Impact response test system and test method for unexpected falling of human body

Abstract

The invention relates to the field of human body reaction capability testing and evaluation. An impact response testing system for unexpected falling of a human body comprises a surface myoelectricity tester, a three-dimensional infrared motion capturing system, a three-dimensional force measuring table, a plantar pressure insole and a falling testing frame. The drop test frame is arranged above the three-dimensional force test table and comprises a test frame, a turnover standing platform and an electromagnetic control system, the turnover standing platform is arranged on the test frame, and the electromagnetic control system controls the turnover standing platform to be horizontal or turnover; a to-be-tested person is provided with a myoelectricity sensor and a test mark, wears a test shoe provided with a plantar pressure insole and stands on the turnover standing platform of the drop test frame, the electromagnetic control system controls the turnover time of the turnover standing platform, after turnover, the three-dimensional force test table tests the space and the stress of the human body, and the test result is obtained. All the instruments send data to the central computer, and test result analysis is conducted on the data of all parts of the body of the to-be-tested person.

Description

Technical Field

[0001] The present invention relates to the field of human body reaction ability testing and evaluation, and in particular to a human body unexpected fall impact reaction testing system and testing method. Background Art

[0002] In ball sports such as basketball and volleyball, athletes often jump into the air and then land or land and then jump again. When both feet land, the peak impact force is three to seven times the body weight. There is a close relationship between this high impact force and lower limb injuries during high-intensity landing, indicating that excessive repetitive loads can induce acute injuries. The process of landing and then jumping again is essentially a process of quickly transforming from eccentric action to concentric action. This ability demonstrated by athletes is called reactive jumping ability, which is closely related to the athlete's sports performance and the evaluation of returning to the game after injury.

[0003] At present, the common evaluation method in the industry is that the athlete actively falls from a platform of a specific height. The subject stands on a platform of a fixed height (usually 30-50cm), then extends one foot and steps forward, causing the body to lean forward and fall. When the body initially touches the ground, it actively controls each section to weaken the impact force and dissipate kinetic energy, and a force platform is used to measure impact force-related parameters.

[0004] However, current drop tests all involve spontaneous landings under expected circumstances, safe or successful landings after falls, such as drop jumps or drop landings, with the body actively controlling each segment at the initial touchdown to reduce impact forces and dissipate kinetic energy. This process is mainly achieved by changing the mechanics of the lower limbs, such as increasing knee flexion to reduce potential damage to the anterior cruciate ligament, or bringing the leg stiffness to an ideal range to reduce impact forces, thereby avoiding bone injuries such as knee osteoarthritis and stress fractures. These biomechanical changes in the above drop tasks are all controlled by expected motion control patterns and cannot simulate the random processes of the field.

[0005] However, in sports, lower limb injuries such as ankle sprains and anterior cruciate ligament tears are likely to occur in certain unexpected situations, when the available reaction time is shorter than the individual's reaction time, and the human body's movement strategy cannot be fully prepared before landing, and there is not enough time to prepare for the impact of landing. Logically, expected and unexpected falls have different movement control strategy patterns, which may induce various musculoskeletal injuries, but the characteristics of lower limb impact, soft tissue vibration, posture control and reaction ability of the human body in unexpected falls are not yet understood, and there is no relevant system equipment or method for accurate observation and data testing. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a human body unexpected fall impact reaction testing system and testing method to solve the technical problem that there is currently no effective method to observe and understand the athlete's lower limb impact, soft tissue vibration, posture control and other reactions when falling unexpectedly.

[0007] Technical Solution

[0008] The impact reaction test system of unexpected human fall is characterized by comprising a surface electromyography tester for testing the force and reaction of human muscles, a three-dimensional infrared motion capture system for testing the posture control of the human body in the case of unexpected fall, a three-dimensional force measuring platform for testing the force conditions in various directions in space, and a plantar pressure insole for testing the distribution and force conditions of the plantar pressure of the human body, and a fall test frame;

[0009] The drop test frame is arranged above the three-dimensional force platform and within the capture space of the three-dimensional infrared motion capture system, and comprises a test frame, a reversible standing platform and an electromagnetic control system. The test frame is arranged above the force platform plane of the three-dimensional force platform, the reversible standing platform is arranged on the test frame, and the electromagnetic control system controls the horizontal or reversal of the reversible standing platform.

[0010] The person to be tested is equipped with electromyographic sensors, test marks, and test shoes equipped with plantar pressure insoles, and stands on the reversible standing platform of the drop test frame. The electromagnetic control system controls the reversal time of the reversible standing platform. After the reversal, the electromyographic sensors send data on the muscle force and reaction of the person to be tested to the surface electromyography tester, the three-dimensional infrared motion capture system captures the test marks on the person to be tested, the test shoes feed back the pressure data distribution of the plantar pressure shoes, the three-dimensional force platform tests the space and the force of the human body, and then all instruments send data to the central computer to analyze the test results of the data of various parts of the body of the person to be tested.

[0011] Furthermore, the long side of the reversible standing platform is connected to the front cross bar of the frame through a high-strength spring hinge. The electromagnetic control system includes a magnetic controller, an iron block, a power controller and a reset switch. The magnetic controller is installed below the connecting rods on both sides of the frame. The iron blocks are installed on the short sides of the reversible standing platform. When the magnetic controller attracts the iron block, the reversible standing platform is in a horizontal state. When the magnetic controller repels the iron block, the reversible standing platform is driven by the iron block to accelerate the reversal, and the side not connected to the frame falls rapidly. The power controller and the reset switch control the on and off of the magnetic controller to control the horizontal or reversal of the reversible standing platform.

[0012] Furthermore, the reset switch has a serial port connected to the host computer. The reset switch is used to control the power switch through the power controller to realize the opening and closing of the magnetic controller and the iron block, thereby realizing the downward flipping of the flippable standing platform on the frame; at the same time, the host computer randomly controls the opening and closing time of the reset switch through the control software.

[0013] Furthermore, the frame includes four sides, which are in a semi-box shape and surround the flippable standing platform to provide necessary support and height support for it; the three-dimensional force platform is arranged in the space left by the frame part on the bottom surface of the frame to facilitate the test.

[0014] A method for testing the impact reaction of a human body caused by an unexpected fall using the above-mentioned impact reaction testing system is characterized by comprising the following steps:

[0015] Step 1: calibrate the electromyographic sensor and the test mark, and then stick the calibrated electromyographic sensor and the test mark on the body muscle observation points or key body position observation points of the person to be tested;

[0016] Step 2: The tester walks onto the reversible standing platform and adjusts his standing posture according to the test requirements;

[0017] Step 3: After the tester is ready, the tester randomly presses the reset switch to release the flip stand platform, or the tester randomly controls the reset switch through the control software of the host computer to release the flip stand platform;

[0018] Step 4: After the test person falls onto the three-dimensional force measuring platform and remains stable after landing, test-related data and images are obtained; or after the test person falls onto the three-dimensional force measuring platform and immediately jumps up and remains stable after landing, test-related data and images are obtained.

[0019] Furthermore, in step 1, myoelectric sensors are arranged at the protruding positions of the main muscles of the upper and lower limbs of the person to be tested, so as to collect the muscle electrical signals of the human body during exercise.

[0020] In step 1, the test marker is used for a three-dimensional infrared motion capture system and is set at the joint or movement change tracking point of the upper or lower limbs to be monitored, as well as the foot tracking point.

[0021] Furthermore, after step 4, the impact, muscle reaction and posture control ability of the testee in an unexpected fall are evaluated by combining multiple test results of two test methods for the testee, namely, keeping stable after landing and jumping up immediately after landing and then keeping stable, which are manually tested by the tester or automatically tested by the controller.

[0022] Beneficial Effects

[0023] The present invention adopts a random drop platform, cooperates with an electromyography tester, an infrared motion capture system, a force platform and a plantar pressure insole, thereby reducing the predictability of a human drop test and the level of muscle activation before the fall, and can more accurately observe the subject's reaction, evaluate the subject's joint stress and motion control ability, and through the design of different test methods, can observe the subject's reaction in different situations to find possible improvements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic three-dimensional structural diagram of the drop test stand of the present invention, wherein the flippable standing platform is in a horizontal position.

[0025] Figure 2 It is a schematic structural stereoscopic diagram of the drop test stand of the present invention, wherein the flippable standing platform is in a flipped vertical position.

[0026] Figure 3 It is a side view schematic diagram of the drop test stand of the present invention, the left side shows the flip stand platform in a horizontal position, and the right side shows the flip stand platform in a vertical position.

[0027] Figure 4 This is the circuit diagram of the electromagnetic control system, in which the electromagnetic control system is working and the green indicator light is on.

[0028] Figure 5 This is the circuit diagram of the electromagnetic control system, in which the electromagnetic control system fails and the red indicator light is on.

[0029] Figure 6 The figure is a schematic diagram of the test process.

[0030] Figure 7 Schematic diagram of the positioning and pasting positions of the electromyographic sensors on the upper limbs.

[0031] Figure 8 Schematic diagram of the positioning and pasting positions of the electromyographic sensors in the lower limbs.

[0032] Among them: 1-frame, 2-reversible standing platform, 3-high-strength spring hinge, 4-electromagnetic control system, 401-magnetic controller, 402-iron block, 403-power controller, 404-reset switch. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with specific embodiments and drawings.

[0034] In order to understand the characteristics of lower limb impact, soft tissue vibration, posture control and reaction ability when a person falls unexpectedly, the present invention proposes a human body unexpected fall impact reaction test system and test method, thereby performing accurate observation and data testing, and on this basis, evaluating the corresponding ability.

[0035] The impact reaction test system for unexpected human falls includes a surface electromyography tester for testing human muscle stress and reaction conditions, a three-dimensional infrared motion capture system for testing human posture control conditions in unexpected falls, a three-dimensional force platform for testing stress conditions in various directions in space, and a plantar pressure insole for testing the distribution and stress conditions of plantar pressure on the human body, and a drop test stand;

[0036] The drop test frame is arranged above the three-dimensional force platform and within the capture space of the three-dimensional infrared motion capture system, and comprises a test frame, a reversible standing platform and an electromagnetic control system. The test frame is arranged above the force platform plane of the three-dimensional force platform, the reversible standing platform is arranged on the test frame, and the electromagnetic control system controls the horizontal or reversal of the reversible standing platform.

[0037] The person to be tested is equipped with electromyographic sensors, test marks, and test shoes equipped with plantar pressure insoles, and stands on the reversible standing platform of the drop test frame. The electromagnetic control system controls the reversal time of the reversible standing platform. After the reversal, the electromyographic sensors send data on the muscle force and reaction of the person to be tested to the surface electromyography tester, the three-dimensional infrared motion capture system captures the test marks on the person to be tested, the test shoes feed back the pressure data distribution of the plantar pressure shoes, the three-dimensional force platform tests the space and the force of the human body, and then all instruments send data to the central computer to analyze the test results of the data of various parts of the body of the person to be tested.

[0038] The present invention adopts a random drop platform, cooperates with an electromyography tester, an infrared motion capture system, a force platform and a plantar pressure insole, thereby reducing the predictability of a human drop test, reducing the level of muscle activation before the fall, and being able to more accurately observe the reaction of the subject.

[0039] like Figure 1 to Figure 3 As shown, the long side of the reversible standing platform is connected to the front cross bar of the frame through a high-strength spring hinge, the electromagnetic control system includes a magnetic controller, an iron block, a power controller and a reset switch, the magnetic controller is installed under the connecting rods on both sides of the frame, and the iron block is installed on the short side of the reversible standing platform. When the magnetic controller attracts the iron block, the reversible standing platform is in a horizontal state. When the magnetic controller repels the iron block, the reversible standing platform is driven by the iron block to accelerate the reversal, and the side not connected to the frame falls rapidly. The power controller and the reset switch control the on and off of the magnetic controller to control the horizontal or reversal of the reversible standing platform.

[0040] The reset switch has a serial port connected to the host computer. The reset switch is used to control the power switch through the power controller to realize the opening and closing of the magnetic controller and the iron block, thereby realizing the downward flipping of the flippable standing platform on the frame; at the same time, the host computer randomly controls the opening and closing time of the reset switch through the control software.

[0041] The frame 1 includes four sides, a front side, two side sides and a bottom side, and is in a semi-box shape, surrounding the flippable standing platform 2 to provide necessary support and height support for it; the empty space on the bottom frame part of the frame 1 can accommodate a force platform, providing convenience for testing.

[0042] The footrest part of the reversible standing platform 2 is 300 mm wide, which can ensure that the subject can make a normal preparation posture without restriction; the reversible standing platform 2 is 320 mm from the bottom (after deducting the height of the force platform), which meets the platform height of a general drop jump test.

[0043] The high-strength spring hinge 3 is fixed to the frame 1 and the reversible standing platform 2 by screws, providing necessary elastic force for the reversible standing platform 2 to flip, so that the reversible standing platform 2 flipping and falling speed is greater than the free falling speed of the subject, so that the subject does not fall unexpectedly.

[0044] The electromagnetic control system 4 includes a magnetic force controller 401, an iron block 402, a power controller 403, and a reset switch 404, wherein the magnetic force controller 401 and the iron block 402 are magnetic parts; the magnetic controller 401 is installed on the two side frames of the frame 1 by screws, and the iron block 402 is fixed on the flip standing platform 2 by screws, the power controller 403 is placed on the column of the frame 1, and the reset switch 404 is placed next to the frame 1, and the reset switch 404 has a serial port connected to the host computer; Figure 3 As shown, the reset switch 404 is used to control the switch of the power supply through the power controller 403, so as to realize the opening and closing of the magnetic controller 401 and the iron block 402, thereby realizing the downward flipping of the flippable standing platform 2 on the frame 1; at the same time, the control software written by the host computer can realize the random control of the opening and closing time of the reset switch 404; the circuit diagram of the electromagnetic control system 4 is shown in Figure 4 , 5 As shown, the input voltage of the power controller 403 is 220V, the output voltage is 12V, the current is 5A, and the magnetic part can withstand a tensile force of ±2000N; when the reset switch is closed, the drop platform is also closed horizontally (such as Figure 1 ), the electromagnetic control system 4 works and the green indicator light is on; when the reset switch is pressed, the electromagnetic control system 4 fails, the standing platform 2 can be flipped down, and the red indicator light is on.

[0045] Attached Figure 6 The test method flow of the present invention mainly adopts the following steps:

[0046] Step 1: calibrate the electromyographic sensor and the test mark, and then stick the calibrated electromyographic sensor and the test mark on the body muscle observation points or key body position observation points of the person to be tested;

[0047] Step 2: The tester walks onto the reversible standing platform and adjusts his standing posture according to the test requirements;

[0048] Step 3: After the tester is ready, the tester randomly presses the reset switch to release the flip stand platform, or the tester randomly controls the reset switch through the control software of the host computer to release the flip stand platform;

[0049] Step 4: After the test person falls onto the three-dimensional force measuring platform and remains stable after landing, test-related data and images are obtained; or after the test person falls onto the three-dimensional force measuring platform and immediately jumps up and remains stable after landing, test-related data and images are obtained.

[0050] The present invention can realize the drop jump test of the subject without expectation. Compared with the general drop jump test, the falling mode of the subject changes from active jumping to passive falling. The test requires the subject to stand on the platform and wait for the test. The surrounding environment can simulate the game scenes of basketball, rugby, volleyball, etc., or conduct some multi-target tests. During the test or game scene, the tester manually presses the control switch, or clicks the random control switch program written on the computer to control the reset switch. After the electromagnetic controller fails, the platform flips 90° and the subject falls. The tester only needs to use the reset switch control or control the reset switch through software to achieve the effect of no expected fall, which is easy to operate.

[0051] Myoelectric sensors can be set at the protruding positions of the main muscles of the upper and lower limbs of the person to be tested to collect muscle electrical signals when the human body is exercising.

[0052] The following table is Example 1 of the electromyographic paste solution:

[0053]

[0054] This implementation scheme focuses on the muscle electrical signals of the upper and lower limbs at the same time to observe the muscle force and reaction.

[0055] The test markers are used in a 3D infrared motion capture system and are set at the joint or motion change tracking points of the upper or lower limbs to be monitored, as well as the foot tracking points.

[0056] The following table shows Example 1 of the solution for pasting reflective marker balls as test markers:

[0057]

[0058] This marking embodiment mainly observes the spatial displacement of the marking points of the lower limbs when the human body moves, thereby observing the movement trajectory and reaction of the human body.

[0059] After each test, the surface electromyography tester, three-dimensional infrared motion capture system, three-dimensional force platform, and plantar pressure insole that obtain data and images will transmit the data and images to the host computer or central computer for data analysis.

[0060] After two tests on the test persons manually or automatically tested by the controller, namely, keeping stability after landing and jumping up immediately after landing and then keeping stability, multiple test results were obtained. The testers were able to comprehensively evaluate the impact, muscle reaction and posture control ability of the test persons in unexpected falls, and could observe changes in reaction ability under different times and different action requirements, which played a positive role in further research on improving reaction ability.

[0061] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A human body unexpected fall impact reaction test system, characterized in that: It includes a surface electromyography tester for testing the force and reaction of human muscles, a three-dimensional infrared motion capture system for testing the posture control of the human body in the event of an unexpected fall, a three-dimensional force platform for testing the force in various directions in space, and a plantar pressure insole for testing the distribution and force of plantar pressure on the human body, and a drop test stand; The drop test frame is arranged above the three-dimensional force platform and within the capture space of the three-dimensional infrared motion capture system, and comprises a test frame, a reversible standing platform and an electromagnetic control system. The test frame is arranged above the force platform plane of the three-dimensional force platform, the reversible standing platform is arranged on the test frame, and the electromagnetic control system controls the horizontal or reversal of the reversible standing platform. The person to be tested is equipped with electromyographic sensors, test marks, and test shoes equipped with plantar pressure insoles, and stands on the reversible standing platform of the drop test frame. The electromagnetic control system controls the reversal time of the reversible standing platform. After the reversal, the electromyographic sensors send data on the muscle force and reaction of the person to be tested to the surface electromyography tester, the three-dimensional infrared motion capture system captures the test marks on the person to be tested, the test shoes feed back the pressure data distribution of the plantar pressure shoes, the three-dimensional force platform tests the space and the force of the human body, and then all instruments send data to the central computer to analyze the test results of the data of various parts of the body of the person to be tested.

2. The impact reaction testing system according to claim 1, characterized in that: The long side of the reversible standing platform is connected to the front cross bar of the frame through a high-strength spring hinge. The electromagnetic control system includes a magnetic controller, an iron block, a power controller and a reset switch. The magnetic controller is installed below the connecting rods on both sides of the frame. The iron blocks are installed on the short sides of the reversible standing platform. When the magnetic controller attracts the iron block, the reversible standing platform is in a horizontal state. When the magnetic controller repels the iron block, the reversible standing platform is driven by the iron block to accelerate the reversal, and the side not connected to the frame falls rapidly. The power controller and the reset switch control the on and off of the magnetic controller to control the horizontal or reversal of the reversible standing platform.

3. The impact reaction testing system according to claim 2, characterized in that: The reset switch has a serial port connected to the host computer, and the reset switch is used to control the power switch through the power controller to realize the opening and closing of the magnetic controller and the iron block, thereby realizing the downward flipping of the flippable standing platform on the frame; At the same time, the host computer randomly controls the opening and closing time of the reset switch through the control software.

4. The impact reaction testing system according to claim 1, wherein: The frame includes four sides, forming a semi-box shape to surround the flippable standing platform, providing necessary support and height support for it; the three-dimensional force platform is arranged in the space left empty by the frame part on the bottom surface of the frame, providing convenience for testing.

5. A method for testing the impact reaction of a human body caused by an unexpected fall using the impact reaction testing system as claimed in claim 1, characterized in that: The steps include: Step 1: calibrate the electromyographic sensor and the test mark, and then stick the calibrated electromyographic sensor and the test mark on the body muscle observation points or key body position observation points of the person to be tested; Step 2: The tester walks onto the reversible standing platform and adjusts his standing posture according to the test requirements; Step 3: After the tester is ready, the tester randomly presses the reset switch to release the flip stand platform, or the tester randomly controls the reset switch through the control software of the host computer to release the flip stand platform; Step 4: After the test person falls onto the three-dimensional force measuring platform and remains stable after landing, test-related data and images are obtained; or after the test person falls onto the three-dimensional force measuring platform and immediately jumps up and remains stable after landing, test-related data and images are obtained.

6. The method for testing impact response according to claim 5, characterized in that: In the step 1, myoelectric sensors are arranged at the protruding positions of the main muscles of the upper and lower limbs of the person to be tested, so as to collect the muscle electrical signals of the human body during exercise.

7. The method for testing impact response according to claim 5, characterized in that: In step 1, the test marker is used for a three-dimensional infrared motion capture system and is set at the joint or movement change tracking point of the upper or lower limbs to be monitored, as well as the foot tracking point.

8. The method for testing impact response according to claim 5, wherein: After step 4, the impact, muscle reaction and posture control ability of the testee in the event of an unexpected fall are evaluated by combining multiple test results of two test methods, namely, maintaining stability after landing and jumping up immediately after landing and then maintaining stability, which are manually tested by the tester or automatically tested by the controller.

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