JP7108174B2 - WEARABLE INTERFACE, INFORMATION PROVISION DEVICE AND INFORMATION PROVISION METHOD - Google Patents

Description

The present invention relates to a wearable interface, an information providing device and an information providing method.

In order to acquire biomedical signals such as myoelectricity and electrocardiogram, it is necessary to wear bioelectrodes in contact with the human body. Conventionally, a shirt-shaped wearable biointerface equipped with a bioelectrode has been proposed for land sports (see, for example, Non-Patent Document 1). When trying to acquire biosignals underwater by applying electrode technology for land and wearing a swimsuit equipped with similar bioelectrodes, the bioelectrodes are not stable on the skin due to vigorous body movements and water flow resistance. , the biological signal is interrupted or distorted, and a lot of noise is mixed. Furthermore, in water, the biopotential of the body surface caused by internal electromotive force, such as myoelectricity, is significantly attenuated due to the electrical conductivity of the water, which is close to a short circuit.

In order to acquire biosignals, a sticky type bioelectrode is used, but it is easily peeled off and comes off in water. Also, signal distortion increases in water. In order to avoid such a problem, it is necessary to apply waterproof tape or wrap the tape dozens of times so that it does not peel off.

Underwater motion capture, systems that evaluate swimming style and swimmers' conditions from images taken with underwater or above-water cameras wearing optical markers have been put into practical use, but the equipment is complicated and expensive, and it is large-scale to install in the pool. system and not common. Software has been developed to analyze motion capture using a camera, and videos of swimmers captured using a smartphone in a waterproof case or an action camera. However, although it is useful for measuring rough movements and times of swimmers, it is difficult to automate the analysis, such as the separation of underwater and above-water images, splashes, light reflections from wavefronts, image distortion, and masking by bubbles. .

"Development and Practical Application of Functional Material hitoe that Enables Measurement of Biological Information Just by Wearing it", The Institute of Electronics, Information and Communication Engineers, Communication Society Magazine, (2017-2018) No. 41 pp. 17-23

As described above, on land, it is possible to easily acquire the biological signals of athletes, and therefore it is possible to perform evaluations based on the acquired biological signals. However, there is a problem that it is more difficult to obtain biological signals of athletes underwater than to obtain biological signals of athletes on land.

In view of the above circumstances, an object of the present invention is to provide a technique capable of easily acquiring biological signals in water.

In one aspect of the present invention, a plurality of bioelectrodes that acquire biosignals of a subject, a waterproof member provided around the bioelectrodes, and the bioelectrodes provided in each of a plurality of wearable interfaces are arranged in the longitudinal direction of the subject. a wearable interface that secures to the upper and lower skeletal muscles of the long quadriceps or hamstrings, respectively .

One aspect of the present invention is an acceleration sensor that measures the acceleration of the subject, an evaluation unit that evaluates the state of the subject based on the acceleration, and the biological signal obtained from the wearable interface, and the evaluation result is the above . a providing unit for providing information to a subject , wherein the providing unit is an information providing device that feeds back the evaluation result to goggles worn by the subject .

One aspect of the present invention is an evaluation step of evaluating the state of the subject based on the biological signal obtained from the wearable interface, the acceleration of the subject obtained from an acceleration sensor, and the biological signal, and an evaluation result to the subject , wherein in the providing step, the evaluation result is fed back to the goggles worn by the subject .
One aspect of the present invention is an acceleration sensor for measuring the acceleration of the subject, the acceleration, the biosignal obtained from the wearable interface, the subject is worn, for measuring the state of joint motion of the subject An evaluation unit that evaluates the state of the subject based on information on the joint motion of the subject measured by a stretch sensor and pressure information measured by a pressure sensor that is provided in the wearable interface and measures pressure in water. and a providing unit that provides the subject with an evaluation result, wherein the evaluating unit evaluates the flexion state of the wrist joint using information on the joint motion of the subject measured by the stretch sensor, and the pressure The provision unit is an information providing device that evaluates the subject's water retention ability using pressure information measured by a sensor, and feeds back the evaluation result to the goggles worn by the subject.
In one aspect of the present invention, the biological signal obtained from the wearable interface, the subject's acceleration obtained from an acceleration sensor, the biological signal, and the subject's joint motion state are measured. Evaluate the condition of the subject based on information on the joint motion of the subject measured by a stretch sensor for and pressure information measured by a pressure sensor that is provided in the wearable interface and measures pressure in water. an evaluation step and a provision step of providing the evaluation result to the subject, and in the evaluation step, the bending state of the wrist joint is evaluated using information on the joint motion of the subject measured by the stretch sensor. 3. An information providing method for evaluating the water retention capacity of the subject using pressure information measured by the pressure sensor, and feeding back the evaluation result to the goggles worn by the subject in the providing step.

INDUSTRIAL APPLICABILITY According to the present invention, biosignals can be easily acquired in water.

It is a figure which shows the structural example of the wearable interface in this invention. It is a figure which shows the structure of the evaluation system using a wearable interface. It is a figure which shows the structure of the evaluation system using a wearable interface. FIG. 4 is a diagram showing another configuration example (wearable interface) of the wearable interface in the present invention; It is a figure which shows the structure of the evaluation system using a wearable interface. It is a figure which shows the comparison result of this invention and a prior art. FIG. 10 is a diagram showing results of an electromyogram and acceleration when the belt-type wearable interface of the present invention is worn and measured for a long period of time. 8 is an enlarged view of a part of the electromyogram and acceleration results shown in FIG. 7; FIG. FIG. 4 is a diagram showing changes in an electromyogram due to muscle fatigue associated with long-term swimming. FIG. 10 is a diagram showing an example of an evaluation system for measuring myoelectric potentials at other parts of a subject; It is the figure which looked at the subject wearing the harness and the stretch sensor from the side. It is a figure which shows the example at the time of equipping the wearable interface with which an upper limb is mounted|worn with a pressure sensor. 2 is a schematic block diagram showing the functional configuration of an information providing device; FIG. It is a figure for demonstrating the structure implementable by using the evaluation system in this invention. FIG. 10 is a diagram showing an example of a case where distortion is removed by filtering;

FIG. 1 is a diagram showing a configuration example of a wearable interface 10 according to the present invention.
In FIG. 1, FIG. 1A is a diagram showing the overall configuration of the wearable interface 10, FIG. 1B is a diagram showing the inner configuration of the wearable interface 10, and FIG. 1 is a diagram showing a configuration in which a bioelectrode 11 provided in the body is brought into close contact with the skin. FIG.

The wearable interface 10 has a belt-like shape, and acquires biosignals of the subject by being fixed to the body of the subject. Here, the subject is a person from whom biological signals are to be acquired in water. A biological signal is a signal of potential fluctuation from a living body such as an electrocardiogram, an electroencephalogram, and an electromyogram of a subject. The wearable interface 10 is, for example, fixed to any or all of the subject's upper limbs, shoulder blades, trunk, and lower limbs.

A wearable interface 10 includes a plurality of bioelectrodes 11 and a fixing portion 12 .
The bioelectrode 11 is provided inside the wearable interface 10 and acquires a subject's biosignal. The size of the bioelectrode 11 is, for example, about 1 to 4 cm square.
The fixing part 12 is a member for fixing the wearable interface 10 to the subject's body. For example, the fixing part 12 may be a thin openable and closable buckle (a part with a length adjusting function) or a button so as to facilitate adjustment of the tightening pressure.

The wearable interface 10, as shown in FIG. An electrode 11 is provided. In the example shown in FIG. 1B, as one example, the inside of the wearable interface 10 is configured with a pair of bioelectrodes 11 laterally separated by a predetermined distance (for example, 5 mm to 5 cm). A plurality of paired bioelectrodes 111 (for example, paired bioelectrodes 111-1 and paired bioelectrodes 111-2) are provided. A plurality of paired bioelectrodes 111 may be provided at desired positions inside the wearable interface 10 . Also, the pair may be arranged in parallel or concentrically.

The wearable interface 10 is desirably waterproof, but as shown in FIG. may be provided. As the waterproof member 13, vinyl, polyethylene, PVC (polyvinyl chloride), silicone, rubber, and other flexible sheet-like waterproof membranes can be widely used. Adhesiveness may be imparted to the surface of the waterproof member 13 that comes into contact with the skin for reliable adhesion.

As shown in FIG. 1(C), a waterproof member 13 is installed between the bioelectrodes 11 (gap) and around the bioelectrodes 11 , and the waterproof member 13 is brought into close contact with the skin 14 so that the gap between the electrodes is reduced. can be sealed and insulated to obtain a potential difference.

2 and 3 are diagrams showing the configuration of an evaluation system using the wearable interface 10. FIG.
FIG. 2A is a diagram showing the state of the back surface when the wearable interface 10 is attached to the subject 50, and FIG. 2B is a diagram showing an example of a configuration for notifying the subject 50 of the measurement results. .
As shown in FIG. 2A, the wearable interface 10-1 and the wearable interface 10-2 are attached to the lower limbs of the subject 50. FIG. Further, an information providing device 15 is provided near the trunk on the back of the subject 50 .

The information providing device 15 evaluates the condition of the subject 50 based on the biological signal obtained by the wearable interface 10 and provides (feeds back) the evaluation result to the subject 50 . The information providing device 15 has an acceleration sensor and measures the acceleration of the subject 50 . The information providing device 15 is designed to be waterproof and is wireless compatible. As the wireless system, for example, BLE (Bluetooth (registered trademark) Low Energy) or Wi-Fi (Wireless Fidelity) (registered trademark) may be used.
For connection between each wearable interface 10 and the information providing device 15, a connection member such as a metal button, a snap, or a fitting type connector can be used. In order to stabilize signals and improve electrical efficiency, it is desirable that the connection member has a waterproof structure that does not short-circuit through water. A biological signal obtained by each wearable interface 10 is output to the information providing device 15 via the wiring 16 . The wiring 16 is a wiring that has elasticity and is waterproofed.

In addition, as shown in FIG. 2B, the information providing device 15 is connected to the goggles 17 worn by the subject 50 via the wiring 18 . The information providing device 15 provides (feeds back) the evaluation result to the subject 50 by outputting the evaluation result to the goggles 17 . For example, the information providing device 15 provides (feeds back) the evaluation result by color, flashing pattern, image pattern projection, vibration, and vibration pattern. The wiring 18 is a wiring that has elasticity and is waterproofed.

Next, FIG. 3 will be described. FIG. 3(A) is a diagram showing the state of the front surface when the wearable interface 10 is attached to the subject 50, and FIG. 3(B) is a cross-sectional view of the leg portion of the subject 50 wearing the wearable interface 10. .
FIG. 3A shows a state in which the wearable interface 10 is attached to the upper and lower limbs. The bioelectrode 11 of the wearable interface 10 is desirably worn so as to be positioned above the skeletal muscle, as shown in FIG. 3(B).

In FIG. 3B, the bioelectrode 11 is attached so as to be positioned above the quadriceps muscle 21 and above the hamstring muscle 22 . Thereby, the biological signal of the skeletal muscle can be obtained with higher accuracy. A connection member 19 is provided outside the wearable interface 10 . By connecting the connecting member 19 to the connecting member 20 of the wiring 16 extending from the information providing device 15 , the biological signal obtained by the wearable interface 10 is output to the information providing device 15 . Although not shown in FIG. 3B, the wiring 16 extending from the information providing device 15 is also connected to a connecting member 19 provided at a position facing the bioelectrode 11 located above the hamstring muscle 22. be done.

FIG. 4 is a diagram showing another configuration example (wearable interface 10a) of the wearable interface 10 in the present invention.
In FIG. 4, FIG. 4A is a diagram showing the overall configuration of the wearable interface 10a, and FIG. 4B is a diagram showing the internal configuration of the wearable interface 10a.

The wearable interface 10a differs from the wearable interface 10 in that a plurality of wearable interfaces 10a-1 and 10a-2 constitute one wearable interface 10a. Specifically, as shown in FIG. 4B, one wearable interface 10a-1 is provided with a plurality of bioelectrodes 11 and a fixing portion 12. As shown in FIG.

However, unlike the wearable interface 10, the wearable interface 10a does not form the paired bioelectrodes 111 at regular intervals (for example, 5 mm to 5 cm) in the lateral direction, but at regular intervals in the longitudinal direction. The bioelectrode 11 in the wearable interface 10a-1 and the bioelectrode 11 in the wearable interface 10a-2 that are separated from each other form a pair bioelectrode 111a. A plurality of paired bioelectrodes 111a may be provided at desired positions inside the wearable interface 10a.

The wearable interface 10a is desirably waterproof, but the waterproof member 13 may be provided only around the bioelectrode 11 as shown in FIG. 4(B). According to this configuration, the distance between the electrodes can be kept large, so the short circuit between the electrodes due to water is less likely to affect them. Furthermore, by arranging a plurality of electrodes along skeletal muscles such as quadriceps and hamstrings, which are elongated in the longitudinal direction, it is possible to efficiently acquire the myoelectric potential of the target skeletal muscles.

FIG. 5 is a diagram showing the configuration of an evaluation system using the wearable interface 10a. FIG. 5(A) is a diagram showing the state of the front surface when the wearable interface 10a is attached to the subject 50, and FIG. 5(B) is a cross-sectional view of the leg portion of the subject 50 wearing the wearable interface 10a. .
FIG. 5A shows a state in which the wearable interface 10a is attached to the upper and lower limbs. The bioelectrode 11 of the wearable interface 10a is desirably attached so as to be positioned above the skeletal muscle, as shown in FIG. 5(B).

A connection member 19 is provided on the outside of the wearable interface 10a. Similarly to the connection member 19 of the wearable interface 10, the connection member 19 of the wearable interface 10a is also connected to the connection member 20 of the wiring 16 extending from the information providing device 15, thereby forming the wearable interface 10a-1 and the wearable interface 10a-2. The biomedical signal obtained in 1 is output to the information providing device 15 .

FIG. 6 is a diagram showing the results of comparison between the present invention and the prior art. In FIG. 6, the horizontal axis represents time and the vertical axis represents potential.
FIG. 6 shows the results of underwater myoelectricity measured by wearing a conventional shirt-shaped wearable biological interface on the quadriceps muscle of the right leg of the same subject 50 (Comparative Examples 1 and 2). and the result of underwater myoelectricity measured by wearing the belt-type wearable interface 10 according to the present invention. In addition, FIG. 6 shows the results of myoelectricity in water during breaststroke.
As shown in FIG. 6, the underwater myoelectric potential measured when the belt-type wearable interface 10 of the present invention is worn is stably measured without distortion. On the other hand, it can be seen that the results of myoelectricity in water measured by wearing a shirt-shaped wearable biomedical interface according to the prior art show significant signal loss and distortion.

FIG. 7 is a diagram showing results of an electromyogram and acceleration when wearing the belt-type wearable interface 10 according to the present invention and measuring for a long period of time.
FIG. 7 shows an example of electromyographic measurement and acceleration results obtained by wearing the belt-type wearable interface 10 of the present invention on the quadriceps femoris of the subject 50 .
The horizontal axis of the electromyogram shown in FIG. 7 represents time, and the vertical axis represents potential. The horizontal axis of the acceleration data shown in FIG. 7 represents time, and the vertical axis represents acceleration. Also, the example in FIG. 7 shows the results during one hour of swimming. As shown in FIG. 7, it can be seen that the electromyogram and acceleration results are stably measured during one hour of swimming.

FIG. 8 is an enlarged view of a part of the electromyogram and acceleration results shown in FIG.
As shown in FIG. 8, it can be seen that the progress of the body with each stroke and the electromyogram of the quadriceps muscle for each stroke are clearly recorded.

FIG. 9 is a diagram showing changes in an electromyogram due to muscle fatigue caused by swimming for a long time.
As shown in FIG. 9, a relatively small and well-formed myoelectric waveform is recorded at the start of swimming. Looking at the waveforms 20 minutes after the start of swimming and 40 minutes after the start of swimming, it is observed that the shape of the myoelectric potential becomes irregular and the myoelectric potential increases. With muscle fatigue, variation in muscle activity increases, and in order to compensate for the decrease in exercise capacity caused by fatigue, more muscles (motor units) than at the start of exercise are recruited to increase the number of muscles (Fig. 7). Similar changes to those on land have been observed in water. Muscle fatigue can be estimated from this change.

FIG. 10 is a diagram showing an example of an evaluation system for measuring myoelectric potentials at other locations of the subject 50. As shown in FIG. Here, the other parts of the subject 50 are shoulders and upper arms. In the evaluation system shown in FIG. 10, a wearable interface 10 having a structure similar to that of the wearable interface 10 shown in FIG. is shown. The wearable interface 10a shown in FIG. 4 may be used instead of the wearable interface 10 shown in FIG. 1, or both the wearable interface 10 and the wearable interface 10a may be used. 10A is a diagram showing the state of the back of the subject 50, and FIG. 10B is a diagram showing the state of the front of the subject 50. FIG.

Furthermore, in the evaluation system shown in FIG. 10, the subject 50 is equipped with a stretch sensor 24 for measuring the myoelectric potential of the shoulder and upper arm, and at the same time measuring the state of the shoulder joint movement. It shows an example of analyzing an activity.
As the stretch sensor 24, a commercially available sensor for measuring various degrees of stretch can be used. By connecting the harness 23 with these sensors as a fulcrum and the band around the joint, it is possible to know the movement of the shoulder joint (see FIG. 11). The number of stretch sensors 24 is not particularly limited, but since the shoulder joint elevation and the scapula elevation (upward elevation) can be known from the extension of the stretch sensors 24, for example, fatigue, joint dysfunction, etc. can cause shoulder movement. If the ability is declining, the situation can be known. A swimmer's condition can be understood comprehensively from shoulder movement, trunk acceleration, and muscle activity.

FIG. 12 is a diagram showing an example in which the wearable interface 10 worn on the upper limb is provided with the pressure sensor 25. As shown in FIG.
As shown in FIG. 12, the wearable interface 10 is further provided with a pressure sensor 25, and by attaching it to the upper limb, the pressure during swimming can be measured. In the example shown in FIG. 12, a wearable interface 10 having a pressure sensor 25 is attached to the flexor side in order to measure the ability to catch water for each stroke, and the wearable interface 10 is equipped with a pressure sensor 25 in order to know the movement of the arm that acts as a brake during swimming. An example of wearing a wearable interface 10 having a pressure sensor 25 on the extension side is shown. The wearable interface 10 including the pressure sensor 25 may be worn only on either the flexor side or the extensor side.

These pressure sensors 25 can be pressure sensors such as surface pressure sensors, strain gauges, and balloon pressure sensors. Practically, a flexible surface pressure sensor is most desirable in terms of thickness and safety. For example, by providing a surface pressure sensor outside the wearable interface 10, pressure can be measured simultaneously. A swimmer's ability to catch water efficiently (skill) can be known from changes in pressure on the flexion side, and the ability to suppress resistance and avoid deceleration can be known from changes in pressure on the extension side. The condition and skill of the swimmer can be evaluated from these pressure data, the aforementioned electromyogram, and the acceleration of the body axis.

FIG. 13 is a schematic block diagram showing the functional configuration of the information providing device 15. As shown in FIG.
The information providing device 15 includes a CPU (Central Processing Unit), a memory, an auxiliary storage device, etc., which are connected via a bus, and executes a providing program. The information provision device 15 functions as a device including an acceleration sensor 150 , an acquisition unit 151 , a storage unit 152 , an evaluation unit 153 and an information provision unit 154 by executing the provision program. All or part of each function of the information providing device 15 may be realized using hardware such as ASIC (Application Specific Integrated Circuit), PLD (Programmable Logic Device), FPGA (Field Programmable Gate Array), and the like. . Also, the provided program may be recorded on a computer-readable recording medium. Computer-readable recording media include portable media such as flexible disks, magneto-optical disks, ROMs and CD-ROMs, and storage devices such as hard disks incorporated in computer systems. Also, the provided program may be transmitted and received via an electric communication line.

Acceleration sensor 150 measures the acceleration of subject 50 .
Acquisition unit 151 acquires various types of information. For example, the acquisition unit 151 obtains biological signals (electromyogram, electrocardiogram (e.g., heart rate)) measured by the wearable interface 10, acceleration measured by the acceleration sensor 150, and information on joint motion by the stretch sensor 24 ( range of motion, flexion progression and twisting motion) and pressure information measured by the pressure sensor 25 are acquired. The acquisition unit 151 causes the storage unit 152 to store the acquired various information. Depending on the equipment worn by the subject 50, the acquisition unit 151 acquires any one of biosignals, acceleration, joint motion information, and pressure information.

The storage unit 152 stores various information acquired by the acquisition unit 151 . The storage unit 152 may be, for example, a volatile storage device or a non-volatile storage device.
The evaluation unit 153 evaluates the condition of the subject 50 based on various information stored in the storage unit 152 . For example, the evaluation unit 153 evaluates (estimates) the pitch, stroke, swimming speed, muscle activity rhythm, muscle activity, efficiency, water flow resistance, stroke efficiency, and the like from feature amounts based on various types of information. Furthermore, the evaluation unit 153 evaluates exercise cost (swimming efficiency), muscle fatigue, recovery from fatigue, central fatigue, and poor physical condition by calculating past data and current data.

Especially in the freestyle, it is possible to evaluate whether the water is caught in the wrist flexion position of the upper limb at a position as far as possible from the trunk, and whether the stroke is maintained for a long time and the propulsion force is generated efficiently from the trunk acceleration. Furthermore, the evaluation unit 153 evaluates the flexion state of the wrist joint based on the joint motion information obtained from the stretch sensor 24, and evaluates the water retention ability from the pressure on the flexion side. Furthermore, the evaluation unit 153 evaluates the rhythm of muscle activity, the degree of fatigue, the degree of recovery, etc., based on the propulsive force and the electromyographic results of the upper arm.

The information provision unit 154 provides the subject 50 with the evaluation result by the evaluation unit 153 in a predetermined manner. The predetermined mode is light, vibration, sound, image, or the like. For example, the information providing unit 154 feeds back the condition of the arm obtained from the rhythm of muscle activity, the degree of fatigue, and the degree of recovery. Furthermore, the information providing unit 154 provides the test subject 50 with values and changes in evaluation results such as pitch, stroke, swimming speed, muscle activity rhythm, muscle activity, efficiency, water flow resistance, and stroke efficiency obtained from the feature amount.

FIG. 14 is a diagram for explaining a configuration that can be implemented by using the evaluation system of the present invention.
The contents within the "underwater" frame shown in FIG. 14 represent the contents that can be performed underwater. The “land” portion shown in FIG. 14 represents what can be done on land. As shown in FIG. 13, the information providing device 15 stores various information. Therefore, after collecting the information providing device 15, by analyzing various types of information on land, optimization of team competitions and the like and training strategies can be planned from the data of a plurality of players.

According to the wearable interface 10 (or 10a) configured as described above, the bioelectrode 11 is provided inside the wearable interface 10 (or 10a) to prevent a short circuit, and the wearable interface 10 (or 10a) is attached to the subject 50 . Therefore, biometric information can be easily obtained even in water.

Conventionally, in the case of underwater, feedback of measurement results has been more difficult than in athletics. On the other hand, in the evaluation system of the present invention, the information providing device 15 and the goggles 17 worn by the subject 50 are connected, and the evaluation results are fed back from the information providing device 15 to the goggles 17 worn by the subject 50. do. Thereby, the measurement result can be fed back even in water. In addition, by giving feedback during training in this way, it is possible to learn how to swim efficiently while swimming, and to efficiently improve physical endurance and athletic ability.

(Modification)
The bioelectrode 11 is desirably placed directly above the skeletal muscle, but may be located away from the target muscle. In addition, the information providing device 15 attaches the wearable interface 10 (or 10a) to separate limbs through the body, such as the right and left hands, the right hand and the left leg, and estimates the movement of skeletal muscles from the potential difference between the electrodes and the movement of the body. You may

When a competitive swimmer exercises, it is inevitable that biosignals will be distorted due to deformation of the skin/skeletal muscle/electrodes due to strong water flow resistance. Therefore, the information providing device 15 may be configured to include a filter and remove the distortion by the filter. When configured in this manner, the information providing device 15 includes a noise removal filter and a high-pass filter as filters. The noise removal filter may be provided after the acquisition unit 151 to remove noise contained in the acquired biological signal, or may be provided between the storage unit 152 and the evaluation unit 153 and stored in the storage unit 152. You may remove the noise contained in the biological signal currently being received. A noise elimination filter is, for example, a Wiener filter. A high-pass filter is provided after the noise removal filter. The high-pass filter removes low-frequency components contained in the biosignal after noise removal.

FIG. 15 is a diagram showing an example when distortion is removed by filtering.
The electromyogram shown in FIG. 15 includes baseline noise (acoustic waves in water, bubbles, impulsive noise such as cavitation). Since the baseline noise is relatively high frequency and has a certain characteristic, the noise is removed as shown in the electromyogram after noise removal shown in FIG. 15 by removing the background noise with the noise removal filter. In addition, in water, the biosignal is distorted (relatively low frequency) due to the deformation of the skin/skeletal muscle/electrode due to the water flow resistance received at each stroke. This is removed by applying a high pass filter. FIG. 15 shows an example in which distortion components are removed by a 10 Hz, 48 oct spatial filter (electromyogram after application of a high-pass filter).
By performing the above processing, myoelectric potential signal processing can be performed in the same manner as on land.

Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and designs and the like are included within the scope of the gist of the present invention.

DESCRIPTION OF SYMBOLS 10, 10a... Wearable interface, 11... Biomedical electrode, 12... Fixing part, 13... Waterproof member, 15... Information provision apparatus, 16... Wiring, 17... Goggles, 18... Wiring, 19... Connection member, 20... Connection member, 21... quadriceps muscle, 22... hamstring muscle, 23... harness, 24... stretch sensor, 25... pressure sensor, 150... acceleration sensor, 151... acquisition unit, 152... storage unit, 153... evaluation unit, 154... information provision Department

Claims (2)

an acceleration sensor that measures the acceleration of the subject;
the acceleration and,hareA biosignal obtained from a wearable interface, information about the joint motion of the subject measured by a stretch sensor attached to the subject and measuring the state of the joint motion of the subject, and provided in the wearable interface , an evaluation unit that evaluates the condition of the subject based on pressure information measured by a pressure sensor that measures pressure in water;
a providing unit that provides the subject with an evaluation result;
with
The wearable interface includes a plurality of bio-electrodes for acquiring bio-signals of a subject,
Fixation by fixing a waterproof member provided around the bioelectrode and the bioelectrode provided in each of a plurality of wearable interfaces to the upper and lower portions of the quadriceps or hamstring skeletal muscles that are elongated in the longitudinal direction of the subject. and
The evaluation unit evaluates the bending state of the wrist joint using information about the joint motion of the subject measured by the stretch sensor, and estimates the water retention capacity of the subject using pressure information measured by the pressure sensor. evaluate and
The providing unit is an information providing device that feeds back the evaluation result to the goggles worn by the subject. A plurality of bioelectrodes that acquire biosignals of a subject, a waterproof member provided around the bioelectrodes, and the bioelectrodes provided in each of a plurality of wearable interfaces are attached to the subject's long quadriceps or ham. a fixing part for fixing to the upper part and the lower part of the skeletal muscle of the string, respectively. the biosignal obtained from the wearable interface;
The subject's acceleration obtained from an acceleration sensor, the biosignal, information about the subject's joint motion measured by a stretch sensor worn on the subject for measuring the state of the subject's joint motion, and the wearable. an evaluation step of evaluating the condition of the subject based on pressure information measured by a pressure sensor provided in the interface and measuring pressure in water;
a providing step of providing an evaluation result to the subject;
has
In the evaluation step, the bending state of the wrist joint is evaluated using the information about the joint motion of the subject measured by the stretch sensor, and the water retention ability of the subject is evaluated using the pressure information measured by the pressure sensor. evaluate and
A method of providing information, wherein in the providing step, the evaluation result is fed back to goggles worn by the subject.

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