CN112121391B - Running dynamic parameter measuring and calculating method and device - Google Patents
Running dynamic parameter measuring and calculating method and device Download PDFInfo
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- CN112121391B CN112121391B CN202010848288.3A CN202010848288A CN112121391B CN 112121391 B CN112121391 B CN 112121391B CN 202010848288 A CN202010848288 A CN 202010848288A CN 112121391 B CN112121391 B CN 112121391B
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B71/00—Games or sports accessories not covered in groups A63B1/00 - A63B69/00
- A63B71/06—Indicating or scoring devices for games or players, or for other sports activities
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B22/00—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements
- A63B22/02—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements with movable endless bands, e.g. treadmills
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B71/00—Games or sports accessories not covered in groups A63B1/00 - A63B69/00
- A63B71/06—Indicating or scoring devices for games or players, or for other sports activities
- A63B71/0619—Displays, user interfaces and indicating devices, specially adapted for sport equipment, e.g. display mounted on treadmills
- A63B2071/0658—Position or arrangement of display
- A63B2071/0661—Position or arrangement of display arranged on the user
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Abstract
The invention provides a running dynamic parameter measuring and calculating method and a device, wherein the method comprises the following steps: after a tester wears the infrared reflector, measuring the distance between the infrared reflector and a connecting line of the infrared transmitter and the infrared receiver on the treadmill according to the infrared transmitter and the infrared receiver which are arranged on the two sides of the running belt, and calculating the vertical amplitude of the tester; calculating the ground contact time of a tester according to the motor rotating speed measured by a rotating speed detection device arranged on the treadmill motor; calculating the step frequency of the tester according to the time interval between two adjacent steps of the tester; and displaying the running parameters of the testers in real time, outputting the maximum value, the minimum value and the average value of each running parameter after the exercise is finished, and displaying a function graph corresponding to each exercise parameter. The problem that the accuracy of the existing motion parameter measurement is not high and the vertical amplitude of motion is difficult to measure is solved through the scheme, various running dynamic parameters can be accurately measured, and users can check various motion parameters conveniently.
Description
Technical Field
The invention relates to the field of motion parameter measurement, in particular to a running dynamic parameter measuring and calculating method and device.
Background
In running training, running posture is an important indicator that athletes need to pay attention to. The correct running posture can lead the athlete to obtain better training effect and improve the running score. The running posture can be generally represented by three index parameters, namely touchdown time, vertical amplitude and step frequency, which are collectively called as running dynamic parameters.
At present, the disclosed treadmill capable of measuring running dynamic parameters generally adopts a sensor to measure the motion parameters of an athlete, for example, a pressure sensor is installed on a running belt, the athlete wears an intelligent wearable device and the like to obtain the dynamic parameters, however, the accuracy of measuring the motion parameters by a sensing device is questioned, and the vertical amplitude of the athlete is difficult to measure.
Disclosure of Invention
In view of this, the embodiments of the present invention provide a method and an apparatus for measuring and calculating a running dynamic parameter, so as to solve the problems of low accuracy and difficulty in measuring a vertical amplitude parameter of a movement in the conventional exercise parameter measurement.
In a first aspect of the embodiments of the present invention, a method for measuring and calculating a running dynamic parameter is provided, including:
after a tester wears the infrared reflector, measuring the distance between the infrared reflector and a connecting line of the infrared transmitter and the infrared receiver on the treadmill according to the infrared transmitter and the infrared receiver which are arranged on the two sides of the running belt, and calculating the vertical amplitude of the tester;
calculating the ground contact time of a tester according to the motor rotating speed measured by a rotating speed detection device arranged on the treadmill motor;
calculating the step frequency of the tester according to the time interval between two adjacent steps of the tester;
and displaying the running parameters of the testers in real time, outputting the maximum value, the minimum value and the average value of each running parameter after the exercise is finished, and displaying a function graph corresponding to each exercise parameter.
In a second aspect of the embodiments of the present invention, there is provided an apparatus for running dynamics parameter estimation, including:
the vertical amplitude measuring module is used for measuring the distance between the infrared reflector and a connecting line of the infrared transmitter and the infrared receiver on the treadmill according to the infrared transmitter and the infrared receiver which are arranged on the two sides of the treadmill after a tester wears the infrared reflector, and calculating the vertical amplitude of the tester;
the ground contact time measuring module is used for calculating the ground contact time of a tester according to the motor rotating speed measured by the rotating speed detection equipment arranged on the treadmill motor;
the step frequency measuring module is used for calculating the step frequency of the tester according to the time interval between two adjacent steps of the tester;
and the display output module is used for displaying the running parameters of the testers in real time, outputting the maximum value, the minimum value and the average value of each running parameter after the exercise is finished, and displaying the function graph corresponding to each exercise parameter.
In a third aspect of the embodiments of the present invention, there is provided an electronic device, including 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 method according to the first aspect of the embodiments of the present invention.
In a fourth aspect of the embodiments of the present invention, a computer-readable storage medium is provided, in which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method provided in the first aspect of the embodiments of the present invention.
In the embodiment of the invention, the vertical amplitude is obtained by measuring and calculating based on an infrared reflector worn by an athlete, an infrared emitter and an infrared receiver arranged on a treadmill, the touchdown time of a tester is calculated according to the motor rotating speed measured by a rotating speed detection device arranged on a treadmill motor, the step frequency of the tester is calculated according to the time interval between two adjacent steps of the tester, the dynamic parameters of each running can be finally output in real time, the maximum value, the minimum value and the average value of each running parameter are output after the exercise is finished, and a function graph corresponding to each running parameter is displayed. The dynamic parameters of the testers can be accurately measured and calculated, the user experience is improved, meanwhile, reliable data reference can be provided for the trainers, and the training efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for measuring and calculating a running dynamic parameter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an infrared reflector according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an intelligent treadmill according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an embodiment of the present invention providing an image of light emitted from an IR emitter onto an IR receiver after being emitted by a reflector;
FIG. 5 is a schematic diagram illustrating a principle of resolving a vertical distance of an infrared emitter according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating the variation of the rotational speed of the motor during running according to an embodiment of the present invention;
FIG. 7 is a schematic view of another embodiment of an intelligent treadmill of the present invention;
fig. 8 is a schematic structural diagram of an apparatus for running dynamics parameter measurement according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons skilled in the art without any inventive work shall fall within the protection scope of the present invention, and the principle and features of the present invention shall be described below with reference to the accompanying drawings.
The terms "comprises" and "comprising," when used in this specification and claims, and in the accompanying drawings and figures, are intended to cover non-exclusive inclusions, such that a process, method or system, or apparatus that comprises a list of steps or elements is not limited to the listed steps or elements.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an intelligent treadmill for measuring and calculating running dynamic parameters according to an embodiment of the present invention, including:
s101, after a tester wears an infrared reflector, measuring the distance between the infrared reflector and a connecting line of the infrared transmitter and the infrared receiver on the treadmill according to the infrared transmitter and the infrared receiver which are arranged on two sides of the treadmill, and calculating the vertical amplitude of the tester;
the infrared reflector is fixed on a tester by a binding belt, the equipment is bound on the chest height of a player, and the tightness is adjusted, so that the two reflectors are respectively attached to the centers of the chest and the back of the user.
Generally, the faster the athlete runs, the smaller the average vertical amplitude, the less energy is consumed by the jolt, and the greater the energy efficiency. The vertical amplitude of the athlete is difficult to accurately measure by conventional detection means, and the accurate measurement of the vertical moving distance can be realized based on the infrared distance measuring equipment in the application.
Wherein, at least, two pairs of infrared transmitters and infrared receivers are installed on both sides of the running belt of the treadmill, the infrared transmitters are positioned on the same side of the running belt, and the infrared receivers are positioned on the other side of the running belt. As shown in fig. 3, at the positions of the four circular dots (10, 20, 30, 40), two fixed infrared transmitters are installed at two circular points (10, 20) on one side of the treadmill, and two fixed infrared receivers are installed at two circular points (30, 40) on the other side of the treadmill. The connecting line of the infrared transmitter and the infrared receiver is vertical to the running belt or the running belt moving direction, the distance between the 10 modules and the 30 modules is X, and the distance between the 10 modules and the 20 modules is Y.
It will be appreciated that in fig. 3, 50, 60 are key-operated modules for viewing the running performance parameters, and 70 is the motor location.
Specifically, the incident angle of infrared incident light is measured by an infrared receiver; calculating the distance between an infrared reflector worn by a tester and a connecting line of the infrared emitter and the infrared receiver on the treadmill according to the incident angle of incident light and the distance between the infrared emitter and the infrared receiver; establishing a linear equation set of two variables according to the distance between the infrared reflector and the connecting line of the infrared emitter and the infrared receiver on the treadmill and the distance between the two infrared emitters or the infrared receivers on the same side to solve the vertical moving distance of the tester; and recording the vertical movement distance change of the tester to obtain a distance change function approximate to a sine wave, and taking the difference value of adjacent wave crests and wave troughs in the distance change function as the vertical amplitude of the tester.
For example, the receivers 30, 40 may measure the incident angle of the incident light ray such as theta1 (theta 1) and theta2 (theta 2), respectively, as shown in fig. 4, and the light ray is reflected by the reflector and finally imaged on the receiver. The focal length f of the receiving light hole of the infrared receiver from the focal plane is known, and the measurement and calculation can be carried out only by knowing the falling point P of the incident light on the focal plane. Through the sensitization components and parts on the focal plane, can obtain each position incident light intensity, the biggest dropping point of intensity both is the P point, then:
further, when θ 1 and θ 2 are obtained according to the above formula, the calculation formula of d1 and d2 is:
as shown in fig. 5, the vertical distance h between the device worn by the tester and the ground can be obtained by solving a system of linear equations:
it should be noted that the chest-back thickness of the tester is engineering enough to be "small enough" relative to the height from the chest to the ground, i.e. the thickness is less than 10% of the chest-ground height, so the influence of the chest-back thickness can be ignored.
S102, calculating the grounding time of a tester according to the motor rotating speed measured by a rotating speed detection device arranged on the treadmill motor;
generally, the average contact time of the athlete is shorter as the athlete runs faster, and the contact time can be trained in a targeted manner, so that the ankle explosive force can be effectively increased. Different from the adoption pressure sensor to measure the time of contacting the earth, this application realizes contacting the earth time through rotational speed check out test set and detects that the result is more accurate.
The belt (running belt) of treadmill is driven by the inside motor of shell, and when the treadmill was unloaded, the rotational speed of motor was comparatively steady, and it is when the sportsman stepped on the belt, the running speed of motor can be reduced to the resistance that brings, makes the short-lived diminishing of motor speed. After the athlete steps on the pedal, in order to keep the belt to move at a constant speed, the operation current of the motor can be temporarily increased, the speed of the belt is in a temporary overshoot state, and then the belt falls back to a stable value.
Specifically, the time interval during which the motor rotation speed changes from the steady value to the lowest value within a predetermined period is taken as the touchdown time of the measurer, that is, the shortest time interval during which the motor rotation speed changes from the steady value to the lowest value within a certain time period. As shown in FIG. 6, by calculating the values of t2-t1, the tester's touchdown time can be calculated.
S103, calculating the step frequency of the tester according to the time interval between two adjacent steps of the tester;
the step frequency parameter of the tester can be calculated by the time interval between two steps (touchdown time), and the formula is as follows:
(unit: times/second).
Further, the method also comprises the following steps:
and the stride measuring module is used for calculating the stride of the tester according to the belt rotating speed of the treadmill and the time interval between two steps. Wherein, the step length is V (t)1，1-t1，2)，(t1，1-t1，2) Representing the time interval between steps.
And the mobile parameter measuring module is used for calculating the ratio of the output vertical amplitude to the stride.
The better the general technique, the more efficient the athlete can run a larger stride at a lower vertical amplitude. The faster the athlete, the less the movement parameters will typically be due to the larger stride.
And S104, displaying the running parameters of the testers in real time, outputting the maximum value, the minimum value and the average value of each running parameter after the exercise is finished, and displaying a function graph corresponding to each exercise parameter.
The intelligent treadmill provided by the application can display various motion dynamic parameters of the athlete (namely, a tester) in real time, so that the athlete can adjust the running posture, and the parameters are in an expected interval. After the movement is finished, the maximum value, the minimum value and the average value of each parameter can be output, a dynamic parameter change function graph is displayed, and the parameter change is intuitively sensed.
In another embodiment of the present invention, a schematic structural view of an intelligent treadmill is provided, as shown in fig. 7, in the schematic structural view, based on a reflector worn by a user and an infrared ranging module on the treadmill, motion data of the user is collected and then transmitted to a CPU of the treadmill through a/D conversion to be calculated to obtain a vertical amplitude parameter.
Based on a rotating speed sensor arranged on the motor, the rotating speed of the motor can be acquired, and after A/D conversion, the time of contacting the ground is calculated by a CPU of the treadmill.
The treadmill CPU can calculate the step frequency of the tester according to the time interval of two adjacent steps stored in the register.
Running dynamic parameters such as vertical amplitude, touchdown time, step frequency and the like are displayed in real time through the display module, and the maximum value, the minimum value and the average value as well as a parameter change function graph can be output after exercise.
The user operation module can not only realize the basic operation of the treadmill, such as pause starting, speed adjustment and the like, but also analyze the running dynamic parameters of the user and control and display various running dynamic parameters.
In the embodiment, the dynamic parameters of the user during running can be monitored, the accuracy of measuring and calculating the running dynamic parameters is guaranteed, the dynamic parameters are displayed on the interactive interface in real time, an analysis report can be provided after the training is finished, and the training effect of athletes is improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Fig. 8 is a schematic flow chart of a method for measuring and calculating a running dynamic parameter according to an embodiment of the present invention, where the method includes:
the vertical amplitude measuring module 810 is used for measuring the distance between the infrared reflector and the connecting line of the infrared transmitter and the infrared receiver on the treadmill according to the infrared transmitter and the infrared receiver which are arranged on the two sides of the running belt after the tester wears the infrared reflector, and calculating the vertical amplitude of the tester;
wherein, at least, two pairs of infrared transmitters and infrared receivers are installed on both sides of the running belt of the treadmill, the infrared transmitters are positioned on the same side of the running belt, and the infrared receivers are positioned on the other side of the running belt.
Specifically, the incident angle of infrared incident light is measured by an infrared receiver; calculating the distance between an infrared reflector worn by a tester and a connecting line of the infrared emitter and the infrared receiver on the treadmill according to the incident angle of incident light and the distance between the infrared emitter and the infrared receiver;
establishing a linear equation set of two variables according to the distance between the infrared reflector and the connecting line of the infrared emitter and the infrared receiver on the treadmill and the distance between the two infrared emitters or the infrared receivers on the same side to solve the vertical moving distance of the tester;
and recording the vertical movement distance change of the tester to obtain a distance change function approximate to a sine wave, and taking the difference value of adjacent wave crests and wave troughs in the distance change function as the vertical amplitude of the tester.
A ground contact time measuring module 820, which is used for calculating the ground contact time of the tester according to the motor rotating speed measured by the rotating speed detecting equipment arranged on the treadmill motor;
specifically, the time interval during which the motor rotation speed changes from a steady value to a minimum value within a predetermined period is taken as the touchdown time of the measuring person.
The step frequency measuring module 830 is configured to calculate a step frequency of the tester according to a time interval between two adjacent steps of the tester;
preferably, the stride of the tester is calculated according to the belt rotating speed of the treadmill and the time interval of two steps; the ratio of the output vertical amplitude to the stride is calculated.
And the display output module 840 is used for displaying the running parameters of the testers in real time, outputting the maximum value, the minimum value and the average value of each running parameter after the exercise is finished, and displaying a function diagram corresponding to each exercise parameter.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
It will be appreciated by those of ordinary skill in the art that in one embodiment, the electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements steps S101 to S104 to implement the running dynamics parameter estimation when executing the computer program.
Those skilled in the art will also understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program to instruct associated hardware, where the program may be stored in a computer-readable storage medium, and when the program is executed, the program includes steps S101 to S104, where the storage medium includes, for example: ROM/RAM, magnetic disk, optical disk, etc.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A running dynamic parameter measuring and calculating method is characterized by comprising the following steps:
after a tester wears the infrared reflector, measuring the distance between the infrared reflector and a connecting line of the infrared transmitter and the infrared receiver on the treadmill according to the infrared transmitter and the infrared receiver which are arranged on the two sides of the running belt, and calculating the vertical amplitude of the tester;
wherein, according to installing infrared emitter and the infrared receiver in the race area both sides, measure the distance of infrared reflector and the two lines of infrared emitter and infrared receiver on the treadmill, calculate the vertical amplitude of tester and include:
measuring an incident angle of infrared incident light by an infrared receiver;
calculating the distance between an infrared reflector worn by a tester and a connecting line of the infrared emitter and the infrared receiver on the treadmill according to the incident angle of incident light and the distance between the infrared emitter and the infrared receiver;
establishing a linear equation set of two variables according to the distance between the infrared reflector and the connecting line of the infrared emitter and the infrared receiver on the treadmill and the distance between the two infrared emitters or the infrared receivers on the same side to solve the vertical moving distance of the tester;
recording the vertical movement distance change of the tester to obtain a distance change function approximate to a sine wave, and taking the difference value of adjacent wave crests and wave troughs in the distance change function as the vertical amplitude of the tester;
calculating the ground contact time of a tester according to the motor rotating speed measured by a rotating speed detection device arranged on the treadmill motor;
calculating the step frequency of the tester according to the time interval between two adjacent steps of the tester;
and displaying the running parameters of the testers in real time, outputting the maximum value, the minimum value and the average value of each running parameter after the exercise is finished, and displaying a function graph corresponding to each exercise parameter.
2. The method of claim 1, wherein measuring the distance between the infrared reflector and the connection line of the infrared transmitter and the infrared receiver on the treadmill according to the infrared transmitter and the infrared receiver installed on both sides of the running belt comprises:
at least two pairs of infrared transmitters and infrared receivers are installed on two sides of the running belt of the treadmill, the infrared transmitters are located on the same side of the running belt, and the infrared receivers are located on the other side of the running belt.
3. The method of claim 1, wherein calculating the touchdown time of the test person based on the motor speed measured by a speed detection device mounted on the treadmill motor comprises:
and taking the time interval of the motor rotating speed changing from the stable value to the lowest value in the preset period as the touchdown time of the measuring personnel.
4. The method of claim 1, wherein calculating the stride frequency of the test person based on the time interval between two consecutive strides of the test person further comprises:
calculating the stride of the tester according to the belt rotating speed of the treadmill and the time interval of two steps;
the ratio of the output vertical amplitude to the stride is calculated.
5. An apparatus for running dynamic parameter estimation, comprising:
the vertical amplitude measuring module is used for measuring the distance between the infrared reflector and a connecting line of the infrared transmitter and the infrared receiver on the treadmill according to the infrared transmitter and the infrared receiver which are arranged on the two sides of the treadmill after a tester wears the infrared reflector, and calculating the vertical amplitude of the tester;
wherein, according to installing infrared emitter and the infrared receiver in the race area both sides, measure the distance of infrared reflector and the two lines of infrared emitter and infrared receiver on the treadmill, calculate the vertical amplitude of tester and include:
measuring an incident angle of infrared incident light by an infrared receiver;
calculating the distance between an infrared reflector worn by a tester and a connecting line of the infrared emitter and the infrared receiver on the treadmill according to the incident angle of incident light and the distance between the infrared emitter and the infrared receiver;
establishing a linear equation set of two variables according to the distance between the infrared reflector and the connecting line of the infrared emitter and the infrared receiver on the treadmill and the distance between the two infrared emitters or the infrared receivers on the same side to solve the vertical moving distance of the tester;
recording the vertical movement distance change of the tester to obtain a distance change function approximate to a sine wave, and taking the difference value of adjacent wave crests and wave troughs in the distance change function as the vertical amplitude of the tester;
the ground contact time measuring module is used for calculating the ground contact time of a tester according to the motor rotating speed measured by the rotating speed detection equipment arranged on the treadmill motor;
the step frequency measuring module is used for calculating the step frequency of the tester according to the time interval between two adjacent steps of the tester;
and the display output module is used for displaying the running parameters of the testers in real time, outputting the maximum value, the minimum value and the average value of each running parameter after the exercise is finished, and displaying the function graph corresponding to each exercise parameter.
6. The apparatus of claim 5, wherein said measuring the distance between the infrared reflector and the line connecting the infrared transmitter and the infrared receiver on the treadmill according to the infrared transmitter and the infrared receiver installed on both sides of the running belt comprises:
at least two pairs of infrared transmitters and infrared receivers are installed on two sides of the running belt of the treadmill, the infrared transmitters are located on the same side of the running belt, and the infrared receivers are located on the other side of the running belt.
7. The apparatus of claim 5, wherein calculating the touchdown time of the test person based on the motor speed measured by a speed detection device mounted on the treadmill motor comprises:
and taking the time interval of the motor rotating speed changing from the stable value to the lowest value in the preset period as the touchdown time of the measuring personnel.
8. The apparatus of claim 5, wherein the step frequency measurement module comprises:
the stride measuring module is used for calculating the stride of the tester according to the belt rotating speed of the treadmill and the time interval of two steps;
and the mobile parameter measuring module is used for calculating the ratio of the output vertical amplitude to the stride.
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| CN113204009B (en) * | 2021-05-12 | 2023-12-22 | 深圳康佳电子科技有限公司 | Running step length reminding method, running step length reminding device, terminal and computer readable storage medium |
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