System for easily visualizing the position of the center of gravity of a person, and method for easily visualizing the position of the center of gravity of a person

Abstract

To provide a simple visualization system of a human body centroid position, capable of detecting not only a load in a horizontal direction but also a load in a vertical direction, by only gripping a load detector by a subject, the load detector being separated from the subject by a prescribed distance, correctly calculating and displaying a position of a centroid of the subject, and having a simplified structure.SOLUTION: There is provided a simple visualization system for a human body centroid position, comprising: a load detector having a tip part and a sensor part; a calculation part calculating a position of a centroid; a display part displaying the position of the centroid, the calculation part calculates the position of the centroid, on the basis of a load detected by the sensor part on the load detector, and a second load which is generated on a body weight action point where the body weight of the subject is applied to a floor surface other than the tip part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a system for easily visualizing the position of the center of gravity of a human body and a method for easily visualizing the position of the center of gravity of a human body. [Background technology]

[0002] A known center of gravity stability system includes a force plate equipped with a tabletop and a three-component load cell, and a data processor that measures the movement of the subject's center of gravity based on load data output from the three-component load cell. The tabletop is provided with stepping reference markers. The data processor includes a CPU that calculates stepping position-related parameters for multiple stepping movements based on the stepping positions on the tabletop. The CPU calculates absolute coordinates of the sole of each foot's contact point during each stepping movement, with a predetermined position on the tabletop as the origin, and calculates the center position and the front-rear and left-right variations in the sole of each foot's contact point during the multiple stepping movements (see, for example, Patent Document 1).

[0003] Also known is a balance ability measuring device that includes a load sensor that detects the load acting on the measurement surface, a center of gravity detection device that detects the position of the center of gravity of the subject based on the detection signal from the load sensor, a pressure distribution sensor having multiple pressure detection units arranged on the measurement surface, a foot pressure area detection device that detects the foot pressure action area of ​​the subject based on the detection signal from the pressure distribution sensor, a reference width dimension setting device that sets the reference width dimension of the foot pressure action area in the center of gravity displacement direction based on the detection signal of the foot pressure action area, a center of gravity displacement amount calculation device that calculates the amount of displacement of the center of gravity of the subject based on the width dimension ratio of the foot pressure action area to the reference width dimension of the foot pressure action area, and a display device that externally displays the measurement results based on the amount of displacement of the center of gravity position calculated by the center of gravity displacement amount calculation device (see, for example, Patent Document 2).

[0004] In general, the position of the center of gravity of the human trunk is important from the perspective of posture, standing stability, or fall risk assessment. Furthermore, from this perspective, the position of the center of gravity when a person is performing some kind of movement is more important than the position of the center of gravity when the person is maintaining a stable standing posture. The center of gravity stabilization systems and balance ability measurement devices shown in the above-mentioned patent documents are typically used by a person standing on them, and measure the position of the center of gravity of the human trunk using multiple sensors attached to the parts of the body where the soles of the feet come into contact. Here, the center of gravity stabilization systems and balance ability measurement devices shown in the above-mentioned patent documents can obtain information on the load acting horizontally on the soles of the feet, but cannot obtain information on the load acting vertically, making the information unclear. Since a lower center of gravity results in more stable posture, it is important to obtain the vertical position of the center of gravity.

[0005] Known techniques, such as motion capture, can be used to obtain information about the position of the center of gravity in the vertical direction, i.e., information about whether the center of gravity is high or low. However, using such techniques can present challenges, such as limited installation locations and the need for high-cost systems. These challenges become particularly pronounced when load cells (load detectors) are used in contact with the soles of the feet. Furthermore, because such devices require a model of a healthy human body, accurate calculation of the center of gravity may not be possible in cases where the person has physical disabilities. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-056278 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-209546 [Patent Document 3] Japanese Patent Application Laid-Open No. 2016-179048 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above-mentioned problems, and its ultimate objective is to provide a simple system for visualizing the position of the center of gravity of a human being, which has a simple structure and can detect loads applied not only horizontally but also vertically, and accurately calculate and display the position of the center of gravity of the subject, simply by having the subject hold a load detector at a predetermined distance. [Means for solving the problem]

[0008] To solve the above problems, the present invention provides: A simple visualization system for human center of gravity position that calculates the position of the center of gravity in the body of a subject and visualizes the position of the center of gravity, a load detector having a tip portion that the subject holds with any of the limbs or on which the subject places any of the limbs, and a sensor portion that detects a load acting on the tip portion; a calculation unit that calculates the position of the center of gravity based on information about the load detected by the sensor unit of the load detector; a display unit that displays the position of the center of gravity calculated by the calculation unit; Equipped with The calculation unit is a simple visualization system for the position of the center of gravity of a human being, characterized in that it dynamically calculates the position of the center of gravity based on the load detected by the sensor unit in the load detector and a second load generated at the point of application of the body weight where the subject applies their weight to the floor surface other than the tip.

[0009] According to the present invention, the position of the center of gravity of a subject can be calculated and displayed simply and accurately. Furthermore, the simplified system for visualizing the position of the center of gravity of a human being according to the present invention only requires a single load detector, resulting in a simple structure. Therefore, the system is easily portable, and the position of the center of gravity of a subject can be calculated regardless of location, such as on the floor. The position of the center of gravity displayed on the display unit may be displayed as a point on a coordinate system or may be displayed as a numerical value.

[0010] Furthermore, in the present invention, the simplified system for visualizing the position of the center of gravity of a human may be characterized in that the calculation unit further calculates the position of the center of gravity at the distal end based on the height from the floor of a contact position where the subject grips with any of the limbs or places any of the limbs, the horizontal distance between the contact position and the point of application of the body weight, and the body weight of the subject. Here, the height from the floor of the contact position, the horizontal distance between the contact position and the point of application of the body weight, and the body weight of the subject may be input in advance as known values. This simplifies the calculations in the calculation unit, making it possible to more easily and accurately detect loads and calculate the position of the center of gravity of the subject.

[0011] Furthermore, in the present invention, the system for easily visualizing the position of the center of gravity of a human may be characterized in that the tip of the load detector has a predetermined low-moment shape that is unlikely to generate a rotational moment when the subject grasps it with any of the limbs or places any of the limbs on it. This makes it possible to ignore the rotational moment when calculating the position of the center of gravity, and by further simplifying the model, the position of the center of gravity can be calculated more easily.

[0012] Furthermore, in the present invention, the system for easily visualizing the position of the center of gravity of a human may be characterized in that the low-moment shape is a plate-like shape extending in the vertical direction, which makes it difficult for a rotational moment to occur at the tip.

[0013] Furthermore, in the present invention, the display unit may be configured to display a continuous movement trajectory of the center of gravity before the calculation of the center of gravity by the calculation unit, thereby enabling the degree of movement of the center of gravity to be grasped, and for example, if the degree of movement of the center of gravity is large, it can be determined that the subject's posture is likely to be unstable.

[0014] Furthermore, the present invention may be a simplified system for visualizing a human center of gravity position, further comprising an imaging device that captures an image of the subject, wherein the display unit displays a moving image of the subject captured by the imaging device and, superimposed on the moving image, displays the position of the center of gravity calculated by the calculation unit and / or a continuous movement trajectory of the position of the center of gravity prior to the time when the position was calculated by the calculation unit. In this way, the display unit can display not only the calculation result of the center of gravity position but also the image of the subject, making it easier to grasp the position of the center of gravity of the subject more clearly.

[0015] In addition, in the present invention, A simple method for visualizing a human center of gravity position, which calculates the position of the center of gravity in a body of a subject and visualizes the position of the center of gravity, An input step in which parameters that form the basis of load information are input in advance; a load detection step in which the subject grasps a tip portion of a load detector capable of detecting loads in a vertical direction and a horizontal direction with any of the limbs or places any of the limbs on the tip portion to detect the load; a center-of-gravity position calculation step of calculating the position of the center of gravity based on information about the load detected in the load detection step; a center of gravity position visualization step of displaying the position of the center of gravity calculated in the center of gravity position calculation step; and The method may also be a simple method for visualizing the position of the center of gravity of a person, characterized in that in the center of gravity position calculation step, the position of the center of gravity is dynamically calculated based on the load detected in the load detection step and a second load generated at the point of application of the body weight where the subject applies their weight to the floor surface other than the tip.

[0016] According to the present invention, the position of the center of gravity of a subject can be calculated and displayed accurately in simple steps.

[0017] Furthermore, the present invention may be a simple method for visualizing a position of a human center of gravity, characterized in that in the center of gravity position calculation step, the position of the center of gravity is calculated at the tip portion based on the height from the floor surface of a contact position where the subject grips with any of the limbs or places any of the limbs, the horizontal distance between the contact position and the point of application of the body weight, and the body weight of the subject. This makes it possible to detect load and calculate the position of the center of gravity of the subject more simply and accurately.

[0018] Furthermore, the present invention may be a simple method for visualizing the position of the center of gravity of a human, characterized in that in the center-of-gravity position calculation step, the position of the center of gravity is calculated while ignoring a rotation moment generated at the tip portion that can be detected in the load detection step. This makes the calculation in the center-of-gravity position calculation step easier, and makes the calculation result of the center of gravity position easier to understand.

[0019] In the present invention, the center of gravity position calculation step uses the contact position and the weight application point as two points that support the body of the subject, and calculates a vertical position of the contact position. The method may be characterized in that a resultant force of the load generated in the horizontal direction and the load generated in the vertical direction at the point of application of the body weight is defined as a first load vector, a resultant force of the second load generated in the vertical direction at the point of application of the body weight and the second load generated in the horizontal direction is defined as a second load vector, and an intersection of the first load vector and the second load vector is defined as the position of the center of gravity. According to this method, since only two types of load vectors are required as information for calculating the position of the center of gravity, the position of the center of gravity can be calculated with a smaller system capacity and the position of the center of gravity can be determined in a shorter time.

[0020] Furthermore, the present invention may be a simple visualization method for a human center of gravity position, characterized in that the center of gravity position visualization step further displays a continuous movement trajectory of the center of gravity position before the point in time when the center of gravity position is calculated in the center of gravity position calculation step. This makes it easy to grasp changes in the center of gravity position at a glance.

[0021] Furthermore, the present invention may be a simple method for visualizing a human center of gravity position, characterized in that in the center-of-gravity position visualizing step, the subject imaged in the load detecting step is displayed as a moving image, and the position of the center of gravity calculated in the center-of-gravity position calculating step and / or a continuous movement trajectory of the position of the center of gravity before the point in time at which it was calculated in the center-of-gravity position calculating step are displayed superimposed on the moving image. According to this, since not only the calculation result of the center of gravity position but also the image of the subject can be displayed on the display unit, the position of the center of gravity of the subject can be more clearly grasped.

[0022] The above-mentioned means for solving the problems can be used in combination with each other as much as possible. [Effects of the Invention]

[0023] According to the present invention, by simply having the subject hold a load cell at a predetermined distance, it is possible to detect loads applied not only horizontally but also vertically. As a result, the position of the subject's center of gravity can be accurately calculated when the subject changes position or loses balance, which can be used to prevent falls, for example. Furthermore, although the prototype of the simple method for visualizing the position of the human center of gravity is two-dimensional, if a similar simple system for visualizing the position of the human center of gravity is applied to three dimensions, it can calculate the position of the center of gravity during three-dimensional movements, which can be applied to fields such as sports medicine.

[0024] The present invention also achieves the following secondary effect by adding other limiting factors. That is, the system for easily visualizing the position of the center of gravity of a person according to the present invention is equipped with an image capture device, which can capture an image of the subject and display it as a moving image, and can display the position of the subject's center of gravity in the moving image. As a result, it becomes easier for the subject to grasp the position of their center of gravity. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a schematic diagram illustrating an example of a simple visualization system for the position of the center of gravity of a person according to the first embodiment. [Figure 2] FIG. 2 is an explanatory diagram showing a mode of detecting a load using the simple visualization system for the position of the center of gravity of a person in the first embodiment. [Figure 3] FIG. 3 is a schematic diagram showing a method for calculating the position of the center of gravity of a subject using the simple system for visualizing the position of the center of gravity of a human being in the first embodiment. [Figure 4] FIG. 4 is an explanatory diagram showing an example of a calculation result of the position of the center of gravity displayed on a display of a PC in the simple visualization system for the position of the center of gravity of a person in the first embodiment. [Figure 5] FIG. 5 is a flowchart showing a method for easily visualizing the position of the center of gravity of a human being using the system for easily visualizing the position of the center of gravity of a human being in the first embodiment. [Figure 6] FIG. 6 is a schematic diagram illustrating an example of a simple visualization system for the position of the center of gravity of a person according to the second embodiment. [Figure 7]FIG. 7 is an explanatory diagram showing a mode of detecting a load using a simple visualization system for a position of the center of gravity of a person according to the second embodiment. [Figure 8] FIG. 8 is an explanatory diagram showing an example of a calculation result of the position of the center of gravity displayed on a display of a PC in the simple visualization system for the position of the center of gravity of a person in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] Example 1 A system for easily visualizing the position of the center of gravity of a human being and a method for easily visualizing the position of the center of gravity of a human being according to a first embodiment of the present invention will be described in detail below with reference to the drawings. Note that the following embodiment is merely an example of the system for easily visualizing the position of the center of gravity of a human being and the method for easily visualizing the position of the center of gravity of a human being according to the present invention, and is not intended to limit the configuration, shape, structure, method, etc. In the following embodiment, a system for easily visualizing the position of the center of gravity of a human being will be described, which can detect loads applied not only in the horizontal direction but also in the vertical direction by having a subject hold a load detector, and which calculates and displays the position of the center of gravity of the subject based on the load information.

[0027] <Device configuration> FIG. 1 is a schematic diagram showing an example of the overall configuration of a simplified visualization system 1 for human center of gravity according to an embodiment of the present invention. The simplified visualization system 1 for human center of gravity according to an embodiment of the present invention includes a load cell unit 2 as a load detector, a PC 3, and an A / D board 4. When measuring the position of the center of gravity, the subject lightly grasps the tip of the load cell unit 2 with their fingertips so as to apply a load to the load cell unit 2. The load cell unit 2 detects the load generated when the subject grasps its tip (described below). The structure of the load cell unit 2 will be described below with reference to FIG. 2. The PC 3 acquires information about the load detected by the load cell unit 2, and a CPU 31 serving as a calculation unit calculates the position of the subject's center of gravity based on the load information. The PC 3 also visualizes the position of the center of gravity by displaying the calculation results on a display 32 serving as a display unit. The A / D board 4 is connected to the load cell unit 2 and the PC 3. The A / D board 4 samples the analog signal transmitted by the load cell unit 2, converts it into digital data, and then transmits the digital data to the PC 3. The connection between the load cell unit 2 and the A / D board 4, and the connection between the PC 3 and the A / D board 4 may be wired or wireless. If the load cell unit 2 is capable of outputting digital data, the A / D board 4 is not required as a component of the simple visualization system 1 for the position of the center of gravity of a person.

[0028] FIG. 2 is an explanatory diagram showing how a load is detected using the simplified visualization system 1 for human center of gravity position according to an embodiment of the present invention. The A / D board 4 is not shown in FIG. 2. The load cell unit 2 has a tip 21 and a sensor 22. When a subject measures the position of the center of gravity, the subject grasps the tip 21, for example, as shown in FIG. 2, and the sensor 22 detects the load acting on the tip 21. This load information is transmitted to the PC 3, which then calculates the position of the center of gravity from this load information. The PC 3 displays the calculated position of the center of gravity on the display 32. The display 32 can also display the position of the center of gravity at the calculated time, along with the continuous movement trajectory of the center of gravity position over a predetermined period of time prior to that time. Details will be explained in FIG. 4 below.

[0029] The tip portion 21 has a generally plate-like shape extending in the vertical direction. Its thickness may be, for example, 10 mm or less. It may also be formed so as to taper towards the tip. Furthermore, the periphery may be covered with an elastic member. The subject holds the tip of the tip portion 21 by lightly pinching it with the tips of several fingers. For this reason, a rotational moment is unlikely to occur at the point where the subject holds the tip portion 21, and it becomes possible to ignore the influence of the rotational moment when the sensor unit 22 detects the load acting on the tip portion 21. The sensor unit 22 comprises a first load cell 22a that detects a load in the vertical direction (also called the Z direction) and a second load cell 22b that detects a load in the horizontal direction (also called the X direction). The load cell 22b detects the load acting in the vertical direction relative to the point where the subject grips the tip portion 21 (F1 shown in FIG. 2) and the load acting in the horizontal direction relative to the point where the subject grips the tip portion 21 (f1 shown in FIG. 2).

[0030] When the position of the center of gravity of a subject is calculated using the simple human center of gravity position visualization system 1, a load is also generated at the point where the subject supports their weight (the point where the left foot is placed in FIG. 2) other than the tip 21. Specifically, a load (F2 shown in FIG. 2) acts vertically relative to the point where the weight is supported, and a load (f2 shown in FIG. 2) acts horizontally relative to the point where the weight is supported. The CPU 31 of the PC 3 performs calculations on F2 by subtracting F1 from the subject's weight, and on f2 by inverting f1. Here, F2 and f2 correspond to the second load in the present invention.

[0031] In the simple visualization system 1 for human center of gravity position, the position of the center of gravity is calculated based on the following three pieces of information that are input in advance into the data input unit (not shown) of the PC 3. The first piece of information is the weight of the subject, as described above. The second piece of information is H shown in Figure 2. H is the vertical distance between the point where the subject grips the tip portion 21 and the floor. The third piece of information is D shown in Figure 2. D is the horizontal distance between the point where the subject grips the tip portion 21 and the point where the subject's weight is supported elsewhere than the tip portion 21 (the floor in this embodiment). The second load cell 22b is installed so that it can detect a force in the direction connecting the point where the subject grips the tip portion 21 and the point where the subject's weight is supported elsewhere than the tip portion 21, as a horizontal load.

[0032] It should be noted that the manner of detecting a load shown in Fig. 2 is merely one example. For example, instead of gripping the tip portion 21, one foot may be placed on the tip portion 21. Alternatively, instead of standing on the floor with one foot, one may stand with both feet together, or may sit on a chair, etc. Furthermore, the shape of the tip portion 21 is not limited to the shape shown in Fig. 2, as long as it is a shape that does not easily generate a rotational moment. For example, it may be a cylindrical shape extending vertically with a diameter of approximately 10 mm or less.

[0033] <Measurement method> FIG. 3 is a schematic diagram showing a method for calculating the position of the center of gravity of a subject using the simplified human center of gravity position visualization system 1 in Example 1. When calculating the position of the center of gravity of a subject in the manner shown in FIG. 2, two points are modeled in a very simplified manner as two points supporting the subject's body: the point where the subject grasps the tip portion 21 (point A shown in FIG. 3) and the point where the subject applies their weight to the floor surface other than the tip portion 21 (point B shown in FIG. 3). Note that the loads F1, f1, F2, f2, H, and D shown in FIG. 3 are the same as those shown in FIG. 2. Also, as shown in FIG. 3, F1, F2, and H are the load and dimension applied in the Z direction, and f1, f2, and D are the load and distance applied in the X direction. Here, point A corresponds to the contact position in the present invention. Point B corresponds to the body weight application point in the present invention.

[0034] As described above, when the subject grasps the distal end portion 21, three pieces of information, namely the subject's weight, H, and D, are input in advance into the data input section of PC 3. In this case, the vertical direction F2 and horizontal direction f2 generated at point B are determined based on the vertical direction F1 and horizontal direction f1 generated at point A. Then, when the angle formed by the resultant force of F1 and f1 with respect to the horizontal direction is θ1, and the angle formed by the resultant force of F2 and f2 with respect to the horizontal direction is θ2, the following equations (1) and (2) hold. tanθ1=F1 / f1 θ1=arctan(F1 / f1) (1) tanθ2=F2 / f2 θ2=arctan(F2 / f2) (2)

[0035] As described above, the values ​​of θ1 and θ2 can be found from the information on the loads F1, f1, F2, and f2. Then, the intersection point G of the resultant force of F1 and f1 and the resultant force of F2 and f2 can be found on the coordinate plane. This intersection G is the position of the subject's center of gravity. In this way, the position of the center of gravity can be calculated not only in the horizontal direction but also in the vertical direction. Here, the resultant force of F1 and f1 corresponds to the first load vector in this invention. Similarly, the resultant force of F2 and f2 corresponds to the second load vector in this invention.

[0036] <System configuration> FIG. 4 is an explanatory diagram showing an example of a screen displayed on the display 32 of the PC 3 in the simplified visualization system 1 for human center of gravity position in Example 1. The display 32 of the PC 3 displays the position of the center of gravity of the subject and load information acquired by the CPU 31 of the PC 3. The position of the center of gravity of the subject calculated based on the load information is displayed on a coordinate plane with the direction D (horizontal direction) and the direction H (vertical direction) shown in FIG. 2 as two axes. Since the position of the center of gravity is continuously measured over time, as described above, the position of the center of gravity at the time of calculation by the CPU 31 can be displayed on the coordinate plane. Furthermore, a continuous movement trajectory of the center of gravity position over a predetermined period prior to the time of calculation by the CPU 31 can be displayed. A mark indicating the position of the center of gravity at the time of calculation by the CPU 31 may be displayed in a different color from a mark indicating a continuous movement trajectory, for example, so that it is clear that it is the position of the center of gravity at that time. Note that the coordinates indicating the position of the center of gravity may be displayed numerically. Furthermore, data related to the position of the center of gravity may be recorded in the load cell unit 2. Furthermore, the continuous movement locus of the center of gravity position may not be displayed on the coordinate plane, and only the position of the center of gravity at that time may be displayed.

[0037] The center of gravity position is displayed not only horizontally but also vertically, allowing the subject to grasp the height of the center of gravity. Compared to when the center of gravity position is displayed only horizontally, this allows the subject to more accurately grasp the center of gravity position when changing posture or losing balance, which can be used to prevent falls, for example. Generally, when a person falls, they unconsciously try to grab something. For example, as the hands are moved away from the body, the center of gravity moves beyond the upper soles of the feet. If this limit is exceeded, the subject falls. At this time, the subject may take protective action, such as bending over. Using the simplified human center of gravity visualization system 1 according to this embodiment, the above-mentioned movements can be evaluated by conducting a test in which the load cell unit 2 is slid horizontally and vertically away from the subject's body. If the load cell unit 2 moves away from the body beyond a certain point, the subject will be unable to maintain posture. Evaluating the movements during this process can lead to the evaluation and management of accidental events such as falls. The simple visualization system 1 for human center of gravity position may have an actuator such as a motor so that the load cell unit 2 slides automatically.

[0038] Note that "Start" in Fig. 3 displays the elapsed time after the start of calculation of the center of gravity position, "Loadcell X" and "Loadcell Z" display the values ​​of f1 and F1 shown in Fig. 2, and "BodyGC X" and "BodyGC Z" display the values ​​of f2 and F2 shown in Fig. 2. These notations are merely examples, and other notations may be used as long as they have a similar meaning.

[0039] <Flowchart> FIG. 5 is a flowchart showing a simple method for visualizing the position of the center of gravity of a human being using the simple visualization system 1 for visualizing the position of the center of gravity of a human being according to an embodiment of the present invention. The flow of the simple visualization method for visualizing the position of the center of gravity of a human being will be explained below with reference to FIG. 5. In this flowchart, first, the subject inputs parameters that form the basis of the load information into the data input unit of the PC 3 (S101). The parameters that form the basis of the load information are the subject's weight, H shown in FIG. 2, and D shown in FIG. 2. Here, S101 corresponds to the input step in the present invention. When the subject grasps the tip 21 of the load cell unit 2, the sensor unit 22 of the load cell unit 2 detects the loads F1 and f1 based on the three parameters (S102). Here, S102 corresponds to the input step in the present invention. This corresponds to the load detection step in the present invention. The load cell unit 2 transmits information about the detected load to the CPU 31 of the PC 3 (S103). The CPU 31 of the PC 3 calculates loads F2 and f2 based on the information about loads F1 and f1. Specifically, F2 is calculated by subtracting F1 from the subject's weight, and f2 is calculated by inverting f1. The position of the center of gravity is then calculated based on the information about loads F1, f1, F2, and f2, as well as H and D (S104). The load information is continuously transmitted to the CPU 31 over time, and the position of the center of gravity is also continuously calculated accordingly. Here, S104 corresponds to the center of gravity position calculation step in the present invention. The calculated position of the center of gravity is displayed on a two-dimensional coordinate plane, and the display 32 of the PC 3 displays the position of the center of gravity at the time of calculation by the CPU 31, along with a continuous movement trajectory of the position of the center of gravity over a predetermined period prior to that time (S105).

[0040] Furthermore, the simple visualization system 1 for human center of gravity position in Example 1 can be easily carried, and with the simple visualization system 1 for human center of gravity position, the position of the subject's center of gravity can be measured regardless of location, for example, on the floor.

[0041] Example 2 Next, a second embodiment of the present invention will be described. In this embodiment, an example will be described in which a camera for capturing an image of a subject is added as a component to the simple visualization system 1 for visualizing the position of the center of gravity of a human being in the first embodiment.

[0042] <Device configuration> FIG. 6 is a schematic diagram showing an example of a simple visualization system 10 for a human center of gravity position according to a second embodiment. The simple visualization system 10 for a human center of gravity position according to the second embodiment includes, as components, a load cell unit 20, a PC 30, an A / D board 40, and a camera 5. The camera 5 is connected to the PC 30 via the A / D board 40. The camera 5 captures an image of the subject when detecting a load, and the captured image data is transmitted to the A / D board 40 as an analog signal, and then converted into digital data and transmitted to the PC 30. The direction and angle of the camera 5 can be adjusted, and the direction and angle at which the image of the subject is captured can be freely changed. Note that, similar to the configuration of the simple visualization system 1 for a human center of gravity position according to the first embodiment, the connection between the camera 5 and the A / D board 40 may be wired or wireless. Furthermore, if the load cell unit 20 and the camera 5 are capable of outputting digital data, the A / D board 40 is not required as a component of the simple visualization system 10 for a human center of gravity position. Furthermore, if the PC 30 has a built-in camera and is capable of capturing an image of the subject, the visualization system 10 does not need to include the camera 5 as a component. Here, the camera 5 corresponds to the imaging device in the present invention.

[0043] Fig. 7 is an explanatory diagram showing a mode of detecting a load using the simplified system 10 for visualizing the position of the center of gravity of a person in Example 2. The mode of detecting a load shown in Fig. 7 is the same as the mode of detecting a load shown in Fig. 2 in Example 1, except that the state in which the subject is gripping the tip 210 of the load cell unit 20 is captured by the camera 5 and displayed as a moving image in real time on the display 320 of the PC 30. Note that there may be multiple cameras 5 so that the subject can be captured from various directions and angles.

[0044] <System configuration> FIG. 8 is an explanatory diagram showing an example of the calculation result of the position of the center of gravity displayed on the display 320 of the PC 30 in the simple visualization system 10 for the position of the center of gravity of a human being in the second embodiment. The display 320 of the PC 30 displays the position of the center of gravity of the subject and the load information acquired by the CPU 310 of the PC 30, as in FIG. 4 in the first embodiment, and further displays a moving image captured by the camera 5 in real time on another screen. The two-dimensional coordinates indicating the position of the center of gravity of the subject can be displayed superimposed on the subject in the moving image. This makes it possible to visualize the position of the center of gravity of the subject in the same way as in the first embodiment. Compared to when no moving image is displayed, the position of the subject's center of gravity is visualized more clearly, and the subject can more easily grasp the position of the center of gravity. Furthermore, if a smartphone is used instead of the camera 5, in addition to capturing an image of the subject, it is possible to execute the calculations required to calculate the position of the subject's center of gravity on the smartphone, display moving images, and record data related to the position of the center of gravity, thereby eliminating the need for the PC 30 as a component of the simplified human center of gravity position visualization system 10, and further simplifying the system.

[0045] In the method for easily visualizing the position of the center of gravity of a human being using the system 10 for easily visualizing the position of the center of gravity of a human being in the second embodiment, the method for calculating the position of the center of gravity of the human being is the same as that shown in FIG. 3 of the first embodiment. Also, the flow from inputting parameters that are the basis of the load information to displaying the calculated position of the center of gravity is the same as that shown in FIG. 5 of the first embodiment. In the second embodiment, the step of capturing an image of the state in which the subject is gripping the tip end 210 of the load cell unit 20 by the camera 5 is included in S102, and the step of displaying the moving image captured by the camera 5 on the display 320 of the PC 30 in real time is included in S105. [Explanation of symbols]

[0046] 1, 10: Simple visualization system for human center of gravity 2, 20: Load cell section 21, 210: Tip 22, 220: Sensor section 22a, 220a: First load cell 22b, 220b: Second load cell 3, 30: PC 31, 310: CPU 32, 320: Display 4, 40: A / D board 5: Camera

Claims

1. A simple visualization system for human center of gravity position that calculates the position of the center of gravity in the body of a subject and visualizes the position of the center of gravity, a load detector having a tip portion that the subject holds with any of the limbs or on which the subject places any of the limbs, and a sensor portion that detects a load acting on the tip portion; a calculation unit that calculates the position of the center of gravity based on information about the load detected by the sensor unit of the load detector; a display unit that displays the position of the center of gravity calculated by the calculation unit; Equipped with the calculation unit dynamically calculates the position of the center of gravity based on the load detected by the sensor unit of the load detector and a second load generated at a body weight application point where the subject applies their weight to a floor surface other than the tip end, The calculation unit further calculates the position of the center of gravity at the tip based on the height from the floor of a contact position where the subject grasps with one of their limbs or places one of their limbs, the horizontal distance between the contact position and the point of application of their body weight, and the body weight of the subject.

2. 2. The simplified visualization system for the position of the center of gravity of a human being as described in claim 1, wherein the tip of the load detector has a predetermined low-moment shape that is unlikely to generate a rotational moment when the subject grasps it with any of their limbs or places any of their limbs on it.

3. 3. The system for easily visualizing the position of the center of gravity of a human being according to claim 2, wherein the low moment shape is a plate-like shape extending in a vertical direction.

4. 4. The simplified visualization system for the position of the center of gravity of a person according to claim 1, wherein the display unit further displays a continuous movement trajectory of the position of the center of gravity prior to the point in time when the position of the center of gravity is calculated by the calculation unit.

5. further comprising an imager for capturing an image of the subject; The simplified visualization system for the position of the center of gravity of a person according to any one of claims 1 to 3, characterized in that the display unit displays a moving image of the subject captured by the imaging device, and superimposes on the moving image the position of the center of gravity calculated by the calculation unit and / or a continuous movement trajectory of the position of the center of gravity prior to the point in time calculated by the calculation unit.

6. A method for visualizing a human center of gravity position, which calculates a position of a center of gravity in a body of a subject and visualizes the position of the center of gravity, comprising: An input step in which parameters that form the basis of load information are input in advance; a load detection step in which the subject grasps a tip portion of a load detector capable of detecting loads in a vertical direction and a horizontal direction with any of the limbs or places any of the limbs on the tip portion to detect the load; a center-of-gravity position calculation step of calculating the position of the center of gravity based on information about the load detected in the load detection step; a center of gravity position visualization step of displaying the position of the center of gravity calculated in the center of gravity position calculation step; and In the center-of-gravity position calculation step, a position of the center of gravity is dynamically calculated based on the load detected in the load detection step and a second load generated at a body weight application point where the subject applies their weight to a floor surface other than the tip end portion, a step of calculating the center of gravity position by calculating the position of the center of gravity based on the height of the contact position from the floor at the tip end where the subject grasps the object with one of their limbs or places one of their limbs, the horizontal distance between the contact position and the point of application of the body weight, and the body weight of the subject.

7. 7. The method for simply visualizing the position of the center of gravity of a human being according to claim 6, wherein in the center of gravity position calculation step, the position of the center of gravity is calculated while ignoring a rotational moment generated at the tip end portion that can be detected in the load detection step.

8. In the center-of-gravity position calculation step, the contact position and the body weight application point are defined as two points supporting the body of the test subject, a resultant force of the load generated in the vertical direction and the load generated in the horizontal direction at the contact position is defined as a first load vector, and a resultant force of the second load generated in the vertical direction and the second load generated in the horizontal direction at the body weight application point is defined as a second load vector, 8. The method for simply visualizing the position of the center of gravity of a human being according to claim 6, wherein the intersection of the first load vector and the second load vector is set as the position of the center of gravity.

9. 9. The method for simply visualizing the position of the center of gravity of a person according to claim 6, wherein the center of gravity position visualization step further displays a continuous movement trajectory of the position of the center of gravity before the position of the center of gravity is calculated in the center of gravity position calculation step.

10. 9. A simplified method for visualizing the position of the center of gravity of a human being according to claim 6, wherein in the center of gravity position visualization step, the subject imaged in the load detection step is displayed as a moving image, and the position of the center of gravity calculated in the center of gravity position calculation step and / or a continuous movement trajectory of the position of the center of gravity prior to the time calculated in the center of gravity position calculation step are displayed superimposed on the moving image.

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