JP6018058B2 - Body moisture meter and method of operating the same - Google Patents

Description

The present invention relates to an in-vivo moisture meter for measuring moisture in a living body of a subject and an operating method thereof.

  It is important to measure the moisture in the subject's living body. Dehydration in the living body is a condition in which water in the living body decreases, and it often develops daily, especially when exercising when a lot of water is discharged from the body due to sweating or rising body temperature, or when the temperature is high It is. In particular, it is said that elderly people are more likely to cause dehydration than ordinary healthy people because the water retention ability of the living body itself is often lowered.

  In general, when you become elderly, the muscles that accumulate water decrease, the amount of urine increases due to a decrease in kidney function, the lack of sensation makes it difficult to notice dry mouth, and the water required in the cell Or less. If this dehydration symptom is left untreated, the dehydration symptom may trigger a serious symptom. Similar dehydration is also observed in infants. Infants have a lot of water, but they are unable to complain of hydration themselves and may cause dehydration due to delays in parents' awareness.

  Usually, it is said that the body temperature regulation is impaired when the body water is lost by 3% or more of the body weight. The body temperature regulation disorder causes the body temperature to rise, and the body temperature rise further increases the body water. It falls into a vicious circle that causes a decrease in the number of people, and eventually it leads to a disease state called heat stroke. Heat stroke has pathological conditions such as heat convulsions, heat fatigue, and heat stroke, and sometimes systemic organ damage sometimes occurs. By accurately grasping dehydration, the risk of heat stroke can be avoided in advance. It is desirable to be able to do this.

  As a device for grasping dehydration symptoms, a device that measures human body impedance with a device that holds a handle with both hands and calculates a moisture content from the measurement result is known (Patent Document 1). In addition, an apparatus that easily measures skin moisture by pressing a sensor on the skin has been proposed (Patent Document 2).

JP 11-318845 A JP 2003-169788 A

  However, the moisture meter in the body described in Patent Document 1 requires that the subject himself / herself grasps the handle with both hands. Not suitable. That is, with the structure of the moisture meter in the body described in Patent Document 1, it is difficult to measure the amount of moisture in the body of an infant or a subject who has suffered a disturbance of consciousness.

  On the other hand, the skin moisture meter as described in Patent Document 2 is intended to check the so-called moisture of the skin, and the moisture content in “dry skin” and the moisture content in the body in “dehydration” are measured. The level of physical quantity to be played is quite different. Therefore, a skin moisture meter that checks the degree of skin moisture affected by the humidity of the outside air cannot be used as a moisture meter in the body for determining dehydration as described above.

  On the other hand, when measuring the amount of water in the body from the body surface as described above, it is necessary to measure at a site that is not easily affected by the humidity of the outside air, through the skin in the mouth or armpit It is preferable to perform the measurement. In particular, when the examiner tries to measure the moisture in the body of the subject, measurement through the skin of the armpit is considered realistic. Thus, when it is going to implement | achieve the moisture content measurement under the armpit, the magnitude | size and weight of a moisture meter in a body are restrict | limited severely, For example, the moisture meter in a body as a structure as described in patent document 1 cannot be utilized.

  Due to the downsizing of the moisture meter in the body, the display unit for displaying the measurement result is also downsized. The amount of water is displayed in units of “%” and “Kg”, but unlike the body temperature, the value is not familiar to general users. It is difficult to intuitively grasp what state is (for example, dehydrated state) and what kind of treatment is necessary. In patent document 1, the measurement result of the past water content is displayed as a graph together with the average water content so that changes in the body water content can be recognized. However, in order to perform such graph display, the display unit needs to have a certain size, and it is difficult to apply it to the display of the moisture meter in the body that is required to be downsized.

  The present invention has been made in view of the above problems, and an object thereof is to provide a moisture meter in the body and a display control method thereof that can intuitively and easily grasp the state of the moisture content in the body of the subject. To do.

In order to achieve the above object, a body moisture meter according to one aspect of the present invention comprises the following arrangement. That is,
Measuring means for measuring the moisture content of the subject;
Display means for displaying the current amount of water measured by the measuring means;
A determination means for determining whether the subject is in a dehydrated state or a non-dehydrated state based on the amount of water at this time
Holding means for holding the current water amount and the determination result of the determining means for the current water amount as measurement information;
Based on the previous moisture amount obtained from the previous measurement information held in the holding means and the previous determination result as to whether or not the dehydration state is present, and the current moisture amount and the current determination result by the determination means. And changing means for changing the display form of the display means.

  According to the present invention, it is possible to intuitively and easily grasp the state of the moisture content in the body of a subject.

  Other features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings. In the accompanying drawings, the same or similar components are denoted by the same reference numerals.

The accompanying drawings are included in the specification, constitute a part thereof, show an embodiment of the present invention, and are used to explain the principle of the present invention together with the description.
It is a figure which shows the external appearance of the moisture meter in a body by embodiment. It is a block diagram which shows the function structure of the moisture meter in a body by embodiment. It is a block diagram explaining the measurement circuit of the moisture meter in a body by an embodiment. It is a flowchart explaining operation | movement of the moisture meter in a body by embodiment. It is a flowchart explaining operation | movement of the moisture meter in a body by embodiment. It is a figure explaining holding | maintenance of the measurement information by memory. It is a figure explaining selection of the display form according to a measurement result. It is a figure explaining selection of the display form according to a measurement result. It is a figure explaining selection of the display form according to a measurement result. It is a figure explaining selection of the display form when the last measurement result is invalid or when the last measurement result does not exist.

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

  Drawing 1 is a figure showing an example of the appearance of moisture meter 100 in a body by an embodiment. The moisture meter 100 in the body detects the amount of moisture in the body of the subject by bringing the end portion into contact with the skin of the subject and detecting a physical quantity corresponding to the electric signal supplied at the end portion. In the in-vivo moisture meter 100 of the present embodiment, an end is brought into contact with the subject's heel and the capacitance of the subject's skin is detected as a physical quantity to detect the wetness of the skin under the heel. Estimate and detect moisture content. The physical quantity detected for measuring the amount of water in the body is not limited to the capacitance, and for example, impedance measured by supplying a constant voltage or constant current to the subject can also be used.

  In the in-vivo moisture meter 100, the main body 101 is provided with various user interfaces and an electronic circuit for measuring the in-body moisture content. As a user interface, a power switch 102 and a display unit 103 are provided. When the power switch 102 is turned on, power supply from the power supply unit 211 (FIG. 2), which will be described later, to each part of the moisture meter 100 in the body is started, and the moisture meter 100 in the body enters an operating state. The display unit 103 displays the current moisture content measurement result 1031 together with the previous moisture content measurement result 1032. In the display unit 103, the display form is changed based on the current measurement result and the current measurement result. In the present embodiment, the background color in the display unit 103 is changed. Further, in the display unit 103, the battery display unit 1033 notifies the user of the remaining amount of the battery (the power supply unit 211 in FIG. 2). When an invalid measurement result is obtained or when a measurement error is detected, the display unit 103 displays “E” to notify the user to that effect.

  The main body 101 is provided with a sensor unit 110 slidable in the directions of arrows 1101a and 1101b. The sensor unit 110 is urged in the direction of an arrow 1101a by a spring (not shown) in order to ensure a pressing pressure for ensuring the close contact of the sensor head 111 with the skin (for example, an urging force of about 200 g). The measurement is started when the sensor head 111 is pressed against the skin and the sensor unit 110 is moved in the direction of the arrow 1101b by a predetermined amount (for example, 1 mm to 10 mm, in this embodiment, 5 mm). For example, when it is detected that the user turns on the power switch 102 to activate the moisture meter 100 in the body and presses the sensor head 111 against the subject's skin for a predetermined time (for example, 2 seconds or more), Measurement of water content is started. For example, the user turns on the power switch 102 to activate the moisture meter 100 in the body, and puts the sensor head 111 on the subject's skin with a predetermined load (for example, 100 gf to 300 gf, more preferably 150 gf to 250 gf, 200 gf in this embodiment). ) When it is detected that it has been pressed, measurement of the amount of water in the body is started. With this mechanism, the degree of adhesion of the sensor head 111 to the skin during measurement is made constant.

  An electrode is laid on the contact surface of the sensor head 111 attached to the tip of the sensor unit 110 with the subject, and a protective film is provided so as to cover the electrode. The contact surface of the sensor head 111 may have a flat shape or a convex curved shape. An example of the shape of such a contact surface is a part of a spherical surface (for example, a spherical surface having a radius of 15 mm).

  FIG. 2 is a block diagram illustrating a functional configuration example of the moisture meter 100 in the embodiment. In FIG. 2, the control unit 201 includes a CPU 202 and a memory 203, and the CPU 202 executes various programs in the body moisture meter 100 by executing a program stored in the memory 203. For example, the CPU 202 executes display control of the display unit 103, which will be described later with reference to the flowcharts of FIGS. 4A and 4B, drive control of the buzzer 222 and the LED lamp 223, measurement of the moisture content in the body (capacitance measurement in the present embodiment), and the like. . The memory 203 includes a nonvolatile memory and a volatile memory. The nonvolatile memory is used as a program memory, and the volatile memory is used as a work memory for the CPU 202.

  The power supply unit 211 has a replaceable battery or a rechargeable battery, and supplies power to each part of the moisture meter 100 in the body. The voltage regulator 212 supplies a constant voltage (for example, 2.3 V) to the control unit 201 and the like. The battery remaining amount detection unit 213 detects the remaining amount of the battery based on the voltage value supplied from the power supply unit 211 and notifies the control unit 201 of the detection result. The control unit 201 controls the display of the battery display unit 1033 based on the remaining battery level detection signal from the remaining battery level detection unit 213.

  When the power switch 102 is pressed, power supply from the power supply unit 211 to each unit is started. When the control unit 201 detects that the power switch 102 has been pressed by the user for one second or longer, the control unit 201 maintains the power supply from the power supply unit 211 to each unit, and sets the moisture meter 100 in the body to an operating state. As described above, the measurement switch 214 is turned on when the sensor unit 110 is pushed a predetermined amount or more in the direction of the arrow 1101b. When the ON state of the measurement switch 214 continues for a predetermined time (for example, 2 seconds), the control unit 201 starts measuring the moisture content. In addition, in order to prevent the consumption of the power supply unit 211, if the measurement does not start even after 5 minutes have passed since the in-vivo moisture meter 100 is in an operating state, the control unit 201 automatically turns on the in-vivo moisture meter 100. Transition to the off state.

  The measurement circuit 221 is connected to the sensor head 111 and measures the capacitance. FIG. 3 is a diagram illustrating a configuration example of the measurement circuit 221. A CR oscillation circuit is formed by the operational amplifiers 301 and 302, the resistors 303 and 304, and the subject capacitor 310. Since the oscillation frequency of the output signal 305 is changed by the subject volume 310, the control unit 201 estimates the subject volume 310 by measuring the frequency of the output signal 305. In the sensor head 111 of the present embodiment, for example, two comb-shaped electrodes are arranged so that the respective comb teeth are alternately arranged, but the present invention is not limited to this.

  Returning to FIG. 2, the display unit 103 performs the display as described in FIG. 1 under the control of the control unit 201. The buzzer 222 sounds when the measurement starts when the sensor unit 110 is pressed or when the measurement of the moisture content in the body is completed, and notifies the user of the start or completion of the measurement. The LED lamp 223 also performs the same notification as the buzzer 222. That is, the LED lamp 223 is turned on when the measurement is started by pressing the sensor unit 110 or when the measurement of the moisture content in the body is completed, and notifies the user of the start or completion of the measurement. The timer unit 224 operates by receiving power supply from the power supply unit 211 even when the power is off, and notifies the control unit 201 of the time in the operation state.

  The operation of the moisture meter 100 in the present embodiment having the above-described configuration will be described with reference to the flowcharts of FIGS. 4A and 4B. In the moisture meter 100 in the present embodiment, the background color of the display unit 103 is changed by referring to the measured moisture content in the body and the moisture content measured in the previous time, and the user can calculate the moisture content in the body from the measured moisture content in the body. Support the appropriate judgment and treatment.

  In step S401, the control unit 201 detects a measurement start instruction. In this example, the state of the measurement switch 214 is monitored, and it is determined that the measurement start instruction has been detected when the measurement switch 214 remains on for 2 seconds or longer. When the control unit 201 detects an instruction to start measurement, in step S402, the control unit 201 measures the frequency of the oscillation signal from the measurement circuit 221 to calculate the body water content of the subject. In step S403, the control unit 201 determines whether or not the subject is dehydrated based on whether or not the amount of water in the body estimated in step S402 exceeds a predetermined threshold. The threshold value in this case is preferably a value corresponding to 25% when water is 100% and air is 0%.

  In step S404, the control unit 201 acquires the previous measurement information from the memory 203, and determines the validity of the previous measurement information. In the memory 203, for example, at least the measurement result of the water content in the body (previous measurement result) executed immediately before is stored as measurement information having a data structure as shown in FIG. In FIG. 5, a measured value 501 is the amount of water in the body measured in step S402 at the previous measurement. The determination result 502 is information indicating whether the dehydration state or the non-dehydration state is obtained in step S403 at the previous measurement. The measurement time 503 is information indicating the time notified from the time measuring unit 224 in the previous measurement. The measurement time 503 can be, for example, the time notified from the time measuring unit 224 when the measurement is performed in step S402.

  The control unit 201 acquires the elapsed time from the previous measurement from the measurement time 503 included in the measurement information and the current time notified from the time measuring unit 224, and whether the measurement information is valid based on this elapsed time. Judge whether or not. For example, if the elapsed time does not exceed a threshold value (for example, two weeks), the control unit 201 determines that the measurement information is valid. Actually, when a serious dehydration occurs, the dehydration after 10 days may be captured. In addition, if it is not measured for more than half a month (two weeks), it may be determined that the moisture content is not measured. Therefore, in this embodiment, when the elapsed time from the previous measurement is two weeks or more, the previous measurement value is determined to be invalid. For example, when the previous measurement value is not stored, such as when the moisture meter 100 in the body is used for the first time, it is determined that the previous measurement value is invalid.

  Further, a lower limit threshold value may be set in the determination of the effectiveness in step S404, and if the elapsed time from the previous measurement does not exceed the lower limit threshold value, the previous measurement value may be determined to be invalid. . For example, if you are in a mildly dehydrated state, you can eliminate dehydration in a few hours after rehydration, but if you are in a severely dehydrated state, even if you are infused for a few hours Then dehydration is not eliminated. For this reason, the lower limit threshold is preferably 2 hours or more at which dehydration may be eliminated, more preferably 6 hours or more in consideration of a severe dehydration state. Also, for example, the lower limit threshold is 6 hours in the case of severe dehydration with a water content of 15% or less, and the lower limit threshold is 2 hours in the case of mild dehydration of 15-30%. The lower limit value may be switched based on the measured value or the previous state determination. Similarly, the upper threshold value may be changed based on the previous measurement value or the previous state determination.

  If it is determined that the measurement information is invalid (or there is no previous measurement result), the process proceeds from step S405 to step S406. In step S406, the control unit 201 sets the display form of the display unit 103 using only the current measurement information. For example, as a result of the measurement of the amount of moisture in the body this time, when it is determined that it is dehydrated, the background color of the display unit 103 is red, and when it is determined that it is non-dehydrated, the background color of the display unit 103 is Set to blue. Note that the previous measurement value 1032 may be notified to the user as a predetermined display, such as “--.-”, indicating that the previous moisture content measurement result 1032 is invalid.

In addition, the setting of the display form is not limited to such an example. For example, when the non-dehydrated state is close to the dehydrated state, that is, when the amount of water in the body falls below a predetermined threshold, the background Various modifications, such as setting the color to yellow, are possible. The threshold value in this case is preferably a value corresponding to 25% to 35% when water is 100% and air is 0%. Further, even when it is determined to be dehydrated, the background color of the display may be switched based on the measured amount of water, such as yellow if it is mild and red if it is severe. An example of such display mode switching is shown in FIG. In the example of FIG. 7, whether the dehydrated state is determined is based on whether or not the water content is 20% or more, but when the water content is 15% or more and less than 30%, a yellow background color is selected. . That is,
-Moisture content is less than 15% (serious dehydration) → Set the background color to red,
・ Moisture content 15% or more and less than 30% (lightly dehydrated or nearly dehydrated) → Set the background color to yellow,
・ Moisture content is 30% or more (good non-dehydrated state) → Background color is set to blue.

  On the other hand, if the measurement information is valid, the process proceeds from step S405 to step S407. In steps S407 to S412, the control unit 201 sets the display form of the display unit 103 (in this embodiment, the background color of the display unit 103) based on the current measurement result and the previous measurement result.

  In step S407, the control unit 201 determines whether or not the current measurement result is a non-dehydrated state. If the current measurement result is in the non-dehydrated state, the process proceeds to step S410, and the control unit 201 determines that the subject is in a good state (first state) that is not in the non-dehydrated state, and the display unit 103 Set the background color of to blue. In this case, in this example, the state (whether or not it is a dehydrated state) indicated by the previous measurement result does not matter.

  On the other hand, if it is determined in step S407 that the current measurement result is a dehydrated state, the process proceeds to step S408. In step S408, the control unit 201 determines whether the determination result 502 by the previous measurement is a dehydrated state or a non-dehydrated state from the measurement information read from the memory 203 in step S404. If the determination result 502 by the previous measurement is the non-dehydrated state, the process proceeds to step S411. In step S411, the control unit 201 determines that the subject is in a state (second state) to be warned that the subject is dehydrated, and sets the background color of the display unit 103 to red.

  In step S408, when the previous determination result 502 indicates the dehydrated state, the process proceeds to step S409. In step S409, the control unit 201 reads the previous measurement value 501 from the measurement information read from the memory 203 in step S404, and compares it with the moisture amount that is the current measurement result. If the current amount of water is greater than the previous amount of water, the subject is in the direction of improvement with respect to the amount of water in the subject but is still in a dehydrated state, so a warning should be given that the subject is in a dehydrated state. Judgment is in the state of 2. Therefore, the process proceeds from step S409 to step S411, and the background color of the display unit 103 is set to red as described above.

  In step S409, if the current water content is less than or equal to the previous water content, the process proceeds to step S412. In step S412, the control unit 201 determines that the subject is in a dehydrated state following the previous time and that the symptom is worsening (third state), and the background of the display unit 103 is red. Set to blinking state.

FIG. 6A shows the setting of the display form of the display unit 103 in steps S407 to S412 described above. 6A to 6C, “Previous” indicates the previous measurement value (water content), and “Now” indicates the current measurement value (water content). That is,
・ If this time is determined to be non-dehydrated → First state → Blue background color ・ If the previous time is non-dehydrated and this time is determined to be dehydrated → Second state → Red background color If the water content in the body is increasing → second state → red background color ・ When the water content in the body is decreasing the previous time and this time, the third state → background The color is flashing red,
It becomes.

  As described above, when the display form is set, in step S413, the control unit 201 measures the measurement value (in-body water content) obtained in step S402, the determination result obtained in step S403, and the measurement in step S402. The measurement information in the memory 203 is overwritten at the time when the value is acquired. Note that the method of holding measurement information is not limited to such overwriting. For example, measurement information for a predetermined number of times may be held. In step S414, the control unit 201 displays the current measurement value (water content) and the previous measurement value (water content) using the display form set in any of steps S406 and S410 to S412. 103. For example, the control unit 201 displays the set background color on the display unit 103 and displays the current measurement value (water content) and the previous measurement value (water content) as shown in FIG. However, if it is determined in step S405 that the previous measurement information is invalid, the previous measurement value is not displayed.

  FIG. 1 shows an example in which the previous measurement value and the current measurement value are simultaneously displayed on the display unit 103, but the present invention is not limited to this. For example, the previous measurement value and the current measurement value may be displayed alternately. At this time, the display may be automatically switched at a predetermined interval, or the display may be switched every time a predetermined operation input such as pressing the power switch 102 is performed.

  The display mode setting (FIG. 6A) described above is an example, and the present invention is not limited to this. For example, the display form as shown in FIG. 6B or 6C may be set. In the table, [Previous-Now] indicates a value obtained by subtracting the current measurement value (water content) from the previous measurement value (water content).

  In FIG. 6B, the first state is further divided based on the difference between the previous measurement value and the current measurement value (water content). That is, if the value obtained by subtracting the current measurement value from the previous measurement value is smaller than the threshold value Th, the amount of water is increased or equal to the previous value, or decreased, but the decrease amount is more than the threshold value Th. Since the water content is small, the background color is set to blue on the assumption that the water content is in a stable and stable state. On the other hand, if the value obtained by subtracting the current measurement value from the previous measurement value is equal to or greater than the threshold Th, the background color is set to yellow because the amount of decrease in the water amount reaches the threshold Th or more and tends to be reduced. . Alternatively, when the amount of water at this time is equal to or less than a predetermined value, the background color may be set to yellow because there is a possibility that the dehydration state is being reached. The above processing can be realized by referring to the current measurement information and the previous measurement information in step S410. In the second state, if the previous time was a non-dehydrated state, the background color is blinking yellow because it is just dehydrated. Such setting can be performed in step S411.

  Further, in FIG. 6C, in the first state, referring to the previous determination result 502, is it continuously non-dehydrated from the previous time, or was the previous dehydrated state, but was this time non-dehydrated state? Can be identified. That is, in the first state, when the measurement information determination result 502 indicates a non-dehydrated state, the display background color is set to blue, and when the measurement information determination result 502 indicates a dehydrated state, the display background color is set to yellow. Is done.

  Further, when the measured value of the moisture content this time is extremely small, it may be assumed that an urgent countermeasure is required, and red blinking may be performed regardless of the content of the previous measurement information. Further, in addition to the change of the display form, the buzzer 222 corresponding to each of the first to third states may be sounded or the LED lamp 223 may be turned on.

  In addition, the measurement information held in the memory 203 is assumed to hold the determination result 502, but is not limited thereto. For example, if the determination result 502 is generated by determining whether or not the dehydration state is obtained from the measurement value 501 of the measurement information read from the memory 203, the determination result 502 is unnecessary in the measurement information held in the memory 203. Become.

  In the above embodiment, the background color of the display unit is set as the display form, but the present invention is not limited to this. For example, as a display form to be set, the color of a portion (7-segment display portion) for displaying numbers may be changed instead of the background color. Alternatively, a predetermined mark and animation may be displayed.

  Moreover, in the said embodiment, in order to determine the validity of the last measurement information, the last measurement time was memorize | stored and compared with the present time, However, It is not restricted to this. For example, a timer may be started at the timing when the measurement value is acquired, and if the timer has expired, it may be determined that the previous measurement information is invalid.

  As described above, according to the moisture meter in the body of the above embodiment, the state of the moisture content in the body of the subject can be easily grasped.

  The present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, in order to make the scope of the present invention public, the following claims are attached.

This application claims priority based on Japanese Patent Application No. 2011-144519 filed on June 29, 2011, the entire contents of which are incorporated herein by reference.

Claims (7)

Measuring means for measuring the moisture content of the subject;
Display means for displaying the current amount of water measured by the measuring means;
A determination means for determining whether the subject is in a dehydrated state or a non-dehydrated state based on the amount of water at this time
Holding means for holding the current water amount and the determination result of the determining means for the current water amount as measurement information;
Based on the previous moisture amount obtained from the previous measurement information held in the holding means and the previous determination result as to whether or not the dehydration state is present, and the current moisture amount and the current determination result by the determination means. And a change means for changing a display form of the display means. The changing means is
A first state in which the current determination result is a non-dehydrated state;
Whether the previous determination that said current judgment result is a dehydrated state is non-dehydrated, the current determination result and the previous determination result is the time from the water content of the pre-Symbol last a dehydrated The second state with more water
A third state in which the current determination result and the previous determination result are in a dehydrated state, and the current water content is less than or equal to the previous water content;
The in-vivo moisture meter according to claim 1, wherein the display form is made different depending on which state is selected. The in-vivo moisture meter according to claim 2, wherein the changing unit further changes the display form in the first state based on a difference between the previous water amount and the current water amount. The display means, the display time of the water content and the previous amount of water at the same time, or and displaying is switched alternately in accordance with the operation input, to any one of claims 1 to 3 Body moisture meter as described. A judgment means for judging the validity of the measurement information held in the holding means based on an elapsed time since the measurement information was held;
The changing means determines the display mode by the display means using the current moisture amount or the current determination result when the determination means determines that the previous measurement information is invalid. The in-vivo moisture meter according to any one of claims 1 to 4 , wherein the in-vivo moisture meter is characterized. The determination means determines the effectiveness by comparing the elapsed time with a threshold value, and the threshold value is changed based on at least one of the previous moisture amount or the previous determination result. The in-vivo moisture meter according to claim 5 . A method for operating the moisture meter in the body,
A measuring step in which the measuring means measures the moisture content of the subject;
A display step in which the display means displays the amount of moisture of this time measured in the measurement step on the display means;
A determination step for determining whether the subject is in a dehydrated state or a non-dehydrated state based on the water content of the current time;
A holding step of holding in the memory as measurement information the current moisture content and the determination result of the determination step for the current moisture content;
The change means is the previous determination of whether or not the previous moisture amount and dehydrated state obtained from the previous measurement information held in the memory, the current moisture amount and the determination result of the determination step based on the method for operating a body water meter and having an a changing step of changing the display form of the display means by said display step.

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