KR20030072820A - Portable Diet Management Machine with Body Fat Analyzer and Pedometer - Google Patents

Abstract

PURPOSE: A portable diet management device is provided to achieve improved use convenience and portability by integrating a body fat measurement function and a pedometer function. CONSTITUTION: A portable diet management device comprises conductive electrode plates(101,102,103,104) contacting palms of the hands of a user; a voltage measurement unit(106) for transmitting an alternating current obtained from the frequency of 50kHz and size of 800μA to the gap between the electrode plates(101,102) and measuring a voltage at the gap between the electrode plates(103,104); a key switch(112) for inputting physical information of the user; a micro control unit(110) for processing data input from a phase difference detection unit(108) and a pedometer sensor(107); a display unit(111) for displaying the processed data; and the pedometer sensor for calculating steps of the user.

Description

Portable Diet Management Machine with Body Fat Analyzer and Pedometer Function

The present invention is capable of diet management by integrating the body fat measurement function and the pedometer function by the bioelectrical impedance measurement method, in particular, it is portable and easy to operate.

Interest in obesity has recently increased, but there are many people who misunderstand the criteria for judging obesity. In fact, the important thing in obesity is not just body weight, but body fat mass, and the development of body fat analyzer is activated accordingly. Body fat, or body fat, is a key indicator of obesity. Patients who are nutritionally related, such as cancer patients or dialysis patients, can periodically measure the amount of muscle in their bodies to diagnose disease progression or therapeutic effects. It can also diagnose the growth or development of children or nutritional status of the elderly. In particular, in view of the current trend that has a lot of interest in obesity degree for the purpose of disease prevention and beauty, grasping the components of the body composition is the most basic examination of the human body is increasing the need.

As a method of analyzing body composition, a method of measuring bioelectrical impedance analysis, which is inexpensive and harmless to the human body, is widely used. The bioelectrical impedance method sends a weak alternating current into the human body to measure the electrical resistance or electrical impedance of the human body, inputs the height, age, sex, and weight of the subject, and then uses the measured values and the inputted information to measure body fluids. To calculate the amount, muscle mass, and body fat.

Looking at the example of a conventional method for analyzing body fat using impedance, as shown in Figure 1, the electrode is attached to the right hand and feet of the human body, the height, age, gender, and weight of the subject is input through a key switch, and measured The device measures the body's impedance, stores it in the microprocessor, calculates the body fat of the subject, and displays the result on the indicator. In such a measurement method, the process of attaching the electrode to the human body of the subject is difficult and inconvenient to carry. In addition, the conventional body fat analyzer has a disadvantage in that the subject cannot know about the treatment and coping method simply because it stops at the step of measuring body fat.

The present invention is to make the size of the body fat analyzer easy to carry in order to solve the above problems, so that the subject can always carry and measure, and the body fat meter and pedometer function by incorporating the function of measuring obesity and measuring calories It helps you manage your diet by showing the calories, obesity, and weight you need to lose or increase to get to your standard weight.

An object of the present invention is to provide an improved bioelectrical impedance measuring method and a diet management device that can solve the above problems of the prior art.

1 is a structural diagram of a conventional body fat analyzer.

Figure 2 is a schematic perspective view of a diet manager having four electrode plates using the bioelectrical impedance measurement method of the present invention.

Figure 3 is an electrical wiring diagram of the diet manager in the present invention.

4A, 4B, and 4C are flowcharts showing an example of a measurement process of the diet manager.

<Description of the code | symbol about the principal part of drawing>

105: 800 μ A, 50 kHz AC signal generator 106: voltage measuring unit

107: pedometer sensor 110: micro control unit

111: indicator unit 112: key switch

109: power supply unit 108: phase difference detection unit

101, 102, 103, 104: electrode plate

The configuration of the present invention will be described in detail with reference to the accompanying drawings.

1 shows the structure of a conventional body fat analyzer, which is inconvenient for the user to carry because of its large size and heavy weight, and uses the electrode attached to the skin. .

2 shows a diet manager using a portable bioelectrical impedance method, wherein conductive electrode plates 101, 102, 103, 104 for touching the left and right palms, respectively; A voltage measuring unit 106 for transmitting a current of 50 kHz and an alternating current having a size of 800 μA between the electrode plates 101 and 102 and reading the voltage difference between the electrode plates 103 and 104 to measure a voltage; A phase difference measuring unit 108 for measuring a phase difference between the AC signal and the measurement signal of the human body input signal; A key switch 112 for inputting the height, age, sex, and weight of the subject; A micro control unit 110 for processing data input from the measuring device and the input device; An indicator unit 111 for displaying the processed data; A power supply unit 109 for supplying power to the apparatus; It is characterized by consisting of a pedometer sensor 107 for calculating the number of steps.

The calculation step to calculate the amount of calories consumed per day by measuring body fat, calculating obesity, and calculating steps are performed as follows.

In order to calculate the degree of obesity, an alternating current of 50 kHz and 800 μA is sent between the electrode plates 101 and 102, and then the resistance component is calculated by measuring the voltage through the human body between the electrode plates 103 and 104. At the same time, the reactance component is calculated by measuring the phase difference between the AC signal input to the human body and the signal from the human body. The calculation process is as follows.

First, the resistance is calculated from the measured voltage and the input current. Next, calculate the reactance value by measuring the phase difference between the input 50 kHz sine wave and the measured sine wave.

Each variable is defined as follows.

V = voltage

I = current

R = resistance

Z = Impedance

X = Reactance

θ = phase difference

Human body composition (FFM: Fat Free Mass) can be calculated by inputting height, age, gender, and weight in the resistance and reactance calculated above. The formula is below.

Each variable is defined as follows.

H = height (cm)

R = resistance

X = Reactance

W = weight (Kg)

Sex = male: 1, female: 0

Age = age

Fat content and obesity can be calculated by the calculated FFM.

If you manage diet based on measured body fat, you need to calculate calories for diet management.

Based on the measured steps, you can calculate your daily calorie consumption.

Each variable is defined as follows.

C = amount of calories

1 / 1- α = 1.11

K _α = life activity index

W = weight (kg)

K _b = basal energy metabolic rate

n = 0.425 and α

In addition, the basic energy metabolism amount (Kb) can be obtained from the following equation.

Where each variable is defined as:

W = weight (kg)

H = height (cm)

Age = age

The life activity index ( K _α ) can be calculated according to age and gender as follows.

About men 26 years and older

About men under 26

About women over 21

About women under 21

Where each variable is defined as:

W = weight

Age = age

q = activity distance (steps x stride)

The stride length is determined by 37% of the height as the stride length. The calorie amount can be calculated by substituting the basic energy metabolic rate ( K _b ) and the activity index ( K _α ) into the calorie calculation formula.

In FIG. 3, the electrical wiring diagram of the impedance measuring device which consists of four electrode plates is shown in detail. The AC signal generator 212 forms a sine wave of 50 kHz and makes it a constant current source of 800 μA (205), which is supplied to the two electrode plates 201 and 202 and the body is held by the subject when the object is held by the hand. An alternating current signal is transmitted. The AC signal flowing through the body is input through the electrode plates 203 and 204, and the input signal is amplified by the differential amplifier 206 and passed through the rectifier 207 and the low pass filter 208 to the micro control unit 216. It is input to measure the voltage.

The phase difference between the signal generated by the AC signal generator and the signal input through the human body is measured 213 is input to the micro-control unit 216 to measure the impedance together with the measured voltage.

Using the signal from the pedometer sensor 214, the micro-control unit 216 calculates the number of steps by using the signal from the pedometer sensor 214 to calculate the calories and display it on the indicator unit 219.

The measurement procedure is as follows.

As shown in FIG. 3, the height, age, gender, and weight of the subject are input using the key switch 220, and then the subjects hold the four electrodes with both hands to measure impedance. The AC signal input electrode plates 201 and 202 of the impedance measuring apparatus 200 are electrically connected to the AC signal measuring electrode plates 203 and 204 to measure impedance of the human body.

Necessary information such as body composition (FFM: Fat Free Mass), obesity degree (% BF: Body Fat), calorie amount, etc., except the fat component by the microcontrol unit 216, from the stored human impedance, height, age, gender, and weight And the analyzed data is displayed on the indicator unit 219.

Figures 4a, 4b, 4c shows a flow chart of the process for body fat measurement and diet management. In FIG. 4A, when the power switch is turned ON (301), an initialization (302) is performed, and a step (303) of inputting height, age, gender, and weight is input. The values entered here remain even if the power is turned on or off until the user changes the values. After inputting the information of the subject, it is determined whether the electrode is connected to the subject's hand, and if not connected, it is instructed to connect 304. When the electrode is connected to the hand and the start switch is turned on, the subject measures the biosignal 311 after a predetermined time delay process to give the electrode a time to hold the electrode. After the measurement, it is judged whether the measured value is in the impedance measuring range (313). If it is out of range, go to FIG. 4B to display an error. If the measured value is within the range, go to FIG. 4C to read the value input by the subject with the key switch. (502) Calculate the human body composition (FFM: Fat Free Mass), fatness (% BF: Body Fat), calorie amount, etc., except for the fat component (503, 504). Finally, information such as obesity and calories is output (507).

The diet manager of the present invention has the feature that the subject himself can conveniently and easily measure the body fat even without a well-trained professional, and can display the required exercise amount and calories burned by actual exercise according to the analysis result. . Therefore, the present invention can calculate the obesity by measuring body fat, and based on this, it can play a role in leading a healthy and satisfactory life because it can prevent proper obesity recognition and adult diseases and other diseases. In addition, as life becomes more lucrative, beauty interests are increasing, so you can calculate the amount of calories you use every day, providing users with a systematic and scientific diet.

Claims (5)

Conductive electrode plates 101, 102, 103, 104 for contacting left and right palms; A voltage measuring device 106 for transmitting an alternating current adopted at a 50 kHz frequency and a size of 800 μA between the electrode plates 101 and 102 and measuring the voltage between the electrode plates 103 and 104; A key switch 112 for inputting the height, age, sex, and weight of the subject; A micro control unit 110 for processing data input from the phase difference detecting device 108 and the pedometer sensor 107; And an indicator unit (111) for displaying the processed data, wherein the analysis device further comprises a pedometer sensor (107) for calculating the number of steps of the subject. Electrode plate (101, 102, 103, 104) for transmitting the AC signal to the human body in claim 1, and grounding to the palm to measure the signal sent to the human body. The indicator unit (111) according to claim 1, wherein the analysis device displays the processed obesity and calories. The microprocessor and interface electronic circuit board (110) for processing data input from the measuring device in claim 1. Indicator method to display the amount of calories needed per day in claim 4 and displays the obesity degree after 2 seconds.