JP2019051059A - Wearable posture control training machine and posture control training method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wearable posture control practice machine and a posture control practice method capable of more effectively performing posture control practice by feeding back information on the position of the wearer's knee to the wearer. SOLUTION: This is a wearable posture control training machine, and has a wearable posture having a light irradiation portion indicating the position of the wearer's knee and a support portion for supporting the light irradiation portion on the wearer's body. It is a control training machine. Posture control practice method in which the wearer adjusts the position of the knee while visually checking the position of the light spot by irradiating the light indicating the position of the wearer's knee from the irradiation part attached to the wearer's body. Is. [Selection diagram] Fig. 3

Description

The present invention relates to a wearable posture control practice machine and a posture control practice method.

In Japan, which has become a super-aged society, there is a desire to continue living in a community where people are accustomed to living even when nursing care is necessary. In response to these requests, various measures are being considered for the construction of a comprehensive care system in the region with the goal of providing housing, medical care, nursing care, disease prevention, and life support in an integrated manner. .

Although it is important to build a comprehensive care system, it is important that care is not required in the first place. If the need for long-term care becomes longer, the long-term care insurance system in Japan will become difficult due to the economic burden. By the way, according to the National Life Infrastructure Survey of the Ministry of Health, Labor and Welfare (2010), the fourth most common cause of bedridden status among those requiring care of people over 65 was a fracture caused by a fall. In terms of percentage, it accounts for 9.3% of the total. Therefore, preventing falls is an effective measure for preventing bedridden people.

Next, the prior art will be described. As an apparatus for diagnosing an equilibrium failure that causes a fall, an apparatus as disclosed in Patent Document 1 is known. Further, an apparatus as disclosed in Patent Document 2 is known as an apparatus for inspecting the function of the equilibrium cooperative system.

JP 2008-73267 A Japanese National Patent Publication No. 11-502429

The device of Patent Document 1 is used by being attached to the waist of a subject who is stationary and standing. This device includes an accelerometer, and measures the acceleration in the front-rear direction and the left-right direction with the accelerometer. It is assumed that the predetermined parameter obtained from the acceleration in two directions can be adopted as a measured value or an evaluation value of wobbling.

The apparatus of Patent Document 1 is merely an apparatus that merely evaluates the wobbling. Therefore, it is not possible to practice posture control.

The device of Patent Document 2 is used by being attached to the head. This device includes an alcohol level, a mounting tool for the device to the head, and a connector for connecting the alcohol level and the mounting tool. When the head fluctuates, the alcohol level is shaken through the fixture and the connecting tool, and the fluctuation is visualized. With this device, even if the body is not staggered, if the head shakes, the shake is reflected in the alcohol level sensitively. Therefore, the body shake may not be measured accurately.

The present invention provides a wearable posture control practice machine and posture control practice method that can more effectively practice posture control by feeding back information on the position of the knee of the wearer to the wearer. With the goal.

A wearable posture control training machine comprising a light irradiation unit indicating a position of a wearer's knee, and a support unit that supports the light irradiation unit on the wearer's body ( The above problem is solved by simply calling it a training machine. Also, the posture control that adjusts the position of the knee while irradiating light indicating the position of the wearer's knee from the irradiation unit attached to the wearer's body and visually confirming the position of the light spot Solve the above problem by practice method.

The wearer receives the feedback of information regarding the position of his / her knee by the light irradiated from the irradiation unit, and can practice so as to keep the position of the knee constant. The wearer can improve his / her posture control ability by repeating the practice.

In the training machine, the irradiation unit preferably irradiates light indicating the position of the knee at a position visible to the wearer. Thereby, a wearer can visually recognize and confirm the light irradiated by the irradiation part directly. In this way, it is not necessary to display the position of the knee on a display device such as a display. The configuration of the apparatus is also simplified, and information processing using an arithmetic unit or the like regarding the position of the knee can be omitted.

In the above training machine, the light is preferably highly directional light. Since highly directional light is not easily diffused and travels straight, it is possible to improve visibility when confirming the position of the knee and feed back the position of the knee more accurately to the wearer.

It is preferable that the training machine further includes a reflection unit that reflects light emitted from the irradiation unit. By using the reflection part, it is possible to optimize the position where the irradiation part is provided. For example, by adopting a configuration in which light is refracted using a reflecting portion, it is possible to downsize the apparatus, or to arrange the irradiation portion at a desired position such as a position that does not hinder the operation when practicing.

In the above training machine, the reflecting part is preferably arranged at the position of the wearer's knee. According to this structure, it becomes possible to irradiate the light which shows the position of a knee part to arbitrary directions by irradiating light to the reflection part distribute | arranged to the knee part.

In the above training machine, the support part is preferably a band-shaped member made of an elastic material. By doing in this way, it becomes possible to wrap and fix the training machine around any part of the wearer's body. For example, the support portion can be fixed to the wearer's leg.

It is preferable that the training machine further includes a target for irradiating light indicating the position of the knee. By providing a target, a target for irradiating light is given. By setting a target, it becomes possible to prevent the practice from becoming monotonous. By repeating the practice of irradiating light toward the target, it becomes possible to efficiently improve its posture control ability.

According to the present invention, it is possible to provide a wearable posture control training machine capable of performing posture control practice more effectively by feeding back information on the position of the knee of the wearer to the wearer. Become.

It is a perspective view showing one embodiment of a posture control training machine. It is a perspective view which shows the state which wore the attitude | position control training machine of FIG. It is a figure which shows the state which is using the attitude | position control training machine. It is the graph which evaluated the effect of the practice which concerns on Test Example 1 to Test Example 3 with the rectangular area. It is the graph which evaluated the effect of the practice which concerns on the test example 1 to the test example 3 with the total locus | trajectory length. It is the graph which evaluated the effect of the practice which concerns on the test example 1 to the test example 3 by the knee joint shaking.

Hereinafter, an embodiment of a posture control training machine will be described with reference to the drawings. Embodiment shown below is only an example and this invention is not limited to this.

As a result of repeated research by the inventor, the ability to control posture is intended to stabilize the body based on sensory input from the visual system, vestibular maze system, and / or somatosensory system. It has been found that the cooperative action of the lower limb joint is necessary, and in particular, the cooperative action of the vision and the lower limb joint is important. The position of the knee joint changes due to the influence from the upper part such as the trunk and the hip joint and the influence from the lower part such as the foot and the ankle joint. That is, the knee joint is an important part that reflects the movement of each part of the higher body and the movement of each part of the lower body.

The posture control training machine of the present embodiment irradiates an arbitrary object with light indicating the position of the knee, and visually feeds back the position information of the light to the wearer, so that the vision and lower limb joints The practice of strengthening the cooperative work with can be performed efficiently.

As shown in FIG. 1, the posture control training device 1 according to this embodiment includes a light irradiation unit 11 indicating the position of the knee 51 of the wearer 5 and the light irradiation unit 11 on the wearer 5 body. And a support portion 12 to support. As shown in FIG. 2, the posture control training machine 1 is worn on the body and used. The light indicating the position of the wearer's knee may be emitted directly from the irradiating unit to any object, or may be any object using reflection of light emitted from the irradiating part. The object may be irradiated.

The light irradiation part should just be what can irradiate the light which shows the position of the wearer's 5 knee part 51. FIG. As the light irradiation part, it is preferable to use a light source capable of emitting light having a high directivity that is difficult to diffuse light. Examples of the light having high directivity include laser light and spot light. Spot light can be generated using a light source such as an LED or an incandescent lamp, a lens, and / or a reflector. If light with high directivity is used, it is difficult for light to diffuse. Therefore, it is possible to improve the visibility of a light spot when light indicating the position of the knee is irradiated on an object such as a wall. . In the posture control training machine 1 according to the present embodiment, as shown in FIG. 1, a cylindrical laser light generator is used as the irradiation unit 11. In addition, a light source that is made smaller by using a laser diode or the like may be used as the irradiation unit.

The support part should just be what can support the light irradiation part to the arbitrary parts of a wearer's body. For example, the support portion may be a band-shaped member, a plate-shaped member, or a fixture such as a clip configured to be detachable from the wearer's body. Examples of the body part to which the support part is attached include an arbitrary part such as a wearer's leg, waist, trunk, or shoulder. In the posture control training machine 1 according to the present embodiment, the support portion 12 is a belt-like member made of an elastic material. As the elastic material, for example, a material containing synthetic rubber, vulcanized rubber, or a stretchable fabric such as a knitted fabric may be used.

In the posture control training machine 1 according to the present embodiment, the support unit 12 is made of an elastic material. Therefore, when the body is moved, the position of the support unit 12 is not easily displaced, and the light indicating the position of the knee unit is used. The position is also difficult to shift. For example, when the support portion 12 is fixed above or below the knee joint, the support portion can be prevented from interfering with the movement of the knee joint, and the support portion 12 can be made difficult to shift. Further, when the body is moved, the support part expands and contracts in accordance with the movement of the body, so that discomfort such as pain and pressure is unlikely to occur.

As shown in FIG. 2, the posture control training device 1 of the present embodiment can be fixed by winding the belt-like support portion 12 between the knee joint and the shin of the wearer. And as shown in FIG. 1, the 1st surface fastener 121 is provided in one surface among the surface of the support part 12, and a back surface. And the 2nd surface fastener which can be engaged with a 1st surface fastener is provided in the edge part of the other surface among the surface of the support part 12, and a back surface. For this reason, as shown in FIG. 2, by engaging the first surface fastener 121 and the second surface fastener while the support portion 12 is wound under the knee joint, the support portion 12 is attached to the wearer 5. It can be fixed to the leg. In addition, in FIG. 1, each hook-and-loop fastener part was hatched.

As described above, the support portion 12 is provided with the first surface fastener 121 so as to cover the other end portion from one end portion of the support portion. For this reason, members, such as the power supply 14, the spacer 13, and the irradiation part 11 mentioned later, can be freely fixed with respect to the support part 12 by a corresponding surface fastener. By using a hook-and-loop fastener corresponding to the first hook-and-loop fastener 121, it is possible to directly fix other members, for example, a more miniaturized irradiation section and reflection section to the support section 12.

In the posture control training machine 1 of the present embodiment, a cylindrical light source is used as the light irradiation unit 11. When the cylindrical light source is used, the irradiation unit 12 easily interferes with the knee of the wearer 5 when the wearer practices posture control. Therefore, in the posture control training machine 1 of the present embodiment, the irradiation unit 11 is fixed to the support unit 11 via the spacer 13 so that the irradiation unit 12 is unlikely to interfere with the wearer's knee. Yes.

The spacer 13 is a plate-like member made of an elastic material, and is intended to fix the light irradiation unit at a position away from the body so that the light irradiation unit 11 does not interfere with the wearer's body such as a knee. Arranged at. On the back surface of the spacer 13, a third surface fastener that can be engaged with the first surface fastener 121 provided on the support portion 12 is provided. And as shown in FIG. 1, the surface 13 of the spacer 13 is provided with the 4th surface fastener 131 which can be engaged with the 5th surface fastener 111 provided in the one end part of the irradiation part 11. As shown in FIG. The irradiation part 11 is fixed to the support part 12 by engaging each of the above surface fasteners.

As shown in FIG. 1, the posture control training machine 1 of the present embodiment includes a power source 14. A sixth surface fastener is disposed on the back surface of the power supply 14. The power source 14 is fixed to the support portion 12 by engaging the sixth surface fastener with the first surface fastener 121 of the support portion 12. The power source 14 is wired to the irradiation unit 11 and supplies power to the irradiation unit 11. The power supply is provided with a switch (not shown), which can switch the presence or absence of light irradiation from the irradiation unit.

As shown in FIG. 1, in the posture control training machine 1 of the present embodiment, the irradiation unit 11 is disposed upward, and thus light is irradiated upward. For this reason, in order to change the irradiation direction of light, the reflection part 15 which reflects light is utilized. The reflection part 15 is arranged at the position of the knee part 51 of the wearer 5 and can refract the light emitted from the irradiation part 15 in a direction intersecting the optical axis. For this reason, it is possible to irradiate light with respect to arbitrary objects, such as the wall arrange | positioned at the wearer's front side.

As described above, since the posture control training device 1 of the present embodiment includes the reflecting portion 15, the irradiation portion can be procured at a low cost such as a cylindrical one, but is relatively bulky, has high brightness, and is highly visible. Even if it is excellent, it can be used even if it is relatively bulky. As described above, if the reflecting portion 15 is used, the position where the irradiation portion is arranged can be freely set, and thus the degree of freedom in design can be improved.

As described above, in the posture control training device 1 according to the present embodiment, the light that indicates the position of the knee is emitted to the position where the wearer can visually recognize using the reflecting portion 15. The wearer can visually confirm the position of his / her knee by visually confirming light applied to an arbitrary object such as a wall. The wearer can improve the ability to control the posture by strengthening the cooperative action of the vision and the lower limb joint by repeating the practice so as to keep the position of the light constant.

As shown in FIG. 3, the posture control training machine 1 according to the present embodiment includes a target 17 that can be fixed to an arbitrary object such as a wall. When practicing posture control as described above, if there is no target, the practice will be monotonous. By providing the target 17, it becomes conscious that light is continuously irradiated into the target 17, and it is possible to aim at practice and maintain concentration. Thereby, the efficiency of practice can be improved.

In the posture control practice machine 1 of the present embodiment, as shown in FIG. 1, the reflecting portion 15 is supported in a state in which the reflecting portion 15 is rotatable on an axis provided at the distal end portion of the pair of support rods 161. And placed on the patella portion of the wearer 5. The pair of support rods 161 have base ends fixed to the flanges 16 protruding in a direction intersecting the optical axis of the irradiation unit 15. For example, a reflecting mirror or a prism can be used as the reflecting unit 15. Since the prism has the property of totally reflecting light, it is preferable because the reflectance of light can be made higher than when a reflecting mirror is used. By increasing the reflectance, it becomes possible to further improve the visibility of the light emitted from the irradiation unit.

In the posture control training machine 1 according to the above-described embodiment, the axis serving as the center of rotation of the reflection unit 15 is provided so as to intersect the optical axis of the irradiation unit 11. For this reason, it is possible to finely adjust the direction in which the light indicating the position of the knee is irradiated by rotating the reflecting portion 15 along the direction of the optical axis. For example, even if the target 17 is not fixed so that the height of the target 17 exactly matches the height of the knee 51, the reflecting unit 15 is rotated in the axial direction of the irradiation unit 11 according to the position of the target 17. By doing so, fine adjustment can be made so that light is irradiated in the vicinity of the target 17.

In addition, by setting the collar 16 to be rotatable with respect to the irradiation unit 11, the direction in which the reflection unit 15 reflects light can be rotated in a direction intersecting the optical axis of the irradiation unit 11. Become. This makes it possible to finely adjust the direction in which light is emitted before practice.

In the posture control training machine 1 according to the above-described embodiment, the reflection unit 15 is fixed to the irradiation unit 11 via the support rod 161 and the flange unit 16. For this reason, when the irradiation unit 11 is displaced, the reflection unit 15 is also displaced integrally, and unless the reflection unit 15 is rotated, the incident angle and the reflection angle of light with respect to the reflection unit 15 are always kept constant. Therefore, it is preferable that the position of the light spot irradiated to the target such as a target or a wall does not move due to the irradiation unit 11 being displaced by swinging or the like.

The apparatus configuration of the posture control training machine 1 according to the present embodiment is simple. When the wearer practices the posture control, the wearer adjusts the position of the knee 51 while visually confirming the light emitted from the irradiation unit 11. This eliminates the need for a device or program for detecting or analyzing the position of the light spot. Since the apparatus configuration is simple, it is difficult to break down and can be provided at low cost. The posture control training machine 1 can be easily carried. In addition, if there is an object such as a wall that irradiates light, it is possible to practice regardless of location.

The posture control practice machine of the above embodiment is configured to fix the support portion 12 under the knee joint. You may arrange | position this so that a support part may be fixed on a knee joint and an irradiation part may protrude toward the downward direction. In the posture control practice machine according to the above embodiment, a cylindrical irradiation unit is employed. This may be changed to a smaller irradiation unit such as a button. In that case, what is necessary is just to fix a support part to a wearer's knee joint, and to fix an irradiation part to a support part. If it does in this way, it can use as light which shows the position of a wearer's knee as it is, without changing the direction of the light irradiated from a light source.

In the posture control training machine of the above embodiment, the support portion is fixed under the wearer's knee joint. A support part is good also as a structure which attaches a light irradiation part to a part away from knee parts, such as a waist | hip | lumbar part, a trunk | drum, and a shoulder part of a wearer via a support part. In that case, it is preferable to arrange the reflecting portion on the wearer's knee. And it is preferable to irradiate light from an irradiation part with respect to the reflection part distribute | arranged to the knee part.

Hereinafter, the wearing type posture control practice machine and the posture control practice method using the same will be described in more detail.

In order to confirm the effect of the wearable posture control training machine and the posture control training method using it, the following tests were conducted. The test was conducted on three healthy young students who do not usually have a habit of exercising and have no problems with motor function and balance function. These students were assigned a lottery, and were randomly assigned to three groups of Test Example 1, Test Example 2, and Test Example 3. In Test Example 1 and Test Example 2, the mat 6 made of an elastic material is used as shown in FIG. 3 in order to increase the difficulty of the test in consideration of targeting young healthy persons. Practice was carried out on (There Band Balance Pad).

[Test Example 1]
In Test Example 1, students were asked to wear the wearable posture control training machine shown in FIG. At the time of wearing, as shown in FIG. 2, the reflection part was positioned in front of the patella. Then, as shown in FIG. 3, with the wearable training machine worn, the student stands on one side of the mat 6 and crosses both hands in front of the chest (hereinafter referred to as the practice position). ) Was taken. In this state, as shown in FIG. 3, the reflecting portion was adjusted so that the laser beam was irradiated from the irradiation portion to the vicinity of the target 17 having a diameter of 10 cm fixed to the wall 7. The target 17 was fixed 2 m away from the tip of the mat 6. The height of the target 17 was fixed to the wall 7 so as to be the same as the sum of the length from the knee joint space to the sole of the student and the thickness of the mat 6.

The students were instructed to control their posture so that the laser beam stayed within the target 17 circle, and practiced. In practice, the laser is held in a circle with the above-mentioned practice posture for 1 minute. This one minute practice is one set. Stop the stopwatch when a lifted foot that does not support the load touches the floor, adjust the posture, and resume practice. This was done 3 sets per practice. The exercises were conducted 3 times a week for 2 weeks.

[Test Example 2]
In Test Example 2, the practice was performed under the same conditions as in Test Example 1 except that the posture control training machine was not installed. In order to make the compression force applied from the support part to the lower leg part the same as in Test Example 1, the student was allowed to wear only the belt-like support part. The practice was instructed to maintain the posture while keeping the focus on the target with the above-mentioned practice posture.

[Test Example 3]
In Test Example 3, the student did not practice at all.

[Evaluation of effect of practice]
The ability of posture control of each student assigned to Test Example 1, Test Example 2, and Test Example 3 was evaluated by the following method. Evaluation was performed at the time before practice (intervention), at the time when one week passed from the start of practice, and at the time when two weeks passed after the practice started.

As an index to evaluate the ability to control the posture, the degree to which the foot pressure center is shaken and the degree to which the knee joint is shaken were adopted. The former is the product of the length of the trajectory drawn by the foot pressure center (referred to as the total trajectory length) and the maximum travel distance in the front-rear direction of the foot pressure center and the maximum travel distance in the left-right direction of the foot pressure center. Area (referred to as a rectangular area).

The total trajectory length and the rectangular area were determined by using values measured with a centroid shaker (Gravicoder GP-7 manufactured by Anima Co.). When measuring the foot pressure center, a sway meter was installed under the mat 6.

The sway of the knee joint was determined using a value measured with a triaxial accelerometer (AS-5TG manufactured by Kyowa Denki Co., Ltd.). In the measurement, a triaxial accelerometer was attached to the radial head of the foot, and the sampling frequency was set to 100 Hz. The oscillating width of the knee joint was determined by measuring the longitudinal, vertical and lateral accelerations with a triaxial accelerometer, and calculating the combined maximum swing width using the three-square theorem. At this time, Root Mean Square (RMS) was used. RMS is the square root of the signal waveform, and RMS of acceleration indicates the average amplitude of the acceleration signal. Therefore, RMS was used as an index indicating the knee joint sway. The greater the RMS value, the greater the fluctuation. RMS is obtained by the following equation (1). Here, α (t) is an acceleration signal, and T is an RMS calculation range time.

The foot pressure center and acceleration were measured as follows. Each student of Test Example 1 to Test Example 3 gets on the mat 6 barefoot. Then, the position of the foot is adjusted so that the tip of the thumb matches the line drawn on the mat 6. As for the line of sight, you will have a gaze at the mark affixed to the wall 2m ahead according to the eye level of each student. Each student of Test Example 1 to Test Example 3 is asked to take a posture (hereinafter referred to as a measurement posture) in which both hands are crossed in front of the chest while standing on one foot on the mat 6. Each student becomes a measurement posture and monitors the center of gravity shake meter to confirm that each student's balance is stable, and measures the foot pressure center and acceleration over 30 seconds.

As described above, the measurement for evaluating the effect of the exercise was performed three times in total, at the time before practice (intervention), 1 week after the start of practice, and 2 weeks after the start of practice. went. The number of measurements at each time was three. And the numerical value obtained by the measurement of 3 times was averaged. The results of Test Example 1 to Test Example 3 are shown in the graphs of FIGS. 4 to 5 for the rectangular area, the total trajectory length, and the knee joint fluctuation. In the graphs of FIGS. 4 to 5, the percentage of increase or decrease after practice is shown with each value of the rectangular area before practice (before intervention), the total trajectory length, or the knee joint motion as 100% (% Before). Internvention;% BI).

As apparent from FIG. 4, in Test Example 1 in which the posture control practice apparatus shown in FIG. 1 was worn and practiced, the rectangular area was about 47% one week after the practice started compared to before practice. There was a decrease, showing a decrease of about 55% after 2 weeks. As shown in FIG. 5, the total trajectory length showed a decrease of about 40% one week after the start of practice, as compared to before practice. As shown in FIG. 6, the knee joint sway showed a decrease of about 15% one week after the start of the exercise and a decrease of about 25% after the second week compared to before the practice.

On the other hand, in Test Example 2 in which the posture control practice device was not used and no visual feedback was given about the position of the knee, as shown in FIG. Later, the rectangular area showed a decrease of about 10%. As shown in FIG. 5, the total trajectory length showed a decrease of about 10% one week after the start of practice, as compared to before practice. As shown in FIG. 6, the knee joint fluctuation showed an increase of about 30% after 2 weeks from the start of practice compared to before practice.

In Test Example 3 in which no posture control practice was performed, as shown in FIGS. 4 and 5, the rectangular area and the total trajectory length remained almost unchanged after two weeks. As shown in FIG. 6, the swing of the knee joint increased by 50% after 2 weeks.

As is clear from the comparison between Test Example 1 and Test Example 3, when the posture control practice device of FIG. 1 was worn on the knee and practiced, the rectangular area and the total trajectory length compared to the other two groups It can be seen that there is a marked decrease in all of the knee joint sway. In the practice method of Test Example 1, the motion of the knee joint located between the hip joint and the foot indirect, which plays a major role in posture adjustment in the standing position, is visualized, and the wearer can quickly sway the foot pressure center and This seems to be because it became possible to control efficiently.

As described above, according to the posture control practice machine and the practice method capable of performing the practice by visually feeding back the position of the knee, the posture control practice of Test Example 2 in which the position of the knee is not visually fed back. In comparison, it became clear that posture control ability can be improved more efficiently and in a shorter time.

DESCRIPTION OF SYMBOLS 1 Posture control training machine 5 Wearer 51 Knee part 11 Irradiation part 12 Support part 15 Reflection part 17

Claims (9)

A wearable posture control practice machine, comprising: a light irradiation unit that indicates a position of a wearer's knee; and a support unit that supports the light irradiation unit on the wearer's body. The wearable posture control practice machine according to claim 1, wherein the irradiating unit irradiates light indicating a position of the knee at a position visible to the wearer. The wearable posture control practice machine according to claim 1, wherein the light is highly directional light. The wearable posture control practice machine according to any one of claims 1 to 3, further comprising a reflection unit that reflects light emitted from the irradiation unit. The wearable posture control practice machine according to claim 4, wherein the reflection portion is disposed at a position of the wearer's knee. The wearable posture control practice machine according to any one of claims 1 to 5, wherein the support portion is a belt-like member made of an elastic material. The wearable posture control practice machine according to any one of claims 1 to 6, wherein the support portion is a belt-like member made of an elastic material and can be fixed to a wearer's leg. The wearable posture control practice machine according to any one of claims 1 to 7, further comprising a target for irradiating light indicating the position of the knee. Irradiate light indicating the position of the knee of the wearer from the irradiation unit attached to the wearer's body,
A posture control practice method in which the wearer adjusts the position of the knee while visually confirming the position of the light spot.

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