CN114404919A - Evaluation method and terminal for straight road middle running body - Google Patents
Evaluation method and terminal for straight road middle running body Download PDFInfo
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Abstract
The invention discloses an evaluation method and a terminal for a straight road middle running trunk, wherein the trunk and both sides of the head, the parts of the trunk connected with four limbs and the tail bones of the spine of a subject are marked, so that the trunk movement is simplified; the method comprises the steps of performing motion capture and pressure test on a testee running on a straight road on the basis of the identification of the testee, wherein the motion track of the identification of the spine coccyx is matched with the motion track of the mass center of a human body captured by the motion, and correcting delay data of the pressure test, so that the problem of delay of the pressure test data in the prior art can be solved; and establishing a virtual rotation point of the body coordinate corresponding to the testee through data acquired by motion capture and pressure test, and evaluating the trunk stability according to the virtual rotation point, thereby realizing the evaluation of the trunk stability of the straight road running in the middle.
Description
Technical Field
The invention relates to the technical field of biological simulation, in particular to an evaluation method and a terminal for a straight road middle running trunk.
Background
It is known that, during running, not only the lower extremities, by swinging, can obtain a rebound between the foot and the support surface, but also the upper extremities, by swinging, can obtain a rebound of the foot and support surface, the swinging of the extremities being spread around the trunk. Thus, the primary function of the torso is stabilization. In the evaluation of human body static stability, the center of pressure (COP) index is the gold standard; in the dynamic stability evaluation, it is also an essential method to read the stability based on the "butterfly diagram" constituted by COP. For reference, COP of static stability analysis and dynamic stability analysis are calculated, and therefore, stability analysis of the trunk is also evaluated by using a similar parameter, namely a Virtual Turning Point (VTP).
VTP can be calculated by two methods, one is a forward kinetic method and the other is a reverse kinetic method. How to combine a forward dynamics calculation method with a reverse dynamics method to realize the evaluation of the trunk stability of straight-road middle-run is a technical problem to be solved urgently.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method and the terminal for evaluating the trunk of the straight road running in the middle way can evaluate the trunk stability of the straight road running in the middle way.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for evaluating a trunk running in a straight road comprises the following steps:
marking the trunk and the two sides of the head, the parts of the trunk connected with the four limbs and the coccyx of the spine of the subject;
performing motion capture and pressure test on a subject running on a straight road on the basis of the identification of the subject, matching the motion track of the identification of the spine coccyx with the motion track of the mass center of the human body captured by the motion, and correcting delay data of the pressure test;
and establishing a virtual rotation point of the body coordinate corresponding to the subject through the data acquired by the motion capture and the pressure test, and evaluating the trunk stability according to the virtual rotation point.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
an evaluation terminal for a trunk running in a straight road comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the following steps:
marking the trunk and the two sides of the head, the parts of the trunk connected with the four limbs and the coccyx of the spine of the subject;
performing motion capture and pressure test on a subject running on a straight road on the basis of the identification of the subject, matching the motion track of the identification of the spine coccyx with the motion track of the mass center of the human body captured by the motion, and correcting delay data of the pressure test;
and establishing a virtual rotation point of the body coordinate corresponding to the subject through the data acquired by the motion capture and the pressure test, and evaluating the trunk stability according to the virtual rotation point.
The invention has the beneficial effects that: the trunk and the two sides of the head, the parts of the trunk connected with the four limbs and the coccyx of the spine of the subject are marked, so that the trunk movement is simplified; the method comprises the steps of performing motion capture and pressure test on a testee running on a straight road on the basis of the identification of the testee, wherein the motion track of the identification of the spine coccyx is matched with the motion track of the mass center of a human body captured by the motion, and correcting delay data of the pressure test, so that the problem of delay of the pressure test data in the prior art can be solved; and establishing a virtual rotation point of the body coordinate corresponding to the testee through data acquired by motion capture and pressure test, and evaluating the trunk stability according to the virtual rotation point, thereby realizing the evaluation of the trunk stability of the straight road running in the middle.
Drawings
FIG. 1 is a flow chart illustrating steps of a method for evaluating a running trunk on a straight road in an embodiment of the invention;
fig. 2 is a schematic structural diagram of an evaluation terminal for a trunk running in a straight road in the embodiment of the invention;
FIG. 3 is a schematic illustration of the delay of a stress test when the motion capture system is running concurrently with the stress test system;
FIG. 4 is a VTP diagram of six body coordinates in one swing arm cycle of a subject;
FIG. 5 is a pressure diagram of sole of a subject in the voluntary landing mode in example two;
FIG. 6 is a plantar pressure map of the lateral arch pattern of the subjects of example two;
FIG. 7 is a pressure profile of the subject of the second example;
FIG. 8 is a 12 second individual foot pressure plot for the subject of example two;
FIG. 9 is a gait parameter map of a subject in the second embodiment;
FIG. 10 is a graph of analysis of the center of pressure of the subject in the second example;
FIG. 11 is a graph of force and pressure for the subject of example two;
FIG. 12 is a schematic representation of the forward dynamics of 7 elite sprinters in the second example at a pace of 3 m;
FIG. 13 is a schematic representation of the forward dynamics of autonomous landing of a subject according to example two;
FIG. 14 is a graph showing the forward kinetics of the subject at a pace frequency of 155 steps/min in example two;
FIG. 15 is a graph showing the forward kinetics of the subject in example two in a lateral arcade manner at a step frequency of 155 steps/min;
fig. 16 is a graph showing a change of x-axis values of the body coordinate system in the autonomous landing mode, taking the elbow joint as an example in the second embodiment;
fig. 17 is a graph showing a change in the y-axis value of the body coordinate system in the autonomous landing mode, using the elbow joint as an example in the second embodiment;
fig. 18 is a graph showing a change in z-axis value of the body coordinate system in the autonomous landing mode, using the elbow joint as an example in the second embodiment;
FIG. 19 is a graph showing the x-axis numerical values of the body coordinate system in the case of the outer arch ground mode, using the elbow joint as an example, according to the second embodiment;
FIG. 20 is a graph showing the change of the y-axis numerical values of the body coordinate system in the case of the outer-side bowing ground mode, using the elbow joint as an example in the second embodiment;
FIG. 21 is a graph showing a z-axis numerical value of a body coordinate system in a lateral bowing ground mode, using an elbow joint as an example, according to a second embodiment;
FIG. 22 is a model of the frame of the spot-stick in the second example;
description of reference numerals:
1. an evaluation terminal for a straight road running trunk in the middle of the straight road; 2. a memory; 3. a processor.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, fig. 3 and fig. 4, an embodiment of the present invention provides a method for evaluating a trunk of a straight road during running, including the steps of:
marking the trunk and the two sides of the head, the parts of the trunk connected with the four limbs and the coccyx of the spine of the subject;
performing motion capture and pressure test on a subject running on a straight road on the basis of the identification of the subject, matching the motion track of the identification of the spine coccyx with the motion track of the mass center of the human body captured by the motion, and correcting delay data of the pressure test;
and establishing a virtual rotation point of the body coordinate corresponding to the subject through the data acquired by the motion capture and the pressure test, and evaluating the trunk stability according to the virtual rotation point.
From the above description, the trunk and both sides of the head, the parts of the trunk connected with the four limbs and the coccyx of the spine of the subject are identified, so that the trunk movement is simplified; the method comprises the steps of performing motion capture and pressure test on a testee running on a straight road on the basis of the identification of the testee, wherein the motion track of the identification of the spine coccyx is matched with the motion track of the mass center of a human body captured by the motion, and correcting delay data of the pressure test, so that the problem of delay of the pressure test data in the prior art can be solved; and establishing a virtual rotation point of the body coordinate corresponding to the testee through data acquired by motion capture and pressure test, and evaluating the trunk stability according to the virtual rotation point, thereby realizing the evaluation of the trunk stability of the straight road running in the middle.
Further, the identification of the trunk and two sides of the head, the connection part of the trunk and four limbs and the tail bone of the spine of the subject comprises:
simplifying the motion structure associated with the trunk of the subject into a point rod structure comprising two ears, two shoulders, two hips and the trunk, and identifying the two sides of the head of the subject, the parts of the upper limbs and the trunk at the two sides, the parts of the lower limbs and the trunk at the two sides and the tail bones of the spine.
According to the description, double ears, double shoulders, double hips and the trunk are simplified into the point rod structure, and the moving parts related to the trunk are identified, so that the technical characteristic analysis of the trunk during running on a straight road is simplified into the stability problem of the rigid frame structure, and the subsequent evaluation of the trunk stability is facilitated.
Further, matching the motion trail of the identification of the spine coccyx with the motion trail of the human body mass center captured by the motion, and correcting the delay data of the stress test comprises:
matching the data of the stress test with the data of the motion capture by adopting forward dynamics based on the characteristic that the motion trail of the mark of the spine coccyx is consistent with the motion trail of the mass center of the human body;
and correcting the delay data of the pressure test according to the matching result.
According to the description, the forward dynamics is adopted, and the data matching is carried out on the characteristics that the motion trail based on the identification of the spine coccyx is consistent with the motion trail of the mass center of the human body, so that the reference test combining the motion capture system and the pressure test system can be realized without synchronization.
Further, establishing a virtual pivot point of the subject's corresponding body coordinates from the data collected by the motion capture and stress test comprises:
calculating the virtual rotation point of the bone marker body coordinate:
in the formula xi、yi、ziRespectively representing the coordinates, x, of the virtual rotation point with respect to an inertial reference systemo、yo、zoRespectively representing the origin of the body coordinates of the virtual rotation points, and n representing the number of acquisitions.
According to the description, the virtual rotation point of the body coordinate is calculated, so that the trunk stability can be conveniently evaluated based on the virtual rotation point.
Further, the evaluation of the trunk stability according to the virtual rotation point includes:
and transforming the position coordinates of the virtual rotation points:
x′i＝(xi-xo)，y′i＝(yi-yo)，z′i＝(zi-zo)；
in the formula xi、yi、ziRespectively representing the coordinates, x, of the virtual rotation point with respect to an inertial reference systemo、yo、zoEach representing a body coordinate origin, x 'of a virtual rotation point'i、y′i、z′iRespectively representing the transformed virtual rotation point coordinates;
calculating the mean square error of the transformed virtual rotation point coordinates:
in the formula xi、yi、ziRespectively representing the transformed virtual rotation point position coordinates, Dx、Dy、DzRespectively representing mean square deviations;
and obtaining an evaluation result of the trunk stability according to the mean square error obtained by calculation.
As can be seen from the above description, the position coordinates of the virtual rotation point are transformed, and the mean square error calculation is performed according to the transformed virtual rotation point coordinates, so that the stability is higher as the mean square error is smaller, and the evaluation result of the trunk stability can be obtained quickly.
Referring to fig. 2, an embodiment of the present invention provides an evaluation terminal for a trunk running on a straight road, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the following steps when executing the computer program:
marking the trunk and the two sides of the head, the parts of the trunk connected with the four limbs and the coccyx of the spine of the subject;
performing motion capture and pressure test on a subject running on a straight road on the basis of the identification of the subject, matching the motion track of the identification of the spine coccyx with the motion track of the mass center of the human body captured by the motion, and correcting delay data of the pressure test;
and establishing a virtual rotation point of the body coordinate corresponding to the subject through the data acquired by the motion capture and the pressure test, and evaluating the trunk stability according to the virtual rotation point.
According to the description, the trunk and the two sides of the head, the parts of the trunk connected with the four limbs and the coccyx of the spine of the subject are marked, so that the trunk movement is simplified; the method comprises the steps of performing motion capture and pressure test on a testee running on a straight road on the basis of the identification of the testee, wherein the motion track of the identification of the spine coccyx is matched with the motion track of the mass center of a human body captured by the motion, and correcting delay data of the pressure test, so that the problem of delay of the pressure test data in the prior art can be solved; and establishing a virtual rotation point of the body coordinate corresponding to the testee through data acquired by motion capture and pressure test, and evaluating the trunk stability according to the virtual rotation point, thereby realizing the evaluation of the trunk stability of the straight road running in the middle.
Further, the identification of the trunk and two sides of the head, the connection part of the trunk and four limbs and the tail bone of the spine of the subject comprises:
simplifying the motion structure associated with the trunk of the subject into a point rod structure comprising two ears, two shoulders, two hips and the trunk, and identifying the two sides of the head of the subject, the parts of the upper limbs and the trunk at the two sides, the parts of the lower limbs and the trunk at the two sides and the tail bones of the spine.
According to the description, double ears, double shoulders, double hips and the trunk are simplified into the point rod structure, and the moving parts related to the trunk are identified, so that the technical characteristic analysis of the trunk during running on a straight road is simplified into the stability problem of the rigid frame structure, and the subsequent evaluation of the trunk stability is facilitated.
Further, matching the motion trail of the identification of the spine coccyx with the motion trail of the human body mass center captured by the motion, and correcting the delay data of the stress test comprises:
matching the data of the stress test with the data of the motion capture by adopting forward dynamics based on the characteristic that the motion trail of the mark of the spine coccyx is consistent with the motion trail of the mass center of the human body;
and correcting the delay data of the pressure test according to the matching result.
According to the description, the forward dynamics is adopted, and the data matching is carried out on the characteristics that the motion trail based on the identification of the spine coccyx is consistent with the motion trail of the mass center of the human body, so that the reference test combining the motion capture system and the pressure test system can be realized without synchronization.
Further, establishing a virtual pivot point of the subject's corresponding body coordinates from the data collected by the motion capture and stress test comprises:
calculating the virtual rotation point of the bone marker body coordinate:
in the formula xi、yi、ziRespectively representing the coordinates, x, of the virtual rotation point with respect to an inertial reference systemo、yo、zoRespectively representing the origin of the body coordinates of the virtual rotation points, and n representing the number of acquisitions.
According to the description, the virtual rotation point of the body coordinate is calculated, so that the trunk stability can be conveniently evaluated based on the virtual rotation point.
Further, the evaluation of the trunk stability according to the virtual rotation point includes:
and transforming the position coordinates of the virtual rotation points:
x′i＝(xi-xo)，y′i＝(yi-yo)，z′i＝(zi-zo)；
in the formula xi、yi、ziRespectively representing the coordinates, x, of the virtual rotation point with respect to an inertial reference systemo、yo、zoEach representing a body coordinate origin, x 'of a virtual rotation point'i、y′i、z′iRespectively representing the transformed virtual rotation point coordinates;
calculating the mean square error of the transformed virtual rotation point coordinates:
in the formula xi、yi、ziRespectively representing the transformed virtual rotation point position coordinates, Dx、Dy、DzRespectively representing mean square deviations;
and obtaining an evaluation result of the trunk stability according to the mean square error obtained by calculation.
As can be seen from the above description, the position coordinates of the virtual rotation point are transformed, and the mean square error calculation is performed according to the transformed virtual rotation point coordinates, so that the stability is higher as the mean square error is smaller, and the evaluation result of the trunk stability can be obtained quickly.
The method and the terminal for evaluating the trunk running in the straight road are suitable for the professional motor skill learning and control of sports human science, motor training, sports education and the like in the field of sports science; gait analysis and control in the fields of biomechanics in the field of biomedical engineering and motor rehabilitation engineering; and gait analysis and control of exercise prescription design in the fields of exercise rehabilitation and exercise medicine in the medical field. The stability of the trunk running in the straight road can be quantitatively evaluated. The following is described by way of specific embodiments:
example one
Referring to fig. 1, fig. 3 and fig. 4, a method for evaluating a trunk running on a straight road includes the steps of:
s1, identifying the parts of the trunk and the two sides of the head, the parts of the trunk and the four limbs of the subject and the coccyx of the spine.
Specifically, the technical characteristics of the straight road during running of the trunk are as follows: the head and the limbs of the human body are connected with the trunk through joints to form an unclosed multi-rigid-body chain system structure, which means that the motion system of the human body is a complex system. For analysis of complex systems, the function of the system should focus on the interactions between individuals.
Therefore, it is necessary to analyze the human motion process of the straight-track mid-track running technology and establish the kinematics and dynamics equations of the trunk. Firstly, simplifying the structures of the trunk and the head, and neglecting the movement of limbs; then, ears, shoulders, hips and torso are simplified into a point-rod structure. Therefore, the technical characteristic analysis of the trunk during running in the straight road is simplified into the stability problem of the rigid frame structure.
In this embodiment, identification points are attached to the bilateral sides of the head of the subject, the depression between the sternoclavicular joints on the two sides and the greater trochanter of the femur, respectively, according to human bony landmarks (bony landworks), and one identification point is attached to the coccyx of the spine of the subject.
S2, performing motion capture and pressure test on the subject running on the straight road based on the identification of the subject, matching the motion trail of the identification of the spine coccyx with the motion trail of the human body mass center captured by the motion, and correcting delay data of the pressure test.
In particular, it is common for motion capture systems to be combined with force-measuring table systems to collect human motion data. The technical characteristic is that the motion capture system and the force measuring platform system are both in the front end of A/D conversion, the computer receives the processed data, the time delay is generally in several milliseconds, and therefore the two sets of equipment can realize synchronous acquisition. The pressure test system cannot process data in real time at the front end due to the huge collection quantity. For example, a pressure test system with 10240 sensors can acquire data at 300Hz and 64-bit floating point data, while the processing speed of a general workstation CPU is only a few GHz. In addition, a 64-bit computer generally has a data bus to carry other data, and ideally, a peripheral data interface based on UBS3.0 can only transmit about 100Mb/s of data. Thus, referring to fig. 3, the subject is empty, but the pressure data is still displayed, i.e., the pressure testing system cannot collect and process the data.
In this embodiment, the motion capture and the stress test are performed on the subject, wherein a forward dynamics method is adopted, and the synchronization problem between the motion capture system and the stress test system is solved based on the characteristic that the coccyx identification point is consistent with the change rule of the human body centroid, which may be called soft synchronization.
The motion capture system has the advantage of being extremely thick for collecting kinematic data of human joints, but needs human link inertia parameters when calculating the kinematic law of human mass center. The most characteristic of the inertial parameters of the human body is that they change with the movement of the link, due to muscle contraction. The pressure testing system may collect pressure of the foot-support surface interaction. Not only can obtain the pressure distribution of the sole, a butterfly diagram and the step width, but also can obtain the vertical ground reaction force. The kinematics law of the mass center can be obtained by adopting the vertical reaction force through a forward dynamics method. The mechanical energy consumption of the center of mass in the vertical direction is the gold standard for evaluating running technology, and the joint motion law is a specific measure for improving the technology. For the technical paradigm and virtual simulation analysis of the straight-road middle-running trunk, a motion capture system and a pressure test system are all indispensable.
S3, establishing a virtual rotation point of the body coordinate corresponding to the subject through the data acquired by the motion capture and the pressure test, and evaluating the trunk stability according to the virtual rotation point.
Specifically, referring to fig. 3, in this embodiment, Virtual Turning Points (VTPs) of six body coordinates of the left and right sides of the head, the left and right sides of the upper limb, and the left and right sides of the lower limb need to be established; and establishing a quantitative evaluation method of VTP kinematics and kinetics of the body coordinates.
In fig. 4, a is a front view of the end time of the right-hand front swing, that is, the start time of the right-hand rear swing. And B is the right view of the ending moment of the front right-hand swing, namely the starting moment of the rear right-hand swing. C is a front view of the start time of the right-hand front swing, i.e., the end time of the right-hand rear swing. D is a right view of the starting time of the right-hand front swing, i.e., the ending time of the right-hand rear swing.
S31, calculating VTP of the bone marker body coordinates:
in the formula xi、yi、ziRespectively representing the coordinates, x, of the VTP relative to the inertial reference frameo、yo、zoRespectively, the origin of the ontology coordinates of the VTP, and n represents the number of acquisitions.
S32, transforming the position coordinates of the VTP:
x′i＝(xi-xo)，y′i＝(yi-yo)，z′i＝(zi-zo)；
in the formula xi、yi、ziRespectively representing the coordinates, x, of the VTP relative to the inertial reference frameo、yo、zoRespectively represent the origin of body coordinates, x 'of VTP'i、y′i、z′iRespectively, the transformed VTP coordinates.
S33, evaluating the technical advantages and disadvantages of both sides:
in the formula xi、yi、ziRespectively representing transformed VTP position coordinates, Dx、Dy、DzRespectively, mean square error. And matching the dispersion with the stability through the numerical value of the mean square error to realize the quantitative evaluation of the technical characteristics of the straight-road middle-running trunk.
Example two
Referring to fig. 5 to 22, the difference between the first embodiment and the second embodiment is that the virtual simulation analysis is performed based on motion capture data according to a specific case:
testing equipment: an 18-shot Qualisys motion capture system (1200 thousand pixels, capable of real-time 2D/3D and 6DOF motion capture); a gait and running coordination training system of a Zebris-HP Cosmos Treadmill virtual feedback type (number of sensors: 10240).
In this example, the running technique of the subject was diagnosed and optimization recommendations were given by the autonomic and lateral arcade patterns.
Referring to fig. 5 and 6, the pressure peaks were lower in the lateral arcade version of the subject than in the autonomous arcade version, but peak satiety increased. This reveals that for weird: the teaching of "speed secret is tightening of the ankle and increasing the force on the ground to increase running speed" is limited by the product of increasing force and time, rather than the maximum force value itself.
Referring to fig. 7, the pressure distribution report in the dynamic test report can be obtained as follows: the lateral arch ground mode, in which the heel pressure distribution is reduced (left side 110-. Therefore, the outer bow landing mode is superior to the autonomous landing mode.
Referring to fig. 8, from the 12 second single foot pressure report, one can see: the match speed is 3 m/s, and 12 seconds run about 36 m. Consistent with the average pressure profile: the lateral pressure distribution of the outer bow type is more symmetrical.
Referring to fig. 9, according to the gait parameter report, the following can be obtained: the step length of the outer side bow falling mode is reduced, and the efficiency is higher.
Referring to fig. 10, according to the pressure analysis report, the following results can be obtained: the left side gait line of the lateral arch version is denser, which means more stable.
Referring to fig. 11, from the force and pressure report, we can obtain: the left maximum force value of the lateral arch ground mode is reduced from 1719.9N to 1574.5N; the left maximum force value 1679.9N is reduced to 1578.4N, and the left and right differential values are reduced from 40N to 3.9N. This means more symmetry and stability.
Referring to fig. 12 and 13, the vertical reaction force distribution of the subject and 7 elite sprinters at a pace of 3 m is different, i.e., the force distribution is not full enough, and the maximum value of the force is small. Referring to fig. 14, the vertical ground bounce was increased compared to the original gait pattern for the subject at a pace frequency of 155 steps/min, approaching that of 7 elite sprinters, but with a sharp peak and an insufficient force-time product. Referring to fig. 15, the vertical ground rebound distribution was better than 7 sprinters in the united states after the subjects had changed landing pattern at a pace frequency of 155 steps/min in the lateral crook mode. Very full at the peak, a pace of 3 m/s can be achieved with a vertical ground bounce peak of only about 2.5 times body weight at a pace frequency of 156 steps/minute.
And the technique of the subject is subjected to image analysis by adopting the VTP method of the embodiment based on the Qualissys motion capture system: when the shooting frequency is 1500Hz and the shooting duration is 12 seconds, please refer to fig. 16 to 18, for simplicity and to explain the problem, taking the elbow joint as an example, in an autonomous landing manner, the mean square deviations of the displacements of the left elbow in the x, y and z directions are 11.35, 5.25 and 8.07 respectively; the mean square deviations of the displacements in three directions of the elbow at the right side are respectively 10.76, 4.82 and 7.95; the left side is 5.51%, 9.12%, 1.57% larger than the right side, respectively. Therefore, the left side requires enhanced stability exercises.
Referring to fig. 19-21, the subjects used the lateral arch ground method, and the mean square deviations of the displacements of the left elbow in the x, y and z directions were 11.26, 5.20 and 8.36, respectively; the mean square deviations of the displacements in three directions of the right elbow are respectively 10.65, 4.97 and 8.20; the left side is 5.70%, 4.62%, 2.00% larger than the right side, respectively. Therefore, the left side requires enhanced stability exercises.
But the outside bow-and-fall mode is compared with the autonomous fall mode: the lateral arching mode is more stable in the y-axis (coronal axis). For the point-bar frame model of the subject, refer to fig. 22.
Thus, the example of this example shows that subjects who have been warmed up, tested and learned for approximately 1.5 hours change the landing pattern and have a substantial grasp of the lateral arch landing pattern. On the basic gait space-time parameters: under the guidance of a 155-step/minute metronome, the step length of the outer side bow-falling ground mode is reduced by 3 cm compared with the step length of the autonomous falling ground mode, the step frequency is increased by 2 steps/minute, and the outer side bow-falling ground mode: the maximum force value on the left side is reduced from 1719.9N to 1574.5N, which is reduced by 8.45%; the maximum force value on the left side is 1679.9N reduced to 1578.4N, which is reduced by 6.04%; the difference between the left and right sides is reduced from 40N to 3.9N. After changing the landing mode, the distribution of vertical ground bounce forces was better than 7 sprinters in the united states.
Therefore, the motor function and motor skill are very important to the running diagnosis technology, and are not indispensable. The embodiment can realize the combined benchmark test of the motion capture system and the pressure test system without synchronization.
EXAMPLE III
Referring to fig. 2, an evaluation terminal for a straight-road mid-run torso includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the evaluation method for a straight-road mid-run torso in the first embodiment or the second embodiment.
In summary, the evaluation method and the terminal for the trunk running in the straight road provided by the invention have the advantages that the trunk and the two sides of the head, the parts of the trunk connected with the four limbs and the coccyx of the spine of the subject are identified, so that the trunk movement is simplified; the method comprises the steps of carrying out motion capture and pressure test on a testee running on a straight road on the basis of the identification of the testee, matching the motion track of the identification of the spine coccyx with the motion track of the mass center of a human body captured by the motion, correcting delay data of the pressure test, and solving the problem of delay of the pressure test data in the prior art. The method comprises the steps of establishing a virtual rotation point of a body coordinate corresponding to a subject through data collected by motion capture and pressure test, transforming position coordinates of the virtual rotation point, and calculating the mean square error of the transformed virtual rotation point coordinate, wherein the smaller the mean square error is, the higher the stability is, and thus the evaluation result of trunk stability can be obtained quickly.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for evaluating a trunk running in a straight road is characterized by comprising the following steps:
marking the trunk and the two sides of the head, the parts of the trunk connected with the four limbs and the coccyx of the spine of the subject;
performing motion capture and pressure test on a subject running on a straight road on the basis of the identification of the subject, matching the motion track of the identification of the spine coccyx with the motion track of the mass center of the human body captured by the motion, and correcting delay data of the pressure test;
and establishing a virtual rotation point of the body coordinate corresponding to the subject through the data acquired by the motion capture and the pressure test, and evaluating the trunk stability according to the virtual rotation point.
2. The method for evaluating the trunk of the straight road running in the claim 1, wherein the step of marking the trunk of the subject on two sides of the head, the parts of the trunk connected with the limbs and the coccyx of the spine comprises the following steps:
simplifying the motion structure associated with the trunk of the subject into a point rod structure comprising two ears, two shoulders, two hips and the trunk, and identifying the two sides of the head of the subject, the parts of the upper limbs and the trunk at the two sides, the parts of the lower limbs and the trunk at the two sides and the tail bones of the spine.
3. The method for evaluating the trunk running in the straight road according to claim 1, wherein the step of matching the motion trail of the marker of the coccyx of the spine with the motion trail of the center of mass of the human body captured by the motion, and the step of correcting the delay data of the stress test comprises the steps of:
matching the data of the stress test with the data of the motion capture by adopting forward dynamics based on the characteristic that the motion trail of the mark of the spine coccyx is consistent with the motion trail of the mass center of the human body;
and correcting the delay data of the pressure test according to the matching result.
4. The method for evaluating the trunk running on the straight road according to claim 1, wherein the step of establishing the virtual rotation point of the body coordinate corresponding to the subject through the data collected by the motion capture and the stress test comprises:
calculating the virtual rotation point of the bone marker body coordinate:
in the formula xi、yi、ziRespectively representing the coordinates, x, of the virtual rotation point with respect to an inertial reference systemo、yo、zoRespectively representing the origin of the body coordinates of the virtual rotation points, and n representing the number of acquisitions.
5. The method for evaluating the trunk running during the straight road according to claim 1, wherein the evaluation of the trunk stability according to the virtual rotation point comprises:
and transforming the position coordinates of the virtual rotation points:
x′i＝(xi-xo)，y′i＝(yi-yo)，z′i＝(zi-zo)；
in the formula xi、yi、ziRespectively representing the coordinates, x, of the virtual rotation point with respect to an inertial reference systemo、yo、zoEach representing a body coordinate origin, x 'of a virtual rotation point'i、y′i、z′iRespectively representing the transformed virtual rotation point coordinates;
calculating the mean square error of the transformed virtual rotation point coordinates:
in the formula xi、yi、ziRespectively representing the transformed virtual rotation point position coordinates, Dx、Dy、DzRespectively representing mean square deviations;
and obtaining an evaluation result of the trunk stability according to the mean square error obtained by calculation.
6. An evaluation terminal for a trunk running on a straight road, comprising a memory, a processor and a computer program stored on the memory and operable on the processor, wherein the processor implements the following steps when executing the computer program:
marking the trunk and the two sides of the head, the parts of the trunk connected with the four limbs and the coccyx of the spine of the subject;
performing motion capture and pressure test on a subject running on a straight road on the basis of the identification of the subject, matching the motion track of the identification of the spine coccyx with the motion track of the mass center of the human body captured by the motion, and correcting delay data of the pressure test;
and establishing a virtual rotation point of the body coordinate corresponding to the subject through the data acquired by the motion capture and the pressure test, and evaluating the trunk stability according to the virtual rotation point.
7. The terminal for evaluating the trunk running on the straight road according to claim 6, wherein the identification of the trunk of the subject on both sides of the head, the connection part of the trunk with the limbs and the coccyx of the spine comprises:
simplifying the motion structure associated with the trunk of the subject into a point rod structure comprising two ears, two shoulders, two hips and the trunk, and identifying the two sides of the head of the subject, the parts of the upper limbs and the trunk at the two sides, the parts of the lower limbs and the trunk at the two sides and the tail bones of the spine.
8. The evaluation terminal for the trunk running in the straight road according to claim 6, wherein the matching of the motion trail of the marker of the spine coccyx and the motion trail of the human body centroid captured by the motion, and the correcting of the delay data of the stress test comprises:
matching the data of the stress test with the data of the motion capture by adopting forward dynamics based on the characteristic that the motion trail of the mark of the spine coccyx is consistent with the motion trail of the mass center of the human body;
and correcting the delay data of the pressure test according to the matching result.
9. The evaluation terminal of the trunk running on the straight road according to claim 6, wherein the establishing of the virtual rotation point of the body coordinate corresponding to the subject through the data collected by the motion capture and the stress test comprises:
calculating VTP of the bone marker body coordinates:
in the formula xi、yi、ziRespectively representing VTP relative inertiaCoordinates of the reference system, xo、yo、zoRespectively, the origin of the ontology coordinates of the VTP, and n represents the number of acquisitions.
10. The evaluation terminal for the trunk running on the straight road according to claim 6, wherein the evaluation of the trunk stability according to the virtual rotation point comprises:
and transforming the position coordinates of the virtual rotation points:
x′i＝(xi-xo)，y′i＝(yi-yo)，z′i＝(zi-zo)；
in the formula xi、yi、ziRespectively representing the coordinates, x, of the virtual rotation point with respect to an inertial reference systemo、yo、zoEach representing a body coordinate origin, x 'of a virtual rotation point'i、y′i、z′iRespectively representing the transformed virtual rotation point coordinates;
calculating the mean square error of the transformed virtual rotation point coordinates:
in the formula xi、yi、ziRespectively representing the transformed virtual rotation point position coordinates, Dx、Dy、DzRespectively representing mean square deviations;
and obtaining an evaluation result of the trunk stability according to the mean square error obtained by calculation.
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