KR20030031246A - A method for measuring fat and physical exercise - Google Patents

Abstract

PURPOSE: A method for measuring body fat and momentum is provided to allow a user to easily measure body fat and momentum through the simple action of pressing the sensor attached to the watch of the user. CONSTITUTION: A method comprises a first step(S401) of storing information of a user; a second step(S403) of receiving a request on measurement of body fat from the user; a third step(S405) of supplying current to both electrodes of the measurement device, and measuring the body impedance of the user; a fourth step(S407) of extracting information stored in the first step, and calculating a body fat ratio by using the extracted information and the measured body impedance; and a fifth step(S409) of displaying the calculated body fat ratio on a display.

Description

A method for measuring fat and physical exercise

The present invention relates to a method and apparatus for measuring body fat using body impedance and measuring exercise amount using an acceleration sensor.

Measuring body fat is not easy. For experimental animals, tissue may be collected to directly calculate the percentage of body fat. However, the body fat of a living person cannot be measured in this way, so several indirect methods are used. Currently, the most widely used method of body fat analyzer is Bioelectrical Impedance Analysis. The bioelectrical impedance method is a technique for measuring body fat using an electrical method. Because this is a simple, fast and non-vascular method, it is used in many ways.

However, conventional body fat measurement products using the bioelectrical impedance method have had to use complicated devices attached to the device to measure body fat or apply an additive to the body.

In addition, the conventional body fat measuring device is expensive and large size was not popular.

The exercise amount measuring device may be equipped with an acceleration sensor to measure the amount of exercise so that the sensor responds to the movement of the body to measure the amount of exercise. Conventional exercise amount measuring method that is usually applied to the pedometer has a problem that can not measure the exact amount of exercise according to the strength of the exercise by displaying the counter by walking.

Accordingly, it is an object of the present invention to provide a method and apparatus for measuring body fat through the execution of a proprietary algorithm by simply pressing a sensor attached to a portable wrist watch.

Another object of the present invention is to provide an exercise amount measuring method and apparatus for calculating an amount of momentum by measuring a change in acceleration according to the movement of an arm through execution of a proprietary algorithm.

Still another object of the present invention is to provide an exercise amount measuring method and apparatus by which the user can accurately know the amount of exercise and exercise effect by calculating and providing calories consumed during exercise time to the user.

It is still another object of the present invention to provide a method and apparatus for measuring body fat and exercise amount based on a height, weight, and gender input by a user.

1 is a block diagram of a device for measuring body fat and exercise amount according to an embodiment of the present invention.

Figure 2 is a view showing the configuration of a watch having a function of measuring body fat and exercise amount according to an embodiment of the present invention.

3 is a view showing a body fat measurement site according to an embodiment of the present invention.

Figure 4 is a flow chart showing the body fat measurement process according to an embodiment of the present invention.

5 is a flowchart illustrating a process of executing a body fat measurement algorithm of the body fat measurement process according to an embodiment of the present invention.

6 is a view showing a change in the position of the pendulum according to the time and the angle of the pendulum according to an embodiment of the present invention.

Figure 7 is a view showing the motion and position of the pendulum according to an embodiment of the present invention.

8 is a view showing an acceleration change according to the angle of the pendulum according to an embodiment of the present invention.

9 is a view showing an acceleration change with time according to an embodiment of the present invention.

Figure 10 is a flow chart showing a momentum measurement process according to an embodiment of the present invention.

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

101: body fat and exercise measurement device

103 input unit 105 control unit

107: power supply unit 109: storage unit

111: LCD drive circuit 113: output unit

115: body fat sensor (+ electrode,-electrode) 117: DC current source

119: acceleration sensor 121: A / D conversion unit

123: key input unit 125: LCD display unit

According to an aspect of the present invention in order to achieve the above objects, in the wrist-watch type portable body fat measurement device having a positive electrode (+ electrode,-electrode), the band is installed on the wrist, request for body fat measurement from the user Input the current, supply the current to the positive electrode according to the body fat measurement request, measure the body impedance of the user, extract the pre-stored height, weight and gender corresponding to the user, the height, weight, gender And a body fat measuring method using a body impedance which calculates a body fat percentage according to a predetermined method using the body impedance and displays the body fat percentage on a display unit, an apparatus corresponding to the method, and a recording medium.

Computing the body fat ratio according to a predetermined method using the height, weight, gender and the body impedance is calculated using the height, weight, sex, length and cross-sectional area, the length, the cross-sectional area and the body impedance It may include the step of calculating the body fat ratio using.

The length may be preset or calculated for the height, weight, and gender.

The cross sectional area may be preset or calculated for the height, weight, and gender.

According to another aspect of the present invention in order to achieve the above object, in a wristwatch type portable exercise amount measuring device is installed on the wrist, the user receives an exercise amount measurement request from the user, the acceleration sensor is the movement of the user's arm To calculate an acceleration code according to the method, calculate an exercise amount using the acceleration code according to a predetermined method, and provide an exercise amount measuring method using an acceleration indicating the exercise amount on a display unit, an apparatus corresponding to the method, and a recording medium. have.

The exercise amount measuring method using the acceleration may further include calculating a calorie consumption corresponding to the height, weight, gender, and the exercise amount previously stored in accordance with the user, and displaying the calories burned on the display unit.

The calculating of the acceleration code according to the movement of the arm of the user by the acceleration sensor may further include calculating a time using the acceleration code.

The exercise amount measuring method using the acceleration may calculate an exercise amount corresponding to the time.

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

1 is a block diagram of a device for measuring body fat and exercise amount according to an embodiment of the present invention.

Referring to FIG. 1, the body fat and exercise amount measuring device 101 may include an input unit 103, a control unit 105, a power supply unit 107, a storage unit 109, an LCD driving circuit 111, an output unit 113, and the like. Consists of.

The input unit 103 includes a body fat sensor 115, a DC current source 117, an acceleration sensor 119, an A / D converter 121, and a key input unit 123. The output unit 113 includes an LCD display unit 125.

In order to measure body fat and exercise amount, user information such as height, weight and gender of the user must be input. The key input unit 123 inputs user information such as height, weight, gender, and the like by using input buttons 203, 205, 207, and 209 (see FIG. 2 below). Then, when the key input unit 123 receives it and transmits it to the control unit 105, the control unit 105 stores the user information in the storage unit 109.

1) body fat measurement

When the + electrode 115a (see FIG. 2 below) of the body fat sensor 115 is pressed by the user during the body fat measurement process, the DC current source 117 is connected to the + electrode 115a (see FIG. 2 below) and the −electrode 115b. (See FIG. 2 below) to flow a constant current to measure the body impedance value. The measured body impedance is converted to A / D through the A / D converter 121 and then transmitted to the controller 105.

The controller 105 calculates a body fat ratio by using user information such as height, weight, and gender stored in the storage unit 109 and the body impedance value. When the body fat ratio is calculated, the LCD driving circuit 111 displays the body fat ratio on the LCD display 125.

Hereinafter, an algorithm related to body fat measurement will be described.

The body fat calculation method begins with the theory that the electrical resistance R of a lead is proportional to the length L of the lead and inversely proportional to the cross-sectional area S. Here, the specific resistance ρ is a constant determined according to the type of material, and represents the unit length and the resistance value per unit area (Equation 1).

Equation 1

L: length of measurement site

S: cross section of the measurement site

The main components of the body are water, protein, body fat, and minerals (bones). The proportion of these components in body weight consists of approximately 55: 20: 20: 5, although there are gender and individual differences. When a weak alternating current flows through the body, electricity flows through highly conductive body water. However, since adipose tissue contains little moisture, the tissue itself is insulated, thus increasing resistance. This resistance is measured and the percentage of body fat in the body's proportion is calculated.

Body fat measurement area is a part that reaches the other hand through the chest when pressing the sensor with the other hand while wearing the wrist watch on one hand (see Figure 3).

The following assumptions are made to measure body fat.

Assumption 1: The specific resistance of body components is known.

Assumption 2: The ratio of body composition is as follows.

Equation 2

Moisture ratio

Moisture ratio

Moisture ratio

Moisture ratio

Assumption 3: The composition ratio of components excluding body fat is similar to the following.

Equation 3

Assumption 4: If you enter height, weight and gender, the ratio of arm length and chest size is constant.

L = arm length + chest size 4

Here, the arm length and the chest size may be set in advance with respect to height, weight, and gender and stored in a database. For example, for a man of height 175 and weight 70, arm length 122.5 and chest size 105 may be preset.

In addition, the arm length and chest size may be calculated by applying height, weight, and gender values to a predetermined calculation formula. The arm length calculation and the chest size calculation are, for example, as follows.

Arm length = (height + weight) * gender constant = (175 + 70) * 0.5

Chest size = (height + weight * gender constant) / 2

Here, the gender constant is 0.5 for men and 0.45 for women.

The user may correct the numerical values of the arm length and the chest size by using the menu button 203, the selection button 205, and the up / down movement buttons 207 and 209 of FIG. 2. If there is a difference from the normal figure.)

In addition, the user may directly input numerical values of the arm length and the chest size instead of the height, the weight, and the gender for calculating the arm length and the chest size. In this case, the controller 105 stores the input arm length and the chest size in the storage unit 109. When the body fat measurement request is input from the user, the controller 105 extracts the arm length and the chest size from the storage unit 109.

Assumption 5: If you enter height, weight, and gender, the ratio of arm thickness and chest cross-sectional area is constant.

S = cross section of arm + cross section of chest 5

Here, the cross-sectional area of the arm and the cross-sectional area of the chest may be preset for the height, weight, and gender and stored in a database.

In addition, the cross-sectional area of the arm and the cross-sectional area of the chest may be calculated by applying height, weight, and gender values to a predetermined calculation formula.

The user can correct the numerical values of the cross-sectional area of the arm and the cross-sectional area of the chest by using the menu button 203, the selection button 205, and the up / down moving buttons 207 and 209 of FIG. 2. The cross section of the chest is different from the normal body shape.)

In addition, instead of inputting height, weight, and gender for calculating the cross-sectional area of the arm and the cross-sectional area of the chest, the user may directly input numerical values of the cross-sectional area of the arm and the cross-sectional area of the chest. In this case, the controller 105 stores the input arm length and the chest size in the storage unit 109. When the body fat measurement request is input from the user, the controller 105 extracts the cross-sectional area of the arm and the cross-sectional area of the chest from the storage unit 109.

Assumption 6: The current flows at the shortest distance.

Equations 1 and 2 of the above assumptions lead to

Equation 6

Substituting Equation 3 into Equation 6 leads to the following equation.

Formula 7

In Eq 7, the ratio of body fat is calculated as follows.

Equation 8

In other words, substituting the measured length, cross-sectional area, and each variable into Equation 8 yields the ratio of body fat in the body.

2) momentum measurement

When the user sets the exercise mode using the menu button 203 (see FIG. 2 below) in the exercise amount measuring process, the acceleration sensor 119 built in the wristwatch-type exercise amount measuring device determines the acceleration code according to the arm movement. . Here, the acceleration code is converted into + and-as the arm movement direction changes according to the user's arm movement (similar to the movement of the pendulum). In addition, the acceleration sensor 119 A / D converts the measured acceleration code through the A / D converter 121 and transmits the converted acceleration code to the controller 105.

The controller 105 calculates an exercise amount using the acceleration code (S1207). When the exercise amount is calculated in this way, the LCD driving circuit 111 displays the exercise amount on the LCD display 125.

Hereinafter, the algorithm related to the exercise amount measurement will be described.

In order to measure the amount of exercise, the value measured by the acceleration sensor 119 is A / D converted through the A / D converter 121 and then transmitted to the controller 105. The momentum is calculated through execution of the momentum measurement algorithm calculated from the following assumptions.

First, let's organize our assumptions.

Assumption 1: Enter height, weight and gender.

Assumption 2: The calories consumed per step are constant for a given height, weight, and gender. In order to determine the movement of the human arm, the movement of the arm can be interpreted as the movement of the pendulum with a certain angle.

As shown in FIG. 7 below, the force f that the weight m tries to return when the distance from the additional center of mass m to the end of the pendulum is l to the string of length l as follows is given by Newton's second law as follows. (Eq. 9)

Equation 9

Where the acceleration is Equation 10

Therefore, substituting Equation 10 into Equation 9

Equation 11

Is derived. It can be seen from Equation 11 that the acceleration a is periodic by the angle θ.

2 is a view showing the configuration of a watch having a function of measuring body fat and exercise amount according to an embodiment of the present invention.

Referring to Figure 2, the watch 201 according to the present invention is provided with a positive electrode (115a and 115b, body fat sensor) on the body of the watch, and the wrist body type of portable body fat of the type having a band connected to the body and It is a momentum measuring device.

The main body is equipped with a menu button 203, a selection button 205, and up and down movement buttons 207 and 209. When the user presses the + electrode 115a while wearing the watch 201 on the wrist, the + electrode The body fat is measured as a current flows between the 115a and the −115b.

In addition, the clock 201 includes an acceleration sensor 119 capable of determining an acceleration code for a user's movement.

3 is a view showing a body fat measurement site according to an embodiment of the present invention.

Referring to FIG. 3, the body fat measuring part is a part that reaches the other hand through the chest when the body fat sensor 115 is pressed with the other hand while the wrist watch is worn on one hand.

When the user presses the body fat sensor 115, the DC current source 117 causes a current to flow. Then, the body impedance value for the body fat measurement part is measured, and the measured value is transmitted to the controller 105 through the A / D converter 121.

Figure 4 is a flow chart showing the body fat measurement process according to an embodiment of the present invention.

Referring to FIG. 4, a user inputs height, weight, gender, and gender by using input buttons 203, 205, 207, and 209. Then, the key input unit 123 receives this, and the control unit 105 stores the height, weight, and gender in the storage unit 109 (S401).

When the + electrode 115a is pressed by the user, the controller 105 recognizes the user's body fat measurement request (S403). In addition, the DC current source 117 flows a constant current to measure a body impedance value (S405) and transmits the measured value to the controller 105 through the A / D converter 121.

The controller 105 extracts a height, weight, and gender corresponding to the user from the storage 109. The controller 105 calculates the body fat ratio using the height, weight, gender, and the body impedance value through the equations described in FIGS. 4A and 4B (S407). When the body fat ratio is calculated as described above, the LCD driving circuit 111 displays the body fat ratio on the LCD (S409).

5 is a flowchart showing a process of executing a body fat measurement algorithm of the body fat measurement process according to an embodiment of the present invention.

Hereinafter, referring to FIG. 5, a process (S407) of calculating a body fat percentage through a body fat measurement algorithm using the height, weight, gender, and the body impedance value will be described in detail with reference to FIG. 5.

After reading the height, weight, and gender previously stored from the storage unit 109 (S501), the length L is calculated using the height, weight, and gender (S503). Here, the length L is calculated by Equation 4 in FIG.

The cross-sectional area S is calculated using the height, the weight, and the gender (S505). Here, the cross-sectional area S is calculated by Equation 5 of FIG.

When the length (L) and the cross-sectional area (S) corresponding to the user is calculated in this way, the body fat ratio is calculated by applying the same to Equation 8 of FIG. 1 (S507).

6 is a view showing a change in the position of the pendulum according to the time and the angle of the pendulum according to an embodiment of the present invention.

7 is a view showing the motion and position of the pendulum according to an embodiment of the present invention.

8 is a view showing an acceleration change according to the angle of the pendulum according to an embodiment of the present invention.

9 is a view showing an acceleration change with time according to an embodiment of the present invention.

6 to 9, the moving position of the pendulum, the acceleration according to the angle, and the acceleration according to time are shown in the table of 601.

As a result, the pendulum reciprocates once (S1-> S5), and if the sign of acceleration over time changes twice at the points T3 and T5, the pendulum reciprocates once. From this point of view, the pendulum's round trip is the change of the acceleration sign twice, the human arm moves twice, and this is a step.

In other words, it is possible to calculate the amount of exercise a person moves by determining the acceleration code over time.

In addition, since the calories burned per step are known through Assumption 2 of FIG. 7, the total calories burned during exercise may also be calculated.

10 is a flowchart illustrating a process of measuring an exercise amount according to an exemplary embodiment of the present invention.

Referring to FIG. 10, the height, weight, and gender input from the user are stored in the storage unit 109 (S1001). When the user sets the exercise mode using the menu button 203 (S1003), the acceleration sensor attached to the wristwatch-type exercise amount measuring device determines the acceleration code according to the arm movement (S1005). Here, the acceleration code is converted into + and-as the arm movement direction changes according to the user's arm movement (similar to the movement of the pendulum).

The controller 105 calculates an angle and an acceleration according to the motion according to the acceleration code, and calculates an exercise amount according to the execution of the exercise amount measurement algorithm as shown in Equation 11 (705) of FIG. 7 (S1007). Then, the LCD driving circuit 111 displays the measured momentum on the LCD (S1009).

Since the calories burned per step can be known from the hypothesis 2 of FIG. 7, the controller 105 calculates the total calories burned during exercise. Then, the LCD driving circuit 111 displays the calorie consumption on the LCD (S1011).

The present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention.

According to the present invention as described above, it is therefore an object of the present invention can provide a method and apparatus for measuring body fat through the execution of its own algorithm with a simple operation of pressing a sensor attached to a portable wristwatch.

In addition, according to the present invention, it is possible to provide an exercise amount measuring method and apparatus for calculating the momentum by measuring the change in acceleration according to the movement of the arm through the execution of a unique algorithm.

In addition, according to the present invention, by calculating the calories consumed during the exercise time is provided to the user, it is possible to provide a method and apparatus for measuring the exercise amount that the user can accurately know the exercise amount and the exercise effect.

In addition, according to the present invention, it is possible to provide a method and apparatus for measuring body fat and exercise amount based on a height, weight, and gender input by a user.

Claims (12)

In a wrist watch type portable body fat measurement device having a positive electrode (+ electrode,-electrode), and a band is installed on the wrist, Receiving a body fat measurement request from a user; Supplying a current to the positive electrode in response to the body fat measurement request; Measuring the body impedance of the user; Extracting a height, weight, and gender previously stored in correspondence with the user; Calculating a percentage of body fat according to a predetermined method using the height, weight, gender and the body impedance; And Displaying the body fat percentage on a display unit; Body fat measurement method using a body impedance comprising a. The method of claim 1, Calculating a body fat percentage according to a predetermined method using the height, weight, gender and the body impedance Calculating length and cross-sectional area using the height, weight, and gender; And Calculating the ratio of body fat using the length, the cross-sectional area, and the body impedance Comprising Body fat measurement method using the body impedance, characterized in that. The method of claim 2, The length is Preset or calculated for said height, weight and gender Body fat measurement method using the body impedance, characterized in that. The method of claim 2, The cross section is Preset or calculated for said height, weight and gender Body fat measurement method using the body impedance, characterized in that. In a wristwatch type portable exercise device, in which a band is installed and worn on the wrist, Receiving an exercise amount measurement request from a user; Calculating, by an acceleration sensor, an acceleration code according to the movement of the user's arm; Calculating an amount of exercise in accordance with a predetermined method using the acceleration code; And Displaying the exercise amount on a display unit Momentum measurement method using an acceleration comprising a. The method of claim 5, The exercise amount measuring method using the acceleration Calculating calories burned corresponding to the height, weight, gender, and the amount of exercise previously stored in accordance with the user; And Displaying the calories burned on the display unit Containing more How to measure the amount of exercise using acceleration. The method of claim 5, Computing the acceleration code according to the movement of the arm of the user by the acceleration sensor Calculating a time using the acceleration code Containing more How to measure the amount of exercise using acceleration. The method of claim 7, wherein The exercise amount measuring method using the acceleration Calculating the amount of exercise corresponding to the time How to measure the amount of exercise using acceleration. It is a wrist watch type portable body fat measurement device having a positive electrode (+ electrode,-electrode), and a band is installed on the wrist. Means for receiving a body fat measurement request from a user; Means for supplying a current to the positive electrode in response to the body fat measurement request; Means for measuring the body impedance of the user; Means for extracting a prestored height, weight, and gender corresponding to the user; Means for calculating a body fat percentage according to a predetermined method using the height, weight, gender and the body impedance; And Means for displaying the body fat percentage on a display unit Body fat measurement apparatus using a body impedance having a. A wrist watch type portable exercise amount measuring device that a band is installed and worn on a wrist, Means for receiving an exercise amount measurement request from a user; Means for calculating, by an acceleration sensor, an acceleration code according to the movement of the user's arm; Means for calculating an amount of exercise in accordance with a predetermined method using the acceleration code; And Means for displaying the momentum on a display unit Momentum measurement device using an acceleration having a. In the recording medium which is tangibly embodied and program of instructions which can be executed by the digital processing apparatus for performing the body fat measurement method using the body impedance, Body fat measurement method using the body impedance, Receiving a body fat measurement request from a user; Supplying a current to the positive electrode in response to the body fat measurement request; Measuring the body impedance of the user; Extracting a height, weight, and gender previously stored in correspondence with the user; Calculating a percentage of body fat according to a predetermined method using the height, weight, gender and the body impedance; And Displaying the body fat percentage on a display unit; Recording medium comprising a. In the recording medium which is tangibly embodied and can be read by the digital processing device, the program of instructions that can be executed by the digital processing device for performing the momentum measurement method using the acceleration, The exercise amount measuring method using the acceleration, Receiving an exercise amount measurement request from a user; Calculating, by an acceleration sensor, an acceleration code according to the movement of the user's arm; Calculating an amount of exercise in accordance with a predetermined method using the acceleration code; And Displaying the exercise amount on a display unit Recording medium comprising a.