RU2692026C1 - Apparatus for determining power of performed physical work - Google Patents

Abstract

FIELD: medicine.SUBSTANCE: invention relates to medical equipment. Device for determining power of performed physical work includes strain gauges, analogue-to-digital converter, microcontroller, module Wi-Fi. Information source is a platform for performing exercises – platform scales. Platform for performing exercises is configured to record variable pressure on platform, supply of alternating electrical signal to input of ADC, with function of preliminary amplification and digitization of analogue signal, is mechanically connected to array of bridge strain-resistive sensors. Bridge strain gauges are connected in parallel. ADC input accommodates a capacitor. Capacitor serves as simplest C-filter, reduces induced noise and provides accuracy of measurements. ADC chip is connected to the microcontroller through a serial SPI interface, performs preliminary processing of data and sending it to a computer system via wired or wireless interfaces, visualization and storage.EFFECT: higher accuracy of determining power of performed physical work by determining body weight in dynamics by recording variable pressure in digital numerical expression.5 cl, 3 dwg

Description

The invention relates to the field of medicine and cardiology, in particular, to sports medicine, physiotherapy exercises and medical functional diagnostics, and can be used to monitor the physical performance of a person and his tolerance to exercise, as well as in assessing the physical performance of both healthy and sick people and to simulate the dosed load athlete.

The level of technology

A known automated device (patent RU No. 2441580 dated August 19, 2010, class А61В 5/0205), designed to assess the reserves of physical health and working capacity of the population, contains a block for entering personal information: age, sex, etc. and registration, heart rate measurement unit (hereinafter referred to as HR) at rest, relaxation relaxation measurement unit, blood pressure measurement unit (hereinafter referred to as BP), lung vital capacity measurement unit (VC), growth measurement unit, weight measurement unit, Barbell test unit , Ruffier test unit, visual-motor reaction evaluation unit, spinal flexibility assessment unit, coordination-motor function evaluation unit, shoulder girdle function evaluation unit, abdominal muscles evaluation unit, test unit that PWC170, which constitute a group of measuring modules, the data from which are tabulated and, according to them, in the computation block, determine the index of physical health, which is observed in the information display unit.

The disadvantages of the known device are associated with a significant use in it of manual labor of medical personnel conducting the examination, as well as the lack of accuracy in assessing the level of reserves of human health and efficiency, due to the low motivation of the subject.

A known automated device (see patent RU 2447834 dated December 8, 2010, Cl. IPC AV 5/02) to assess the physical performance of a person, containing a heart rate measurement unit (HR), an input unit for initial data, the first output of which is connected to the first the input of the physical performance determination unit, the outputs of which are connected to the information display unit, and the second input - to the output of the rising rate setting unit, as well as the serially connected digital accelerometer and the signal preprocessing unit, Advantage rate of rising, the first input connected to the second output of the input data input block connected to the second input of the preprocessing block.

A disadvantage of the known device is the limitedness of the complex of movements and muscle groups involved in the motor process, since the load in it is set in the form of moving the center of gravity of the body of the subject when rising from a certain height to a distance equal to the difference between the height of the subject in the standing position and his height sitting position, which registers with an accelerometer of a person attached to the body, which does not provide reliable and sufficiently accurate data when screening Aseleniya.

A known automated device (patent of the Russian Federation No. 140166 for a utility model dated December 27, 2013) for determining human performance, which contains biometric information retrieval sensors at the passive diagnostics phase, and at the active diagnostics phase, contains a heart rate measurement unit (HR), a blood pressure measurement unit (BP), a height measurement unit, a weight measurement unit, a unit for entering personal information: age, gender, etc., a unit for measuring human parameters when performing an exercise on a testing device.

A disadvantage of the known device is that the calculation of the load power when moving on the steps is carried out according to a formula containing a correction factor, which, when calculated, can create a systematic error.

A known automated device (RF patent No. 156151 for a utility model dated December 29, 2014) for determining physical performance and reserves of human health, which is an automated system containing a block for entering personal information and registration, a group of measuring modules that determine indicators of a person’s physical condition on which in the information processing units, namely in the first and second groups of blocks for selecting an existing value, in the analysis and memory blocks of the table, in the calculation block , are stored and compared with previous indicators of human health, and the final information is displayed on the information display unit.

A disadvantage of the known device is the presence of a possible systematic error in the calculation of the power of the load during the strides on the steps created by the correction factor introduced into the calculation formula.

No prototypes were found on the method for realizing the measurement of the center of mass displacement by means of weights (strain gauges) in the available sources.

The aim of the invention is a device with the ability to dynamically measure the body weight of an individual and transfer this data to a personal computer (PC) / mobile device, which is an indicator of determining the power of physical work performed.

The technical task to be solved by this invention is to create a universal design for determining the body weight of a person over time, providing for removing pressure indicators on the device platform during exercise, followed by processing data on a computer to calculate the power of the loads performed and the level of physical performance .

To perform the technical task, a data acquisition device containing a scale platform used as an exercise platform, strain gages, a smoothing filter (for example, a capacitor with a capacity of 0.01 μF), an analog-to-digital converter (ADC), where data is digitized at a frequency of 200 Hz, is proposed. Connected to a microcontroller by a link (for example, a cable,) a Wi-Fi module, through which data is transmitted to a PC / mobile device, the link is a cable. The device may include a rechargeable battery. Data transfer is also possible wirelessly. Unlike standard weight measurement schemes, in this device the weight is measured in dynamics, a capacitor is installed at the input of the ADC, which acts as a simple C-filter, reducing the induced noise and ensuring the accuracy of measurements.

The essence of the invention is that the use of the original design allows a non-invasive method to determine the weight of a person's body in dynamics, on the basis of which the power of the performed load and the level of physical performance are calculated using the PWCno test (PWCaf).

The technical result of the invention is to improve the accuracy of determining the power of the physical work performed by determining the body weight of a person over time by registering variable pressure in a digital (numerical) expression.

The technical result is achieved by the design of the device for determining the power of the physical work performed, characterized by the fact that it contains strain gauges, analog-digital converter, microcontroller, Wi-Fi module, the source of initial information is the exercise platform (weights platform) with the possibility of registering variable pressure on the platform scales, mechanically connected to an array of bridge strain-resistant sensors connected in parallel, with the possibility of receipt of alternating elect a signal to the ADC input, with the function of preamplification and digitizing of the analog signal, a capacitor acting as the simplest C-filter reducing the induced noise and ensuring measurement accuracy is installed at the ADC input, the ADC microcircuit is connected to the microcontroller via the SPI serial interface for preliminary processing of data and sending to the computer complex via wired or wireless interfaces, visualization and storage. As a special case, a capacitor with a capacity of 0.01 μF is used as the simplest C-filter that reduces the induced noise and ensures measurement accuracy. Another special case is when the weighing platform is connected to an array of 4 bridge YZC-1B strain gauges connected in parallel. Also, the AD7793 ADC with pre-amplification and digitization of the analog signal with a frequency of 200 Hz and a quantization depth of 24 bits is used as an ADC with the possibility of an alternating electrical signal being input. In addition, the ADC microcircuit is connected to the ATMega328 AVR microcontroller via the SPI serial interface, for preliminary processing of the received data and sending to the computer complex via wired or wireless interfaces, post-processing, visualization and storage.

Comparison of the proposed solution with the known technical solutions shows that it has a new set of essential features that allow you to successfully implement the goal.

The claimed technical solution explains the images in FIG. 1-3.

FIG. 1 shows a structural diagram of the technical solution of the device; in fig. 2 shows an example of a device platform (scales); in fig. 3 shows an example of the form of the research result.

Where 1 is a complex of strain gauges;

2 - capacitor;

3 - analog-to-digital converter;

4 - microcontroller;

5 - Wi-Fi module;

6 - processing device (PC or smartphone). An example implementation.

The device is made in the form of floor scales; it contains strain gauges (1); a capacitor (2) with a capacity of 0.01 μF, which serves as the simplest C-filter that reduces the induced noise; AD7793 analog-to-digital converter (3); microcontroller (4); Wi-Fi module (5); The power source can be a battery, and connects to a desktop computer or mobile device (6) via a USB interface, or via a wireless Wi-Fi network.

The principle of operation of the device for determining the body weight of a person in dynamics is as follows.

The dynamic load in the form of a squat of a diagnostic object exerts an alternating pressure on the weighing platform mechanically connected to an array of 4 bridge YZC-1B tensorodisterial sensors connected in parallel. The array is necessary to increase the allowable load on the platform scales. The maximum output voltage of the strain-resistant bridge is proportional to the voltage of its excitation and is 2 mV / V. When powering the bridge with a voltage of 5 V, the full scale will be 10 mV.

A variable electrical signal is fed to the AD7793 ADC input, which pre-amplifies and digitizes the analog signal with a frequency of 200 Hz and a quantization depth of 24 bits. At the input of the ADC, a capacitor is installed, which serves as the simplest C-filter that reduces the induced noise and ensures measurement accuracy.

The ADC microcircuit is connected to the ATMega328 AVR microcontroller via the SPI serial interface. A programmable microcontroller is required for autonomous control of the ADC, preliminary processing of the received data and sending it to the computer complex via wired or wireless interfaces for further data processing, calculating the mechanical work performed during squatting (during lifting), the power of the performed load and the physical performance level according to the test PWC ₁₇₀ (PWC _AF ). The number of squats, the time during which they are performed, the pace with which they are carried out (under a metronome or a rhythmic signal from a PC / mobile device) can be arbitrary.

The calculation of physical performance is made by the following formula

where PWC170 is the power of the physical load at which the heart rate is reached = 170 per minute;

W ₁ , W ₂ - power of the first and second loads, W;

f ₁ f ₂ - HR at the end of the first and second loads, beats / min.

Claims (5)

1. A device for determining the power of physical work performed, characterized by the fact that it contains strain gauges, analog-digital converter, microcontroller, Wi-Fi module, the source of initial information is the exercise platform — the weights platform — with the possibility of registering variable pressure on the weights platform, mechanically connected to an array of bridge strain gauges connected in parallel, with the possibility of receiving an alternating electrical signal at the ADC input, with the function pr double amplification and digitization of the analog signal; a capacitor is installed at the ADC input; it acts as a simple C-filter that reduces the induced noise and ensures measurement accuracy; the ADC chip is connected to the microcontroller via the SPI serial interface for pre-processing the received data and sending it to the computer complex by wire or wireless interfaces, visualization and storage. 2. A device for determining the power of the physical work performed under item 1, characterized in that a capacitor with a capacity of 0.01 μF is used as the simplest C-filter that reduces the induced noise and ensures the accuracy of the measurements. 3. A device for determining the power of the physical work performed under item 1, characterized in that the platform of the scale is connected to an array of 4 YZC-1B bridge strain-resistance sensors connected in parallel. 4. A device for determining the power of the physical work performed under item 1, characterized in that AD7793 ADC with the function of preamplification and digitization of the analog signal with a frequency of 200 Hz and a quantization depth of 24 bits is used as an ADC with the possibility of receiving an alternating electrical signal. 5. A device for determining the power of the physical work performed under item 1, characterized in that the ADC chip is connected to the ATMega328 AVR microcontroller via the SPI serial interface, for preliminary processing of the received data and sending to the computer complex via wired or wireless interfaces, subsequent processing, visualization and storage.

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