the damper is connected with the first air pump;

the gas concentration analysis part comprises a four-way electromagnetic valve, a high-concentration calibration gas cylinder, a low-concentration calibration gas cylinder, an oxygen sensor, a carbon dioxide sensor and a second air pump, wherein the upper port of the four-way electromagnetic valve is connected with a gas pipeline between a flow sensor and a damper, the lower port of the four-way electromagnetic valve is respectively connected with the high-concentration calibration gas cylinder and the low-concentration calibration gas cylinder, the left port of the four-way electromagnetic valve is used for pumping air in the environment, the right port of the four-way electromagnetic valve is respectively connected with inlets of the oxygen sensor and the carbon dioxide sensor, outlets of the oxygen sensor and the carbon dioxide sensor are respectively connected with the second air pump, and gas pumped from the upper port, the left port and the lower port of the four-way electromagnetic valve respectively enters the oxygen sensor and the;

the acquisition control part is respectively connected with the cabin body testing part, the breathing gas acquisition part and the gas concentration analysis part;

the human-computer interaction part is connected with the acquisition control part.

As a further improvement of the invention, the volume of the balance cabin in the testing part of the cabin body is 40L-50L, and the balance cabin is connected with the gas pipeline of the testing cabin and controls the gas communication between the balance cabin and the gas pipeline through a valve.

The invention also provides a detection method of the comprehensive nutrient metabolism tester, which comprises the following steps:

(I) before a subject starts to measure, opening a lower port and a right port of a four-way electromagnetic valve and a valve of a low-concentration calibration gas cylinder, closing the other two ports of the four-way electromagnetic valve, performing gas extraction treatment by using a second air extraction pump, enabling gas in the low-concentration calibration gas cylinder to pass through an oxygen sensor and a carbon dioxide sensor respectively, completing low-concentration calibration of the oxygen sensor and the carbon dioxide sensor after 3-10 minutes, and then closing the valve of the low-concentration calibration gas cylinder and the second air extraction pump; opening valves of the high-concentration calibration gas cylinder, keeping the opening states of the upper port and the right port of the four-way electromagnetic valve, opening the second air pump again to perform air extraction treatment, enabling gas in the high-concentration calibration gas cylinder to pass through the oxygen sensor and the carbon dioxide sensor respectively, completing high-concentration calibration of the oxygen sensor and the carbon dioxide sensor after ventilation for 3-10 minutes, and closing the valves after the high-low gas concentration calibration is finished;

(II) opening a left port and a right port of the four-way electromagnetic valve and a second air pump, respectively transmitting the air in the extracted test environment to an oxygen sensor and a carbon dioxide sensor by the second air pump, and respectively testing the average oxygen concentration and the carbon dioxide concentration of the air in the environment by the oxygen sensor and the carbon dioxide sensor after 3-10 minutes;

(III) before the testee enters the test chamber, the weight G of the chamber body is measured by the weighing sensor₁After the subject enters, the weighing sensor measures the whole weight G of the human body and the cabin again₂Opening the first valve to enable the subject to breathe normally and to be in a resting state; after 5-20 minutes, opening an upper port and a right port of the four-way electromagnetic valve, enabling breathing gas of a subject to enter air after entering a damper through a flow sensor, and pumping the breathing gas from an air pipe in the middle of the flow sensor and the damper by a second air pump to enter the upper end of the four-way electromagnetic valve and transmit the breathing gas to an oxygen sensor and a carbon dioxide sensor; the flow sensor measures the flow data of the exhaled gas, the gas concentration analysis part periodically extracts the gas, the average concentration data of oxygen and carbon dioxide are measured, and the acquisition control part collects and processes the measured data;

(IV) after the measurement of the gas part is finished, closing the first valve, opening the first air suction pump to perform air suction treatment for 30 seconds, and measuring the pressure in the test chamber to be P by the air pressure sensor_AOpening the second valve to make the gas between the two chambers normally circulate, and testing the air pressure sensing in the chamber after the calibration is stable for 3 minutesThe pressure in the chamber is measured again by the device at the moment_BThe pressure in the balance chamber is equal to the pressure in the test chamber and is P_BThe acquisition control part collects and processes the data;

and (V) after receiving the data transmitted by the acquisition control device, the man-machine interaction part carries out analysis and calculation and displays the measurement result in a report form.

(III) advantageous effects

Compared with the prior art, after the technical scheme is adopted, the invention has the beneficial effects that:

1. according to the comprehensive tester for nutrition metabolism, a testee does not need to wear a hood in the testing process, fresh air can be freely breathed, the testing environment is relatively easy and comfortable, and compared with a hood type gas metabolism measuring device which is relatively mainstream in the market at present, the testee of the tester can freely move in a cabin, so that the comprehensive testing method for nutrition metabolism is simple, convenient and comfortable.

2. According to the invention, a balance cabin with a known volume is designed to be connected with the test cabin, the test cabin is subjected to air extraction treatment through the air extraction pump, the pressure sensor sequentially measures the pressure intensity in the test cabin, the body fat content of a human body is indirectly calculated, and the calculation process is relatively simple and accurate.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the gas portion of the present invention;

FIG. 3 is a flow chart of the operation of the present invention;

description of reference numerals:

1. a test chamber; 2. a seat; 3. a weighing sensor; 4. an air pressure sensor; 5. a balance cabin; 6. a second valve; 7. a first valve; 8. a respiratory gas collection section; 9. a gas concentration analyzing section; 10. an acquisition control section; 11. a human-computer interaction part; 12. a flow sensor; 13. a damper; 14. a first air suction pump; 15. a four-way solenoid valve; 16. a high-concentration calibration gas cylinder; 17. a low-concentration calibration gas cylinder; 18. an oxygen sensor; 19. a carbon dioxide sensor; 20. a second air pump; 21. cabin testing part.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, an embodiment of the present invention is shown: a nutrition metabolism comprehensive tester comprises a cabin body testing part 21, a breathing gas collecting part 8, a gas concentration analyzing part 9, a collecting control part 9 and a man-machine interaction part 11, wherein the cabin body testing part 21 comprises a testing cabin 1, a seat 2, a weighing sensor 3, an air pressure sensor 4, a balance cabin 5, a valve II 6 and a valve I7, the seat 2 and the air pressure sensor 4 are arranged inside the testing cabin 1, the bottom of the outer side of the testing cabin 1 is connected with the weighing sensor 3, the testing cabin 1 is connected with the balance cabin 5 through the valve II 6, and the valve I7 for controlling air circulation is arranged on the testing cabin 1; the respiratory gas collection part 8 comprises a gas collection pipeline, a flow sensor 12, a damper 13 and a first air pump 14, wherein the gas collection pipeline is sequentially connected with inlets of the test chamber 1 and the flow sensor 12, the joint of the gas collection pipeline and the test chamber 1 is an inlet and an outlet of respiratory gas, an outlet of the flow sensor 12 is connected with an inlet of the damper 13, an outlet of the damper 13 is connected with the first air pump 14, the first air pump 14 is used for extracting the respiratory gas of a subject in the test chamber through the gas pipeline and finally exhausting the respiratory gas into the air, the damper 13 is used for stabilizing air flow during air extraction, and the flow sensor 12 is used for measuring the flow rate; the gas concentration analysis part 9 comprises a four-way electromagnetic valve 15, a high concentration calibration gas cylinder 16, a low concentration calibration gas cylinder 17, an oxygen sensor 18, a carbon dioxide sensor 19 and a second air pump 20, the upper port of the four-way solenoid valve 15 is connected with a gas pipeline between the flow sensor 12 and the damper 13 for pumping air in the gas pipeline, the lower port of the four-way electromagnetic valve 15 is respectively connected with a high-concentration calibration gas cylinder 16 and a low-concentration calibration gas cylinder 17, the left port of the four-way electromagnetic valve 15 is used for extracting air in the environment, the right port of the four-way electromagnetic valve 15 is respectively connected with inlets of an oxygen sensor 18 and a carbon dioxide sensor 19, outlets of the oxygen sensor 18 and the carbon dioxide sensor 19 are respectively connected with a second air pump 20, and air extracted from the upper port, the left port and the lower port of the four-way electromagnetic valve 15 respectively enters the oxygen sensor 18 and the carbon dioxide sensor 19 through the right ports. The acquisition control part 10 is respectively connected with the cabin body testing part 21, the respiratory gas acquisition part 8 and the gas concentration analysis part 9, controls the work of the valves and the air pump and collects the data detected by the sensors so as to upload the data. The human-computer interaction part 11 is connected with the acquisition control part 10, receives the data of each part transmitted by the acquisition control part, and performs analysis processing and result display.

The embodiment also provides a detection method of the comprehensive nutrient metabolism tester, which comprises the following steps:

(I) before a subject starts measurement, the lower port and the right port of the four-way electromagnetic valve 15 and a valve of the low-concentration calibration gas cylinder 17 are opened, the other two ports of the four-way electromagnetic valve 15 are closed, the second air pump 20 performs air pumping treatment at a stable speed, gas in the low-concentration calibration gas cylinder 17 passes through the oxygen sensor 18 and the carbon dioxide sensor 19 respectively, low-concentration calibration on the oxygen sensor 18 and the carbon dioxide sensor 19 is completed after a period of time (3-10 minutes), and then the valve of the low-concentration calibration gas cylinder 17 and the second air pump 20 are closed; opening a valve of a high-concentration calibration gas cylinder 16, keeping the opening states of the upper port and the right port of the four-way electromagnetic valve 15, opening a second air pump 20 again to perform stable air pumping treatment, enabling the gas in the high-concentration calibration gas cylinder 16 to pass through an oxygen sensor 18 and a carbon dioxide sensor 19 respectively, completing high-concentration calibration of the oxygen sensor 18 and the carbon dioxide sensor 19 after a period of time (3-10 minutes) after ventilation, and closing each valve after the high-low gas concentration calibration is finished;

(II) opening a left port and a right port of the four-way electromagnetic valve 15 and a second air pump 20, respectively transmitting the air in the extracted test environment to an oxygen sensor 18 and a carbon dioxide sensor 19 by the second air pump 20, and respectively testing the average oxygen concentration and the carbon dioxide concentration of the air in the environment by the oxygen sensor 18 and the carbon dioxide sensor 19 after a period of time (3-10 minutes);

(III) before the testee enters the test chamber 1, the weight G of the chamber body is measured by the weighing sensor 3₁After the subject enters, the weighing sensor 3 measures the whole weight G of the in-out body and the cabin body again₂Opening the first valve 7, so that the subject can normally breathe in the body and is in a resting state; after a period of time (5-20 minutes), opening the upper port and the right port of the four-way electromagnetic valve 15, enabling the breathing gas of the subject to enter the damper 13 through the flow sensor 12 and then enter the air, and enabling the second air suction pump 20 to suck the breathing gas from the air pipe in the middle of the flow sensor 12 and the damper 13, enter the upper end of the four-way electromagnetic valve 15 and transmit the breathing gas to the oxygen sensor 18 and the carbon dioxide sensor 19; the flow sensor 12 measures the flow data of the exhaled gas, the gas concentration analysis part 9 periodically extracts the gas, the average concentration data of the oxygen and the carbon dioxide are measured, and the acquisition control part 10 collects and processes the measured data;

(IV) after the measurement of the gas part is finished, closing the first valve 7, opening the first air pump 14 to perform air extraction treatment for 30 seconds, and measuring the pressure in the test chamber to be P by the air pressure sensor 4_AOpening the second valve 6 to enable the gas between the two chambers to normally circulate, and after the calibration is stable for 3 minutes, measuring the pressure in the chamber to be P again by the pressure sensor 4 in the test chamber 1_BThe pressure in the balance chamber 5 is equal to the pressure in the test chamber 1 and is P_BThe acquisition control part 10 collects and processes the data;

(V) after receiving the data transmitted by the acquisition control device 10, the man-machine interaction part 11 carries out analysis and calculation and displays the measurement result in a report form;

(VI) the estimation process of the oxygen uptake and carbon dioxide output of the respiratory gas by the human-computer interaction part 11 is as follows:

volume of mixed gas discharged from test chamber:

nitrogen concentration in the mixed gas discharged from the test chamber: f_EN2＝1-F_ECO2-F_EO2

Nitrogen concentration in ambient air: f_IN2＝1-F_ICO2-F_IO2

Volume of air pumped into the test chamber: v_in＝V_out×F_EN2/F_IN2

Oxygen uptake: v_O2＝V_in×F_EO2-V_out×F_IO2

Carbon dioxide emission: v_CO2＝V_out×F_ICO2-V_in×F_ECO2

Wherein: v (t) is the instantaneous flow rate of the gas; t is t₁Is the time point at which sampling begins; t is t₂The time point of the end of sampling; f_ECO2Is the average carbon dioxide concentration in the mixed gas exiting the test chamber; f_EO2The average oxygen concentration in the mixed gas discharged from the test chamber; f_IO2Is the average oxygen concentration in the air being drawn; f_ICO2Is the average carbon dioxide concentration in the air drawn.

(VII) the human-computer interaction part 11 calculates the volume of the body fat and the non-fat as follows:

body weight of human body: g ═ G₂-G₁＝ρ₁V₁+ρ₂V₂

Total volume of human body: v is V₁+V₂

Test chamber internal volume: v_A＝V+V_B

The air extracting pump extracts air from the front two cabins: p_AV_B+P_{Big (a)}V_C＝nRT (1)

Two cabins after the air pump pumps air: p_BV_B+P_BV_C＝nRT (2)

The two formulas (1) and (2) can be obtained:

the total volume of the human body can be calculated as follows:

volume of fat in human body:

volume of non-fat in human:

wherein: rho₁Is the human body fat density; rho₂Is the non-fat density of the human body; v₁Is the body fat volume; v₂Is the non-fat volume; v_AIs the volume within the test chamber (known); v_BTesting the vacant volume in the cabin; v_CIs the equilibrium chamber volume (known); p_AFor testing the pressure, P, of the chamber after being evacuated_BAfter the test chamber is pumped, the pressure of the test chamber and the pressure of the balance chamber are tested.

The gas metabolism test in this embodiment is to calculate the energy consumption of the human body and the composition of three nutrients (carbohydrate, fat and protein) in the energy consumption according to the oxygen consumption and the carbon dioxide generation within a certain period of time by using the principle of indirect calorimetry, and can accurately measure the fat content and the non-fat content of the human body. Compared with a head cover type indirect energy test method, the test subject can freely move in the test chamber, and the test environment is relatively comfortable; the comprehensive nutrition metabolism tester can indirectly measure the body fat content and the non-fat content of a human body through the pressure variation in the test chamber and the balance chamber, thereby analyzing the influence of the body fat on energy consumption and ensuring accurate and reliable measurement results. Therefore, the comprehensive tester provides guidance on disease diagnosis, nutrition guidance and the like of the human body.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.