JP2016017899A - Health index calculation method, health index chart, health index calculation device, and health index calculation program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a health index calculation method capable of easily producing health indexes for individuals, a health index chart, a health index calculation device, and a health index calculation program.SOLUTION: A reference fat amount is calculated by multiplying a subject's reference weight based on a subject's height by a predetermined reference fat rate. With a value produced by subtracting the reference weight from a subject's weight assumed as a fat amount deviation from the reference fat amount, a fat amount is calculated by adding the deviation to the reference fat amount, and based on the fat amount, a health index is produced.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a health index calculation method, a health index chart, a health index calculation device, and a health index calculation program for calculating a health index such as a body fat percentage.

  In recent years, a health management apparatus such as a body fat scale that measures a body fat percentage by measuring a bioelectrical impedance of a subject is generally known (see, for example, Patent Document 1). In such a body fat scale, the correlation between the bioelectrical impedance and the body fat percentage at that time is calculated in advance based on statistical data, and the current living body of the body to be measured is measured by impedance measurement. By measuring the impedance, the statistical body fat percentage in the bioelectrical impedance is output as the current body fat percentage from the correlation based on the statistical data.

JP 2003-93363 A

  As described above, in the conventional health management device, since the health index (such as body fat percentage) is output using the current measurement value and the correlation based on the statistical data, the index based on the current measurement value However, it was not possible to see the changes over time. Although health indicators cannot show changes over time, health guidelines (overweight, overweight, etc.) from average values that do not depend on the subject itself can be shown, but health according to the individual Indices (weight change, fat mass change, body fat percentage change, etc.) could not be provided.

  The present invention has been made in view of such circumstances, and a health index calculation method, a health index chart, a health index calculation device, and a health index calculation program capable of easily providing a health index according to an individual The purpose is to provide.

  In order to solve the above problems, a health index calculation method according to an aspect of the present invention calculates a reference fat amount by multiplying a reference weight based on a subject's height by a predetermined reference fat rate, A value obtained by subtracting the reference weight from the examiner's weight is regarded as a deviation of the fat mass in the subject from the reference fat mass, and a value obtained by adding the deviation to the reference fat mass is calculated as the fat mass of the subject. By doing so, a health index based on the fat mass of the subject is calculated.

  According to the above method, the reference fat amount is calculated from the reference weight based on the height of the subject, and the value obtained by subtracting the reference weight from the subject weight is the deviation of the fat amount in the subject from the reference fat amount. By taking this into account, a health index based on the fat mass of the subject can be easily calculated from the height and weight.

  The reference weight may be a standard weight. The health index may be body fat percentage.

  The health index chart according to another aspect of the present invention has a height on a first axis, a weight on a second axis that intersects the first axis, a predetermined value on the first axis, and a predetermined value on the second axis. The health index calculated by the above-described health index calculation method using the value of each axis is described at the intersection with the value. According to the above chart, the health index can be easily checked from the height and weight of the user.

  The health index calculation apparatus according to another aspect of the present invention includes an input unit that inputs the height and weight of a subject, a reference weight based on the height input to the input unit, and the reference weight A reference fat amount calculation unit that calculates a reference fat amount by multiplying a predetermined reference fat percentage, and a value obtained by subtracting the reference weight from the weight input to the input unit in the subject from the reference fat amount A health index calculation unit that regards a deviation in fat mass, calculates a value obtained by adding the deviation to the reference fat mass as a fat mass of the subject, and calculates a health index based on the fat mass of the subject; It has.

  The health index calculation program according to another aspect of the present invention uses a computer to calculate a reference weight based on a height and weight acquisition unit that acquires the height and weight of a subject, and the height acquired by the height and weight acquisition unit. A reference fat amount calculation unit that calculates a reference fat amount by multiplying the reference weight by a predetermined reference fat percentage, and a value obtained by subtracting the reference weight from the weight acquired by the height and weight acquisition unit Considering the fat mass deviation in the subject from the fat mass, a value obtained by adding the deviation to the reference fat mass is calculated as the fat mass of the subject, and a health index based on the fat mass of the subject is calculated. It functions as a health index calculation unit.

  The present invention is configured as described above, and can provide a health index corresponding to an individual with a simple configuration.

FIG. 1 is an external view showing a health index calculation apparatus according to an embodiment of the present invention. FIG. 1A is a front view, and FIG. 1B is a side view. FIG. 2 is a block diagram showing a hardware configuration related to signal processing of the health index calculation apparatus shown in FIG. FIG. 3 is a flowchart showing a control flow of the health index calculation program according to the first modification of the present embodiment. FIG. 4 is a diagram showing an input screen used in the health index calculation program shown in FIG. FIG. 5 is a diagram showing an output screen used in the health index calculation program shown in FIG. FIG. 6 is a diagram illustrating a health index chart according to the second modification of the present embodiment.

<Summary of invention>
First, an outline of the present invention will be described.

  In conventional body fat scales, body fat percentage is obtained by combining the bioimpedance data of the body to be measured (subject) obtained by measurement with the statistical data (average value) of body fat percentage derived from the body type. However, such a conventional body fat scale has the following three major problems.

  The first problem is that many statistical elements are included in the calculation of the body fat percentage as described above. In many cases, this is not a problem in transient measurement. However, when it is desired to know a change in fat mass over time, such as a diet, correct information cannot be obtained, which is a big problem.

  Here, an example will be described in which a body under measurement having a body weight of 70 kg and a body fat percentage measured by an X-ray apparatus such as CT of 28% (that is, fat mass 19.6 kg) has been reduced by 10 kg. When the amount of fat in the body to be measured after weight reduction is measured with an X-ray device such as CT, the amount of fat often decreases by an amount substantially equal to the amount of change in body weight. That is, the amount of fat after weight loss is about 9.6 kg, and the body fat percentage at this time is 16%. However, since the conventional body fat scale does not reflect any information that the weight has been reduced from 70 kg to 60 kg, the body fat percentage is calculated based on the statistical value of the weight of 60 kg. As a result, in the conventional body fat scale, a display is made as if the body fat percentage after weight loss is 26.6% (the fat amount after weight loss is about 16 kg). Here, a measurement method (X-ray method) using an X-ray apparatus such as an X-ray CT apparatus is a method for obtaining fat mass from the X-ray absorption rate of the body of the measurement object, and includes statistical factors such as age and height. However, it has been established as a highly accurate measurement method.

  On the other hand, in the body fat scale using the conventional impedance method, it is understood that the dependence on the statistical element is high and the measurement of the fat mass is not accurate. In the first place, the impedance method can not directly measure fat that does not flow electricity (low water), but only indirectly estimates the amount of fat based on the lean mass of muscles with high water content. There is a limit to high-precision measurement. In addition, when the amount of moisture is changing temporarily, such as immediately after exercise or after bathing, the measured impedance value also changes greatly, so the results will vary greatly depending on the situation at the time of impedance measurement. There are many restrictions for accurate measurement.

  The second problem is that, in the measurement by the conventional body fat scale, the lean mass varies greatly due to the change in body weight. The composition of the human body can be broadly divided into two types: fat (amount) and non-fat lean (amount). In general adult men and women, most of the lean tissue is composed of invariant tissues such as organs, blood vessels, blood, and bones. Many. The lean tissue contains muscles (skeletal muscles) and body water, but in general life, the muscle composition rarely changes greatly (unless there is a sudden change in life). In addition, regarding body water, the circulating blood does not change following the change in body weight, except during abnormal times such as illness. Therefore, it is considered that the moisture does not change unless the muscle changes.

  As described above, in fact, the variation factor of the lean mass with respect to the change in body weight is overwhelmingly small in the same measured object. Nonetheless, the conventional body fat scale does not consider the past weight, so the fat mass is calculated with the fat mass at a certain point in the past significantly different from the current fat mass. The fat mass error is getting bigger.

  The third problem is that in the conventional body fat scale using the impedance method, the algorithm for incorporating statistical elements differs depending on the model or manufacturer, so the same body to be measured is measured with different body fat scales. However, a different result is output (an instrumental difference occurs for each body fat meter). This requires an algorithm in order to incorporate statistical elements, and there are various aspects of the algorithm, and there is a standard based on the weighing method for weight measurement, while measuring fat mass. The reason is that such a standard does not exist. As described above, body fat measurement using statistical elements is not accurate enough to follow changes over time, and it is considered that an algorithm that can be standardized as a standard cannot be established.

  Moreover, in such a body fat scale, since it is necessary to collect statistics in order to incorporate statistical elements in advance, it is necessary to change the algorithm itself incorporating statistical elements depending on gender and race. In particular, it is not easy to change the algorithm according to race, and it is not easy to produce a worldwide body fat scale using the impedance method. In addition, since a steep change in height is likely to occur in growing children and the like, and individual differences are large, statistical factors are difficult to apply, and the accuracy of body fat measurement for children cannot be increased.

  The inventors of the present invention have invented a health index calculation method capable of realizing both “exclusion of statistical elements” and “no change in lean body mass” as a result of intensive studies based on the above three problems. For gaining knowledge. That is, since the value obtained by subtracting the fixed lean mass from the body weight is the fat mass, the inventors of the present invention consider that “change in body weight = change in fat mass” is the most accurate calculation of fat mass. The knowledge that it becomes a formula was obtained. This is consistent with the fact that in the medical field, instruction is given to reduce weight in order to reduce body fat percentage.

  Furthermore, in order to calculate the health index more easily, if the reference fat percentage at the reference weight is calculated as the reference fat mass, the difference from the reference weight in the subject's weight is the fat mass from the reference fat mass. We obtained the knowledge that it can be regarded as a deviation.

  Based on such knowledge, the inventors of the present invention have invented the present invention. That is, in the health index calculation method according to an aspect of the present invention, a reference fat amount is calculated by multiplying a reference weight based on height by a predetermined reference fat rate, and the reference weight is calculated from the weight of the subject. The value obtained by subtracting the value obtained by subtracting the difference from the reference fat mass as the fat mass of the subject and calculating the value obtained by adding the deviation to the reference fat mass as the fat mass of the subject. The health index based on is calculated.

  According to the above method, the reference fat mass is calculated from the reference weight based on the height, and the value obtained by subtracting the reference weight from the weight is regarded as a deviation of the fat mass in the subject from the reference fat mass. A health index based on the fat amount of the subject can be easily calculated.

  Furthermore, by expressing the health index calculated by the above method in a chart with the height and weight as variables, the health index can be easily checked from the height and weight of the user.

<Embodiment>
Hereinafter, specific modes of a health index calculation method, a health index chart, a health index calculation device, and a health index calculation program according to embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout all of the drawings, and redundant description thereof may be omitted. Further, the following specific description merely illustrates the features of the present invention. For example, when the following specific examples are described with appropriate reference numerals attached to the same or corresponding terms as the terms specifying the health index calculation device, the specific components are the corresponding health It is an example of the component of an index calculation device. Therefore, the features of the health index calculation method, health index chart, health index calculation device, and health index calculation program are not limited by the following specific description.

  In addition, in the present specification and claims, not only humans but also animals other than humans (for example, pets such as dogs and cats, livestock animals such as pigs and cattle, Fish). Regarding animals, not only living organisms but also those after processing into meat and the like are included. Hereinafter, as an example, a health index calculation apparatus for calculating a health index of a human (hereinafter referred to as a subject) will be described.

<Overall structure>
As shown in FIGS. 1 and 2, the health index calculation device 10 mainly includes a main body 11 and a weight measurement unit 12. The main body unit 11 is provided with an operation unit 13 for performing an operation input of the health index calculation device 10, a display unit 14 for displaying various settings, displaying various measurement / calculation results, and a control unit 20. . The main body part 11 and the weight measuring part 12 are connected by a columnar support part 15. The support portion 15 is formed in a hollow shape, and a signal cable (not shown) for electrically connecting the control portion 20 provided in the main body portion 11 and the weight measuring portion 12 is passed through the support portion 15.

  The weight measuring unit 12 incorporates a load cell (not shown) for measuring the weight of the subject. When the subject is placed on the measurement surface 17 of the weight measuring unit 12 in order to measure his / her weight, the weight of the subject is detected by the load cell. Note that the data of the weight of the subject detected by the load cell is A / D converted after being amplified by an amplifier (not shown) in order to maintain the detection accuracy, and the control unit 20 (described later). To the information acquisition unit 21).

  The operation unit 13 is provided with various switches such as a power switch and an input switch for inputting subject information. The operation unit 13 is configured to be able to input the height of the subject or to set and input a reference fat amount to be described later. Furthermore, the weight may be input to the operation unit 13. Thereby, the health index can be calculated without necessarily measuring the body weight every time using the weight scale side part 12. The information that can be input through the operation unit 13 is not limited to the above, and may be configured to be able to input, for example, sex, age, and body type.

  The control unit 20 is a computer that performs calculations based on information from various measurement units and the operation unit 13, and includes, for example, a microprocessor. The control unit 20 includes an information acquisition unit 21 that acquires information input from various measurement units and the operation unit 13, and a storage unit 22 that includes a RAM, a ROM, and the like that store information input from the information acquisition unit 21 and calculation results. And a calculation unit 23 having a CPU or the like that performs a predetermined calculation based on various types of information.

  The information acquisition unit 21, the storage unit 22, and the calculation unit 23 are connected via a bus 24 so as to communicate with each other. In addition, a weight measurement unit 12 and an operation unit 13 are connected to the information acquisition unit 21. The display unit 14 is connected to the bus 24, and information acquired by the information acquisition unit 21 and information calculated by the calculation unit 23 are output to the display unit 14 via the bus 24. The storage unit 22 stores a health index calculation program 100 for performing various calculations, and the control unit 20 acquires various information based on the health index calculation program 100 and performs various calculations based on the information. .

  The storage unit 22 stores and stores various information obtained by the information acquisition unit 21. The memory | storage part 22 is comprised so that the said various information can be memorize | stored for every some subject. Thereby, the health index according to each of a plurality of subjects can be obtained with one device.

<Algorithm>
The health index calculation program 100 causes the control unit 20 that is a computer to function so as to calculate the health index of the subject. Specifically, the information acquisition unit 21 of the control unit 20 functions as a height / weight acquisition unit 211 that acquires height and weight. The calculation unit 23 functions as a reference fat amount calculation unit 231 and a health index calculation unit 232. The reference fat amount calculation unit and the health index calculation unit 232 calculate the fat amount of the subject of the subject from the height and weight of the subject based on the following algorithm.

The reference fat amount calculation unit 231 calculates a reference weight based on the height acquired by the height / weight acquisition unit 211, and calculates a reference fat amount by multiplying the reference weight by a predetermined reference fat rate. The standard weight is, for example, a standard weight. The standard weight (Ws [kg]) is obtained by Ws = L ² × 22 when the height acquired by the height / weight acquisition unit 211 is L [m]. The reference weight is not limited to this as long as it is obtained based on the height. For example, as the reference weight, the average weight according to height, healthy weight, values based on other calculation formulas, and those values multiplied by a predetermined coefficient according to sex, age, body type, etc. Various types can be adopted. The reference fat percentage is not particularly limited as long as it is a predetermined value. For example, the reference fat percentage (FPs) may be FPs = 0.2 (uniformly 20%). In addition, the standard fat percentage is variously adopted such as average fat percentage, health fat percentage, values based on other calculation formulas, and those values multiplied by a predetermined coefficient according to gender, age, body type, etc. Is possible.

The reference fat amount calculation unit 231 calculates the reference fat amount by multiplying the reference weight by the reference fat percentage. For example, according to the above example, the reference fat amount calculation unit 231 sets the reference fat amount to Fs [kg] = Ws × FPs = L ² × 22 × 0. 2 = calculated as 4.4L ^2. In this algorithm, the reference fat amount Fs is regarded as a reference fat amount (to be targeted) in the height L of the subject.

  The health index calculation unit 232 regards a value obtained by subtracting the reference weight from the weight acquired by the height / weight acquisition unit 211 as a deviation of the fat mass in the subject from the reference fat mass, and a value obtained by adding the deviation to the reference fat mass Is calculated as a fat amount of the subject, and a health index based on the fat amount of the subject is calculated. The health index calculation unit 232 uses the body weight obtained by the height-weight obtaining unit 211 (W [kg]) and the reference fat mass as the fat mass deviation (Df [kg]) in the subject from the standard fat mass Fs. The reference weight Ws calculated by the calculation unit 231 is calculated as Df = W−Ws.

  This deviation Df indicates the excess / deficiency of the subject's weight from the reference weight Ws, and in this algorithm, this excess / deficiency is regarded as the excess / deficiency of the subject's fat from the reference fat mass. ing. That is, the change in the subject's weight from the reference weight Ws is regarded as the change in the fat mass.

  Accordingly, the health index calculation unit 232 calculates the fat amount (F [kg]) of the subject by adding the deviation Df to the reference fat amount Fs calculated by the reference fat amount calculation unit 231. That is, the health index calculation unit 232 calculates the fat amount of the subject as F = Fs + Df = Fs + W−Ws.

In this embodiment, after the reference fat amount calculation unit 231 calculates the reference fat amount Fs as the intermediate generation value, the health index calculation unit 232 calculates the fat amount F of the subject using the reference fat amount Fs. Is configured to do. However, the present invention is not limited to this as long as the fat amount F of the subject is calculated based on the calculation of the above algorithm. For example, the control unit 20 may not calculate the reference fat amount Fs as the intermediate generation value. In this case, the control unit 20 may directly calculate the fat amount of the subject using, for example, F = Fs + Df = 4.4L ² + W−22L ² = W−17.6L ² . That is, the fat amount F of the subject may be calculated from a mathematical formula obtained as a result of the calculation based on the above algorithm using the height L and the weight obtained by the height / weight acquisition unit 211.

  The health index calculation unit 232 appropriately calculates a health index from the fat amount F of the subject calculated as described above. The calculated health index is displayed on the display unit 14. As a health index, for example, body fat percentage is included. The body fat percentage (referred to as FP) is obtained by the ratio of the fat amount F of the subject to the body weight W of the subject, that is, FP [%] = (F / W) × 100. The health index may be a value other than the body fat percentage, for example, a lean mass (WF), a lean mass ratio (100 × (WF) / W), or the like. The fat amount F of the subject may be output as it is as a health index. Further, as a health index, a level determination result as to which level is included may be displayed by dividing into a plurality of levels according to the size of the fat amount F of the subject. For example, if the difference between the body fat percentage FP of the subject and the reference fat percentage FPs is less than ± 2 points, “appropriate”, if the value is in the range of +2 to +5 points, “slightly fat”, if greater than +5 points The health index may be classified as “slightly fat”, “slightly lean” if the value is in the range of −2 to −5 points, and “slightly lean” if the value is less than −5 points.

  According to the above configuration, the reference fat amount Fs is calculated from the reference weight based on the height L of the subject, and the value obtained by subtracting the reference weight from the subject weight W is the fat amount in the subject from the reference fat amount. Therefore, the health index based on the fat amount F of the subject can be easily calculated from the height L and the weight W.

  Note that the calculated health index may be stored in the storage unit 22 together with the height and weight acquired at that time. Furthermore, statistics can be taken based on these pieces of information stored in the storage unit 22, and the history of each subject can be graphed.

  In the present embodiment, the health index calculation device 10 including the weight scale side unit 12 has been described, but a height measurement unit may be provided in addition to or instead of the weight scale side unit 12. That is, the health index calculation apparatus 100 may be configured by mounting the health index calculation program 100 on any measuring device such as a weight scale, a height scale, and a height scale.

<Modification 1>
In the above-described embodiment, the description is based on the health index calculation device 10 including the weight scale side part 12 (that is, the configuration in which the health index calculation device is incorporated in the weight scale). However, as long as the health index calculation method is used, It is not restricted to an aspect. That is, the configuration for measuring the weight and height is not always necessary.

  For example, in a calculator, a web page, a smartphone application, or the like, a health index calculation program that performs an operation based on the above algorithm may be executed. As shown in FIG. 3, when the program is started, first, an input screen 140 as shown in FIG. 4 is displayed on a display screen such as a monitor (step S1). In the example of FIG. 4, a touch panel such as a smartphone is provided with a weight input frame 141 and a height input frame 142 on such an input screen 140. The subject (user) inputs his / her weight in the weight input frame 141 and inputs his / her height in the height input frame 142. Specifically, each input frame 141, 142 is tapped, and the input to the tapped input frame is enabled. The number is input using the touch panel, and the height and weight are input to each input frame 141, 142. To do. In addition, in a display unit 14 such as a personal computer not provided with a touch panel, input is performed using an input operation device such as a mouse or a keyboard.

  Further, the input screen 140 is provided with a result display button area 143. When the subject taps the result display button area 143 after inputting the height and weight into the input frames 141 and 142, the health index calculation program causes the computer to display the height and weight acquisition unit 211, the reference fat amount. The health index is calculated by functioning as the calculation unit 231 and the health index calculation unit 232.

  Specifically, when the result display button area 143 is tapped, the height / weight acquisition unit 211 determines whether or not a weight is input in the weight input frame 141 (step S2). It is determined whether or not a height is input in the input frame 142 (step S3). If any input box is not input, or if the numerical value is not within a predetermined range, or if an input other than a number has been made, or if the input is not appropriate (No in step S2 or step S3), then again An input screen 140 is displayed to prompt appropriate input.

  When it is determined that an appropriate input is made in each input frame (both Yes in step S2 and step S3), the height / weight acquisition unit 211 acquires the height and weight information input in each input frame ( Step S4). Then, the reference fat amount calculation unit 231 and the health index calculation unit 232 calculate a health index based on the fat amount using the algorithm described above (step S5).

  The health index calculation program displays the output screen 144 on a display screen such as a monitor in order to display the calculation result of the health index (step S6). As shown in FIG. 5, health index display frames 145 and 146 are provided on the output screen 144. In the example of FIG. 5, the body fat percentage is displayed in the first health index display frame 145 as the first health index, and the level determination result (described above) corresponding to the body fat percentage is the second health index. It is displayed in the health index display frame 146. Note that the form of the output screen 144 is not limited to the example shown in FIG. 5, and only one health index may be displayed, and what kind of health index is displayed by the user. It is good also as a structure which can be switched.

  Thus, according to this modification, it is possible to easily obtain a health index such as a body fat percentage by simply inputting the height and weight without having any measuring instrument.

<Modification 2>
In the embodiment and the first modification described above, the aspect in which the computer (including the control unit) calculates the health index based on the input height and weight based on the algorithm has been described. However, the health index is calculated based on the algorithm. Only the health index results may be used.

  For example, the health index chart 110 shown in FIG. 6 takes height on the first axis (horizontal axis), weight on the second axis (vertical axis) that intersects the first axis, The health index (body fat percentage) calculated using the above algorithm using the value of each axis is described at the intersection 111 with the two axis predetermined values. This chart 110 may be printed on paper or the like, may be stored in a computer such as graph data, or may be uploaded on a network such as a web page. The arrangement of the first axis and the second axis in the chart 110 may be changed as appropriate.

  According to the chart 110, the health index of the subject can be obtained simply by reading the numerical values described in the intersection 111 where the height and weight of the subject intersect. Therefore, the health index can be easily examined from the height and weight of the subject without using any device.

  In the example of FIG. 6, the body fat percentage is described as the health index at the intersection 111, but other health indexes such as fat mass and lean mass may be described. Moreover, you may describe the numerical value which multiplied the coefficient according to sex and age to these values as a health index. That is, even with the same type of health index (for example, body fat percentage), a plurality of different health index charts may be created depending on gender and age. Further, the background color of the intersection may be changed according to the level division described above. For example, the intersection 111 included in the “appropriate” level has a green background, the intersection 111 included in the “slightly fat” level has a yellow background, and the intersection 111 included in the “fat” level is The background may be red.

  By displaying such a chart 110 in the vicinity of a weight scale or a height meter, a health index can be easily obtained by simply measuring the weight and height without performing separate impedance measurement or the like. Moreover, by posting in various places such as schools, facilities, production sites, etc., it is possible to easily grasp the health index at these places.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and modifications, and various improvements, changes, and modifications can be made without departing from the spirit of the present invention.

  The health index calculation method, health index chart, health index calculation device, and health index calculation program of the present invention are useful for providing a health index corresponding to an individual with a simple configuration.

DESCRIPTION OF SYMBOLS 10 Health index calculation apparatus 100 Health index calculation program 110 Health index calculation chart 111 Crossing part 211 Height weight acquisition part 231 Reference | standard fat amount calculation part 232 Basic health index calculation part

Claims (6)

Calculate the reference fat amount by multiplying the reference weight based on the height of the subject by a predetermined reference fat percentage,
The value obtained by subtracting the reference body weight from the body weight of the subject is regarded as the deviation of the fat mass in the subject from the reference fat mass, and the value obtained by adding the deviation to the reference fat mass is the fat mass of the subject. A health index calculation method for calculating a health index based on the fat amount of the subject by calculation.   The health index calculation method according to claim 1, wherein the reference weight is a standard weight.   The health index calculation method according to claim 1, wherein the health index is a body fat percentage.   Take the height on the first axis, the weight on the second axis that intersects the first axis, and use the value of each axis at the intersection of the predetermined value on the first axis and the predetermined value on the second axis A health index chart that describes the health index calculated by the health index calculation method according to claim 1. An input unit for inputting the height and weight of the subject;
A reference fat amount calculation unit that calculates a reference weight based on the height input to the input unit, and calculates a reference fat amount by multiplying the reference weight by a predetermined reference fat percentage;
A value obtained by subtracting the reference weight from the weight input to the input unit is regarded as a deviation in fat mass in the subject from the reference fat mass, and a value obtained by adding the deviation to the reference fat mass is determined by the subject. A health index calculation apparatus comprising: a health index calculation unit that calculates a fat index and calculates a health index based on the fat mass of the subject. Computer
Height and weight acquisition unit for acquiring the height and weight of the subject,
A reference fat amount calculation unit that calculates a reference weight based on the height acquired by the height and weight acquisition unit, and calculates a reference fat amount by multiplying the reference weight by a predetermined reference fat percentage; and the height weight The value obtained by subtracting the reference body weight from the body weight acquired by the acquisition unit is regarded as a fat amount deviation in the subject from the reference fat amount, and the value obtained by adding the deviation to the reference fat amount is the fat amount of the subject. A health index calculation program that functions as a health index calculation unit that calculates a health index based on a fat amount of the subject.

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