JP2012200490A - Muscle fatigue reducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a muscle fatigue reducing device capable of highly accurately determining muscle fatigue and efficiently reducing the muscle fatigue.SOLUTION: The biological impedance of two different parts of an object person 20 is measured in the body fluid amount volume ratio calculation part 15 of a control part 10, and a muscle fatigue degree is determined on the basis of the change of the ratio of the biological impedance in a muscle fatigue determination part 17. Then, by a muscle stimulation part 19, the muscle of a part different from the muscle of the part turned to the measurement object of the biological impedance, which is more at a distal position in the view from the heart than a part where a body fluid volume is insufficient, is stimulated, and the muscle fatigue is efficiently reduced.

Description

  The present invention relates to a muscular fatigue reduction device, and more particularly to a muscular fatigue reduction device that determines a fatigue state of a muscle and recovers the fatigue.

  When athletes who use muscles on a daily basis recover or improve their muscular strength, it is necessary to accurately know the state of muscle fatigue. For example, in Patent Document 1, in order to objectively evaluate muscle fatigue, bioimpedance and electromyogram of a target muscle are measured, and the degree of muscle fatigue is determined from the change rate of the bioimpedance and electromyogram. The technology to do is proposed. Further, Patent Document 2 detects a swelling-prone part, for example, a swelling state of a calf, and controls the strength and time of massage by adjusting the inflation pressure of the airbag targeting the part. We are proposing an air-type massage machine aimed at improving the swelling.

JP 2004-49789 A JP 2006-175016 A

  In the muscle fatigue measuring apparatus described in Patent Document 1 described above, focusing on the fact that body fluid tissues such as muscle blood and lymph fluid change when muscle fatigue occurs, the change is measured as bioimpedance. Here, since bioimpedance has large individual differences, it is difficult to evaluate the absolute value of the change. Therefore, the myoelectric potential (electrical signal generated when the muscle is moved) is measured simultaneously, and the rate of change of bioimpedance and myoelectric potential. Is used to determine the degree of muscle fatigue. However, in a state where the muscle is not used so much, for example, when sitting for a long time, only a slight change in myoelectric potential is observed. Therefore, in patent document 1, there existed a problem that the determination precision of the muscular fatigue at the time of sitting down holding the same attitude | position was low.

  Further, in the muscle stimulation method using a massage machine described in Patent Document 2, muscle fatigue is reduced by directly stimulating a region where muscle fatigue is likely to occur while combining the strength and time of the inflation pressure of the airbag. ing. However, in the method described in Patent Document 2, the muscles in which fatigue has occurred are directly stimulated, so that even if a temporary reduction in the feeling of muscle fatigue can be realized, the muscles are easily damaged, which becomes inflammation. In addition, there was a problem of falling into a vicious circle (so-called stagnation phenomenon) in which the muscles had to be stimulated more strongly.

  The present invention has been proposed to solve the above-described problems, and an object of the present invention is to provide a muscle fatigue reduction device that can efficiently reduce muscle fatigue caused by sitting for a long time.

  In order to achieve the above object, a muscle fatigue reduction device according to the first aspect of the present invention includes a physical quantity measuring unit that measures a physical quantity according to a body fluid amount of a predetermined measurement site of a subject, and the physical quantity measuring unit. Based on the measured physical quantity, a muscle fatigue degree calculating means for calculating a muscle fatigue degree of a predetermined muscle fatigue determination target portion, and a muscle fatigue degree calculated by the muscle fatigue degree calculating means is a predetermined threshold value The muscle fatigue determination means for determining that the muscle fatigue determination target part is in a muscle fatigue state, and the muscle fatigue determination means determines that the muscle fatigue determination target part is in a muscle fatigue state. In addition, it is possible to promote the movement of body fluid from a portion that is distal to the subject's heart and that is different from the muscle fatigue determination target portion to a portion where the amount of fluid is insufficient from a portion where the amount of fluid is excessive Stab that stimulates muscles in the area And means, the.

  By adopting such a configuration, it is possible to know the bias of the whole body's fluid retention of the subject, accurately determine the muscle fatigue level of the muscle fatigue determination target region, and the region where the muscle fatigue occurs and the stimulation It is possible to clearly discriminate the site from which the body is given and to effectively eliminate the imbalance of the body fluid, and to prevent inflammation at the site where muscle fatigue occurs.

  According to a second aspect of the present invention, in the first aspect of the invention, the measurement site is a first measurement site that is a target site for muscle fatigue determination of the subject, and is more distal than the first measurement site. It is characterized by being at least two parts including the second measurement part. The first measurement site is any one of the waist, back, and buttocks of the subject, and the second measurement site is the calf of the subject. The invention according to claim 4 is the invention according to claim 1, wherein the measurement site is a site other than the muscle fatigue determination target site of the subject, and is at least distal to the subject's heart. There are two sites. Thus, by making at least two sites as measurement sites, individual differences in muscle fatigue level determination can be eliminated.

  The invention according to claim 5 is the muscle fatigue reduction device according to any one of claims 2 to 4, wherein the physical quantity measuring means has a bioimpedance indicating the amount of body fluid in each of the at least two sites as the physical quantity. Measured, and the muscle fatigue level calculating means calculates the muscle fatigue level based on a ratio of bioimpedance measured by the physical quantity measuring means. Thereby, based on the physical quantity according to the body fluid quantity in a different measurement site | part, the bias | inclination of the whole body fluid storage of a subject can be known.

  The invention according to claim 6 is the muscle fatigue reduction device according to claim 1, wherein the physical quantity measuring means measures a perimeter of a calf portion that varies according to the amount of body fluid as the physical quantity, and the degree of muscle fatigue The calculating means calculates the muscle fatigue level based on the rate of change of the perimeter of the calf portion measured by the physical quantity measuring means. Thereby, the muscle fatigue degree of the muscle fatigue determination target part can be accurately determined using the relative ratio of the change rate of the perimeter of the calf as a muscle fatigue index.

  The invention according to claim 7 is the muscle fatigue reduction device according to any one of claims 1 to 6, wherein the physical quantity measurement means performs the measurement on a subject in a sitting state, and the stimulation means includes Stimulating the muscles of the thigh of the subject in the sitting state. Accordingly, it is possible to accurately determine muscle fatigue of a person who is in a sitting state while maintaining the same posture for a long time, and to effectively recover the amount of body fluid at a site where muscle fatigue occurs.

  The muscle fatigue reduction device according to the present invention measures the amount of body fluid in at least two measurement parts of a subject and knows the bias of the whole body fluid retention of the subject, thereby accurately determining the degree of muscle fatigue. And it has the outstanding effect that the muscle fatigue can be reduced efficiently.

It is a block diagram which shows the whole structure of the muscular fatigue reduction apparatus which concerns on embodiment of this invention. It is a figure showing typically the muscle fatigue reduction device concerning an embodiment. It is a flowchart which shows the control procedure which determines and reduces muscle fatigue in the muscle fatigue reduction apparatus which concerns on embodiment. It is a graph which shows the relationship between the judgment threshold value of muscle fatigue and muscle stimulation in the muscle fatigue reduction device according to the embodiment. It is a flowchart which shows the control procedure of determination and reduction of the degree of muscle fatigue in the muscle fatigue reduction apparatus which concerns on a modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing an overall configuration of a muscle fatigue reduction device according to an embodiment of the present invention. FIG. 2 is a diagram schematically showing an embodiment in which the muscle fatigue reduction device is applied to reduce muscle fatigue of a vehicle driver. In the muscle fatigue reduction device 1 shown in FIG. 1, the control unit 10 is a body fluid of a first part of a person to be measured for muscle fatigue who is a subject for muscle fatigue reduction (hereinafter simply referred to as a subject 20). In order to measure the volume, the first body fluid volume measuring unit 11 to which the electrodes 31a and 31b are connected and the second body fluid to which the electrodes 33a and 33b are connected to measure the volume of body fluid in the second part of the subject 20 The body fluid volume measuring section 12, the body fluid volume ratio calculating section 15 to which the measurement results from the first body fluid volume measuring section 11 and the second body fluid volume measuring section 12 are input, and the muscle fatigue level in the fatigue determination target part The muscle fatigue determining unit 17 for determining and the muscle stimulating unit 19 for receiving the determination result of the muscle fatigue level by the muscle fatigue determining unit 17 and stimulating specific muscles of the subject 20 are provided. The muscle stimulating unit 19 controls the compressor 38, adjusts the internal pressure of the airbag 35 connected to the compressor 38, and vibrates it to give the subject 20 muscle stimulation.

  Although not shown in the figure, the control unit 10 is responsible for controlling the muscle fatigue reduction device 1 as a whole, for example, a microprocessor, a basic program such as an operating system (OS), a program showing a control procedure for muscle fatigue reduction, and the like. It includes a read-only memory (ROM) that is a stored storage medium, and a read / write memory (RAM) that is a storage medium that temporarily stores various data used for muscle fatigue reduction control and the like.

  The muscle fatigue reduction device 1 according to the present embodiment measures the muscle fatigue level of a subject who is often seated while holding the same posture for a long time, such as a subject engaged in office work or a driver of a vehicle. At the same time, it is a device that reduces the muscle fatigue. Such muscle fatigue due to sitting for a long time is considered to be caused by the fact that body fluids (for example, blood, lymph, etc.) in the muscles do not circulate properly. That is, in the muscle fatigue reduction device 1 according to the present embodiment, in a static sitting state, body fluid movement occurs in the upper body due to the influence of gravity, and the body fluid is insufficient in the upper body and excess body fluid in the lower body. The amount of body fluid of the subject 20 for reducing muscle fatigue is measured at at least two different sites. Specifically, the lumbar part (first part) and the calf part (second part) where muscle fatigue is likely to occur due to sitting for a long time are set as measurement target parts for muscle fatigue. Then, the body fluid amount in the first part of the subject 20 is measured by the first body fluid amount measuring unit 11, and the body fluid amount in the second part of the subject 20 is measured by the second body fluid measuring unit 12.

  Moreover, in the muscular fatigue reduction apparatus 1, the electrical impedance (it is also called bioimpedance) in each site | part is measured as a biological quantity which shows the body fluid quantity of a waist | lumbar part and a calf part. Here, the electrical impedance of the lower back (first part) is measured by the first body fluid amount measuring unit 11, and the electrical impedance of the calf part (second part) is measured by the second body fluid measuring unit 12. . The body fluid amount ratio calculation unit 15 calculates the ratio of the obtained electrical impedance of the waist and the electrical impedance of the calf. The body impedance includes blood, lymph fluid, interstitial fluid, intracellular fluid, and the like, and the amount of these body fluids in the living tissue is to measure the electrical impedance of the target site and calculate the ratio thereof. Then, the fact that the resistance value (impedance) decreases is used.

  As described above, in a static sitting state for a long time, gravity greatly affects the body fluid circulation. In the lumbar region, in particular, lymph fluid and interstitial fluid flow out and impedance increases, whereas in the calf region, body fluid flows in and impedance decreases. Therefore, fluid circulation insufficiency (fluid imbalance) that causes muscle fatigue is observed as an opposite physiological phenomenon depending on the region, and the ratio of the electrical impedance with respect to the amount of fluid in the two different regions described above (this will be referred to hereinafter). , Also referred to as a muscle fatigue index), increases due to changes in fluid volume accompanying fluid fluid failure. Therefore, the muscle fatigue determination unit 17 of the muscle fatigue reduction device 1 compares the muscle fatigue index input from the body fluid volume ratio calculation unit 15 with a predetermined threshold, and based on the balance state of body fluid (for example, a fatigue determination target part (for example, , Lower back) muscle fatigue.

  The muscle stimulating unit 19 of the muscle fatigue reducing device 1 gives a stimulus to a predetermined part (here, the biceps femoris) of the subject 20 based on the result of the muscle fatigue determination in the muscle fatigue determination unit 17. When the muscle fatigue determination unit 17 determines that the muscle fatigue index is greater than a predetermined threshold (muscle fatigue determination threshold), as shown in FIG. 2, the biceps femoris of the thigh 25 of the subject 20 The air bag 35 is vibrated by adjusting the internal pressure of the air bag 35 disposed between the vehicle and the vehicle seat cushion 34 by the compressor 38. Then, stimulation is given to move the biceps femoris by the vibration of the airbag 35. The site to which stimulation is applied is a muscle that is different from the muscle that measures electrical impedance, and that is located farther from the heart than the muscle that lacks fluid volume.

  As shown in FIG. 2, in the muscle fatigue reduction device 1 according to this embodiment, electrodes 31 a and 31 b are pasted on the skin of the waist 21 of the subject 20, and electrodes 33 a and 33 b are pasted on the skin of the calf 23. More specifically, a pair of electrodes 31a and 31b are attached to the lumbar gluteal muscles at a certain distance in the lumbar region 21, and a pair of electrodes 33a and 33a at a certain distance from the calf portion 23 in the calf part 23. 33b is pasted. Then, a weak alternating current is applied to the waist 21 through the electrodes 31a and 31b from the constant voltage source 41 provided in the first body fluid volume measuring unit 11, and the second body fluid volume measuring unit 12 is passed through. A weak alternating current is passed from the provided constant voltage source 43 to the calf portion 23 via the electrodes 33a and 33b. Here, a weak alternating current of about 0.5 mA is applied to the waist 21 and the calf 23 from the constant voltage sources 41 and 43 while applying a constant voltage with a frequency of 50 kHz, for example. And simultaneously with flowing such an alternating current, with the 1st measuring device 51 provided in the 1st bodily fluid measurement part 11, the bioimpedance of the waist | lumbar part 21 is measured and the 2nd bodily fluid measurement part 12 inside The bioelectrical impedance of the calf portion 23 is measured by the second measuring instrument 53 provided in the above.

  Next, a control method for determining and reducing the muscle fatigue state of the subject in the muscle fatigue reduction device according to the present embodiment will be described. FIG. 3 is a flowchart showing a control procedure of a program for determining and reducing muscle fatigue in the muscle fatigue reducing apparatus according to the present embodiment. FIG. 4 is a graph showing the relationship between the muscle fatigue determination threshold of the subject and muscle stimulation in the muscle fatigue reduction device 1 according to the present embodiment. In step S11 of FIG. 3, the bioimpedance of the waist (first part) of the subject is measured by the first body fluid amount measuring unit 11 of the control unit 10, and the calf part is measured by the second body fluid measuring unit 12. The bioimpedance of (second part) is measured. The bioimpedance obtained here is the electrical impedance as the amount of living body according to the amount of body fluid of the living tissue in each of the waist and calf.

In step S13, the body fluid volume ratio calculator 15 of the controller 10, and the bioimpedance of the body fluid volume in the lumbar measured in step S11 in the above (and R _1), bioimpedance of the body fluid volume in the calf portion ( calculating the ratio _R 1 / _{R 2} and the R _2). In subsequent step S15, the muscle fatigue determination unit 17 of the control unit 10 receives the impedance ratio R ₁ / R ₂ input from the body fluid volume ratio calculation unit 15 (hereinafter, this impedance ratio is referred to as a muscle fatigue index _FR1-R2 ). _Is compared with a predetermined determination threshold value (F _{th in} FIG. 4) to determine the degree of muscle fatigue of the fatigue determination target part (for example, the waist). In step S15, when the muscle fatigue index is larger than the determination threshold value (when _FR1-R2 > _Fth is satisfied), it is determined that muscle fatigue has occurred.

If it is determined in step S15 that muscle fatigue has occurred, the muscle stimulating unit 19 of the control unit 10 in step S17, as described above with reference to FIG. By stimulating an airbag 35 disposed between the muscle and the vehicle seat cushion 34, stimulation of the biceps femoris is started. The start of stimulation to the biceps femoris corresponds to the time point a in the passage of the sitting time shown in FIG. Then, the control part 10 returns a process to step S11 again, and measures the bioimpedance of each site | part (waist part and calf part) similarly to the above. In step S13, the bioimpedance ratio R ₁ / R ₂ of those parts is calculated, and then in step S15, the muscle fatigue index F _R1-R2 is compared with the determination threshold F _th to determine the fatigue determination target part. Determine muscle fatigue. If it is determined in step S15 that the fatigue determination target region of the subject 20 is in a muscle fatigue state, stimulation to the biceps femoris is continued in step S17. In this way, the part to which stimulation is applied is the biceps femoris muscle, which is a part of a part different from the part of the part where the electrical impedance is measured (that is, the part of the fatigue measurement target part), and the amount of fluid is insufficient. This is because it is located farther from the heart than the muscle of the part (here, the lumbar gluteal muscle) and relatively thick.

  If it is determined in step S15 that the fatigue determination target portion of the subject 20 is not in a muscle fatigue state, the muscle fatigue determination unit 17 of the control unit 10 determines whether or not there is a current muscle stimulation in step S21. . If there is muscle stimulation (YES in step S21), the control unit 10 ends the muscle stimulation by the muscle stimulation unit 19 in step S23. The end of the muscle stimulation corresponds to the point b in the passage of the sitting time shown in FIG. And the control part 10 returns a process to step S11, and enters the determination process of the presence or absence of a muscular fatigue state again. On the other hand, when it determines with there being no muscle stimulation in step S21, the control part 10 returns a process to step S11, and transfers to the process which determines the presence or absence of muscle fatigue.

Thus, the muscular fatigue reduction device 1 according to the present embodiment is from when it is determined that the subject 20 is in a muscular fatigue state until it is determined that the muscular fatigue has been reduced, that is, Stimulation to the biceps femoris is continued during the period from a to b indicated by arrows in FIG. 4 where the muscle fatigue index (F _{R1 -R2} )> the determination threshold (F _th ). Note that, as described above, muscle stimulation may be applied continuously while F _R1-R2 > F _th is established, or muscle stimulation may be applied intermittently during that time.

  In the muscle fatigue reduction device 1 according to the present embodiment, a muscle pump action is expressed by muscle stimulation of the subject 20 by the muscle stimulating unit 19, whereby a side closer to the heart as a reference from a portion far from the heart as a reference. The body fluid is effectively returned to the site. As a result, the amount of bodily fluid in the calf 23 decreases and the amount of bodily fluid in the waist 21 increases. The muscle pumping action is the action of returning blood sent from the heart and the accompanying lymph fluid to the heart side by the muscle activity. Here, for example, the muscle pump action is activated by activating the thigh by external stimulation to the lower back 21 that is aware of pain and numbness due to lack of bodily fluid, and the amount of bodily fluid in the lower back 21 is restored, and the calf By eliminating the swelling of the portion 23, muscle fatigue is efficiently reduced.

  As described above, in the muscle fatigue reduction device according to the present embodiment, at least two parts of the living body, for example, the waist and calf parts, the change in the ratio of the bioimpedance indicating the amount of body fluid in those parts Determine muscle fatigue based on the above. By doing this, it is possible to eliminate individual differences in the measurement results of muscle fatigue, and to know the bias of systemic fluid retention, so that the muscle strength can be evaluated rather than the conventional local bioimpedance alone. Fatigue detection accuracy can be improved.

  In addition, when muscle fatigue has occurred, stimulation is performed on muscles that are different from the muscles that are the target of measurement of bioimpedance and that are located farther from the heart than the part where the amount of fluid is insufficient. give. By adopting such a configuration, it is possible to effectively utilize a physiological function called a muscle pump action, and it is possible to move a body fluid from a body tissue with an excessive amount of body fluid to a body tissue with an insufficient amount of body fluid. In other words, because the muscles of the waist and calf, which are easily fatigued, are not directly stimulated, not only avoids inflammation of the waist and calf, but also stimulates thick muscles like the biceps femoris with strong muscle pumping action. Thus, the body fluid can be efficiently returned to the heart side. As a result, the body fluid tissue at the target site returns to normal, and muscle fatigue can be recovered.

<Modification>
In the above-described embodiment, the bioimpedance for the amount of body fluid in the lower back and the calf of the subject 20 is measured as the muscle fatigue measurement target site, but the muscle fatigue measurement target site is not limited to this. . For example, instead of the waist, a part below the heart, such as the back and buttocks, may be used as the determination target part. Moreover, it is good also considering the muscle fatigue degree measurement object part at least two places far from the determination object part (for example, waist | hip | lumbar part) of a muscle fatigue degree.

  Moreover, in the said embodiment, although the alternating voltage signal of frequency 50kHz was used for the measurement of bioimpedance, the frequency of a signal is not limited to this, For example, it is good also as an alternating current signal of 1000 kHz. In measurement using a 50 kHz signal, impedance related to extracellular fluid such as lymph fluid and interstitial fluid can be measured, but in addition to impedance related to extracellular fluid, impedance of intracellular fluid can be measured using an alternating current signal of 1000 kHz. . Furthermore, a ratio between a measurement value obtained by a 50 kHz signal and a measurement value obtained by a 1000 kHz signal may be calculated and used as a muscle fatigue index. In this case, the amount of the extracellular fluid with respect to the whole of the intracellular fluid and the extracellular fluid can be acquired by the muscle fatigue index.

  Moreover, in the said embodiment, although the electrode is stuck on the skin of a measurement object site | part (a waist | lumbar part and a calf part), and the bioimpedance of the site | part is measured, the measuring method is not limited to this. For example, the bioelectrical impedance may be measured in a non-contact manner by making an electromagnetic coil close to the muscle tissue of the measurement target site and using an eddy current generated in the muscle tissue by a magnetic field. This utilizes the fact that when an electromagnetic coil is brought close to muscle tissue, eddy current generated in the muscle is affected by the impedance of the muscle. In this case, the impedance of the muscle is measured by arranging the electromagnetic coil with the coil axis direction aligned with the muscle, and measuring the output voltage associated with the inductance change of the electromagnetic coil.

  Furthermore, in the above-described embodiment, the amount of body fluid at the measurement site is obtained from the electrical impedance, but the measurement of the amount of body fluid is not limited to this. For example, in the calf part, the amount of body fluid tends to be excessive when seated, and the perimeter increases as the amount of body fluid increases, so the muscle fatigue level should be calculated based on the rate of change of the perimeter of the calf part. It may be. FIG. 5 is a flowchart showing the determination of the degree of muscle fatigue based on the rate of change in the perimeter of the calf and the control procedure for reducing the muscle fatigue. In step S51 of FIG. 5, the subject's calf part is wound with, for example, a line with a strain gauge, and the perimeter of the calf part is measured. In the subsequent step S53, the rate of change of the perimeter of the calf is obtained. Here, the change in the perimeter of the calf is taken as the voltage change of the strain gauge. And then. In step S55, the rate of change of the perimeter obtained in step S53 is compared with a predetermined reference value. If the rate of change of the perimeter is greater than the reference value, it is determined that muscle fatigue has occurred. However, if the rate of change in perimeter is equal to or less than the reference value, it is determined that muscle fatigue has not occurred. In addition, since the process of step S57, S61, S63 is the same as step S17, S21, S23 of FIG. 3, those description is abbreviate | omitted here.

  In the above-described embodiment, the airbag placed between the subject's biceps femoris and the vehicle seat cushion is vibrated to give muscle stimulation to the biceps femoris. It is not limited to this. For example, an electrode may be attached to the skin of the biceps femoris, a low-frequency voltage may be applied to the electrode, and a weak current may be applied to activate the muscle by electrical stimulation.

Furthermore, in the above embodiment, when determining the degree of muscle fatigue of a specific part of the subject, the ratio R ₁ / R ₂ of the bioimpedances R ₁ and R ₂ of the waist part and calf part as the measurement target part is determined as muscle fatigue. As an index, the muscle fatigue index is compared with a threshold value, but is not limited thereto. For example, when the bioimpedance ratio R ₂ / R ₁ is calculated as a muscle fatigue index F _R1-R2 and this muscle fatigue index is smaller than a predetermined determination threshold F _th (when F _R1-R2 <F _th is satisfied) ), It may be determined that muscle fatigue has occurred in a specific part of the subject.

DESCRIPTION OF SYMBOLS 1 Muscle fatigue reduction apparatus 10 Control part 11 1st body fluid volume measurement part 12 2nd body fluid volume measurement part 15 Body fluid volume ratio calculation part 17 Muscle fatigue determination part 19 Muscle stimulation part 20 Target person 21 Waist part 23 Calf part 25 Thigh Parts 31a, 31b, 33a, 33b Electrode 34 Seat cushion 35 Air bag 38 Compressor 41, 43 Constant voltage source 51 First measuring instrument 53 Second measuring instrument

Claims (7)

A physical quantity measuring means for measuring a physical quantity according to the amount of body fluid of a predetermined measurement site of the subject;
Based on the physical quantity measured by the physical quantity measuring means, muscle fatigue degree calculating means for calculating a muscle fatigue degree of a predetermined muscle fatigue determination target part;
Muscle fatigue determination means for determining that the muscle fatigue determination target portion is in a muscle fatigue state when the muscle fatigue level calculated by the muscle fatigue level calculation means is higher than a predetermined threshold value;
When the muscle fatigue determination means determines that the muscle fatigue determination target part is in a muscle fatigue state, it is a part that is distal to the subject's heart and is different from the muscle fatigue determination target part. And a stimulating means for stimulating muscles of a part capable of urging body fluid movement from a part having excessive body fluid amount to a part having insufficient body fluid amount;
An apparatus for reducing muscle fatigue. The measurement site is at least two sites including a first measurement site that is a target site for muscle fatigue determination of a subject and a second measurement site that is distal to the first measurement site. Item 12. The muscle fatigue reduction device according to Item 1. The muscle fatigue reduction device according to claim 2, wherein the first measurement site is any one of a waist, back, and buttocks of the subject, and the second measurement site is a calf of the subject. The muscle fatigue reduction device according to claim 1, wherein the measurement site is a site other than a muscle fatigue determination target site of the subject and at least two sites distal to the subject's heart. The physical quantity measuring means measures bioimpedance indicating the amount of body fluid in each of the at least two sites as the physical quantity, and the muscle fatigue level calculating means is based on the ratio of bioimpedance measured by the physical quantity measuring means. The muscle fatigue reduction device according to any one of claims 2 to 4, wherein the muscle fatigue degree is calculated. The physical quantity measuring means measures the perimeter of the calf part that varies according to the amount of body fluid as the physical quantity, and the muscle fatigue level calculating means is the rate of change of the perimeter of the calf part measured by the physical quantity measuring means. The muscular fatigue reduction device according to claim 1, wherein the muscular fatigue degree is calculated on the basis of the level. The physical quantity measuring unit performs the measurement on a subject in a sitting state, and the stimulation unit stimulates muscles of the thigh of the subject in a sitting state. Muscle fatigue reduction device.

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