SU1706651A1 - Strain-gauge hand dynamometer - Google Patents

Abstract

The invention relates to physical culture and sports and can be used, in particular, to determine the efforts of squeezing the brush with digital-analog recording on a paper tape with the ability to track the dynamics of fatigue of the muscle groups of an athlete's hand. The aim of the invention is to extend the functionality by registering the dynamics of the change in the compressive force in the process of increasing fatigue. The goal is achieved by replacing the mechanical indicator with an electronic digital indicator. The device has a mode for tracking muscle group fatigue and a mode for direct measurement of muscle effort. The strain gauge hand dynamometer contains a duralumin housing 1 with a partition wall of a dowel ”, e-bridge, eight strain gauge 2, upper and lower clamping film, limit guides, strain amplifier. eps-ktrichesky bridge, autonomous b-uk power. The electric part of the dynamometer contains a strain gauge 2, a strain amplifier 5, an electric bridge 6. power supply unit 7, the first digital indicator 8. a reset button O, a peak detector 11, a low-pass filter 12, a second digital indicator 9 The athlete squeezes pressure plates with his hand upper and lower strain gauges included in the diagonal of the bridge. As the muscles become fatigued, the dynamometer reading decreases. In the mode of direct measurement of the athlete's strength, the developed force is recorded on a digital indicator. 5 or

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The invention relates to physical culture and sports and can be, in particular, used to determine the brush compression forces with digital-analog registration and with paper tape registration with the ability to track the dynamics of fatigue of an athlete's muscle groups.

A device for training the muscles of the hands is known, which contains a fluid-filled body with two working cylinders, a liquid remover and means for moving the displacer with tensioned cables and handles, which can be rotated by the athlete's effort. In order to improve the performance properties of the housing has a partition, and the cylindrical containers are located in the housing in parallel and communicate with each other.

It is also known a device for training the muscles of the foot, which has an adjustable seat fixed on the base and a body with platforms for fixing the foot placed on it. The device has load springs of different stiffness, some of which are connected at different angles to the base of the platform, while the body is mounted on the base of a hinge with the possibility of changing its position in the vertical plane and fixing at an angle of 25-35 ° to the base.

A device for training an athlete is known, comprising an athlete accommodation means installed on the base, a monitor, a control unit, a signal measuring unit, a signal shaping and conversion unit, a power supply unit and sensors located on the athlete and on the athlete accommodation means. To increase the efficiency of the training, it has racks with ball bearings and with power cylinders for connecting them, respectively, with the base and with the means for accommodating the athlete, made in the form of a shell with a pivoting saddle and platforms for loading the muscles of the legs and inside it a frame consisting of pivotally connected levers with their power cylinders, amplifiers, a comparison unit, a generator of reference signals with a decoder, the sensors connected to the inputs of the signal conditioning unit The output of which is connected to one input of the signal conversion unit, the other input of which is connected to one output of another amplifier, the outputs of which are connected to the outputs of the conversion unit and to one output of Olok Compar.

In addition, the ATE dynamometer is known with a price of 0.1 g; i Yu kg scale.

The closest technical solution to the proposed one is a digital dynamometer designed to locate for a possible time.

maximum effort. If the force is less than the initial one, then the circuit disables the time counter, so the device records the maximum force retention time. An essential element of such a diameter gauge is the presence of an elastic element with longitudinal sensors. The power of the sensors is pulsed. There is an amplitude detector, keys, a comparison circuit, a time counter, a block of long time memory, a pulse generator, a logic unit, two amplitude detectors, two comparators, an amplifier, a block of large-scale voltage dividers, two voltage repeater, a comparison circuit.

0 Iron frame, m yellow. In the initial state on v.; The strain gauge signal is zero. A dynamometer using a switch connects to a large-scale voltage amplifier. Time counter and

5 channels of long-term memory are set to zero with the help of a key. When deformation occurs at the output of the sensor, a pulse signal arrives at the amplitude detector,

0 produces a signal that at the time of passage of a pulsed signal corresponding to the greatest deformation, is proportional to the applied force. In Memory mode, the signal from the output of the elastic

Item 5 enters the channel of non-volatile memory. The voltmeter shows the minimum force value recorded manually or on a computer. In the Measurement mode, the voltage is applied to a voltmeter indicating the current value of the force. The subject is informed of the value that he must develop and maintain. Following the voltmeter indicator, the subject develops a predetermined force. The magnitude of the voltage on the circuit is compared and becomes larger. The comparison circuit provides a signal permitting the counting of the time that occurs until then. until the subject develops an effort greater or given

0 differently. When the force is reduced, the comparison circuit generates a signal prohibiting the operation of the time counter. Therefore, the counter shows the delay time effort I.

5 The disadvantages of the digital dynamometer are its complexity, as well as the inability to trace the dynamics of change in effort during the process of increasing muscle fatigue and to determine the degree of muscle fatigue by the fatigue coefficient.

The aim of the invention is to improve the functional capabilities by registering the dynamics of changes in the compressive force in the process of increasing fatigue.

The goal is achieved by using a lightweight, non-deformable frame with strain gauges of perpendicular force.

Strain gauge hand dynamometer contains (Fig. 1 and 2) non-deformable lightweight frame 1, strain gauges 2. upper and lower clamping strips 3, limiters 4, strain amplifier 5, DC electric bridge 6, first digital power supply unit the indicator 8, the second digital indicator 9, the reset button 10, the peak detector 11, the low-pass filter 12 The strainers are made of a rubber frame 15 mm in diameter (FIG. 3). 3-4 turns of constantan wire are laid into the groove of the frame. Winding is double, Ofil pn. Before winding, the wire is bent and folded into two wires of wire, which are then wound around eight frames. Winding is consistent. The total impedance of all sensors is 625 ohms. The tensorizer 5 is made on a single chip of type K 553 UD 1 (Fig. 4). The amplifier has a feedback circuit. The peak detector consists of a diode and a capacitor (Fig. 5). and the low pass filter contains a resistor and a capacitor. The reset button 10 is connected by open contacts parallel to the charging capacitor through the limiting resistor R2.

Strain gauge hand dynamometer works as follows.

The athlete squeezes the presser bars 3 with the hand (FIG. 1). Clamping plates on the upper and lower; strain gage 2. The strain gages 2 with a resistance of 625 ohms are included in one of the arms of the electric bridge 6 (Fig. 2). A diagonal amplifier 5 with negative feedback is included in the diagonal of the bridge. When compressing the hand dynamometer, fatigue of the arm muscles develops and squeezing decreases: jr. le. The decrease in force with; -. 3) with fatigue is determined by the decrease in the readings of the digital indicator 8. After some time, for example, after 1 minute, the results obtained are recorded and compared with the initial ones. Ko: b | n1 is the fatigue index / is defined as the number of times the dividing of the initial indicator of effort and acceleration after 1 min, i.e. K y - FH.H: FI min.

Thus, the athlete’s muscle fatigue ratio determines muscle endurance. ii, o especially important in sports, such as mountaineering. Simultaneously with the effort -, - 5, the force indicators on the first digital indicator 0 register the maximum effort of the athlete on the second digital indicator 9. This indicator loses the signal from the output 10 of the peak detector 11 and the low-pass filter 1. Peak detector 11 saves the maximum force reading and feeds them through the RC circuit 12 to the second digital indicator 9. After taking the maximum force reading using the reset button 1C, after pressing it, zero is set on the indicator 9 and the device is ready for the next measurement. Thus, the second digital indicator 9 fixes 0 with the maximum compressive force, and on the first digital indicator 8 there is a gradual decrease in the readings of force with a gradual fatigue of the arm muscles. After 1 minute (or another time), a reading of this reading and a determination of the coefficient of fatigue Qu occurs.

The effect of applying a strain gauge hand dynamometer is that it can be used to trace the dynamics of change in effort with fatigue of the arm muscles, and this degree of fatigue can be quantified using the coefficient of fatigue Q. If one athlete has more Ku, then his muscle endurance is low 5 and he needs to train his muscles for endurance with the help of special exercises. In addition, the informative indicator is also the maximum force developed by the cnopi-0 shift, which is also determined. Thus, using the proposed device, it is possible to determine both the maximum strength of an athlete and endurance, i.e. the ability to resist rescue; ochimu- 5 with fatigue. In other words, it is possible to determine strength endurance, which is especially important in sports. Since the proposed device is lightweight, compact, portable and economical, it can be used to test athletes on hiking conditions, for example, in the mountains to test climbers. And it is motley that the muscles of the climbers' arms must be not only strong, but also hardy, in order for 5 to be held on a rock with cf. Therefore, the proposed device can be successfully used in mountaineering.

The proposed device can GL: TV used not only in sports, but also to measure the Cholesk muscle strength and can be used in anthropology, neuropathology, balneology, professional selection, as well as in the practice of physiology and occupational health.

Claims (2)

1. Strain gauge hand dynamometer containing skeleton, indicator, load cell, amplifier, characterized in that, in order to expand its functionality by detecting the dynamics of compression force in the process of increasing fatigue, a DC electric bridge, a peak detector, low pass filter; digital liquid crystal display. 0 five an autonomous power supply unit, pressure plates, the TSN sensors are connected in series with an electric DC bridge, a strain amplifier, a peak detector, a low-pass filter, a second digital indicator, the output of a reset button is connected to the second input of a peak detector and a low-pass filter, the second output of the tensor amplifier is connected to the input of the first digital display. 2. The dynamometer according to claim 1, which means that the device frame is made of a non-deformable structure with eight strain gauges of perpendicular action fixed at the ends and connected to each other in series. Installed 0 Preparation of constantan wire for skeleton tenyudtchin 6 and ilarnogo winding Pc3UHOSti / U frame I TD, juz p B60 616 sho Copstantano & a wire. Figz yooo 15k 98 K553UD Yuk 50QO Jt FIG. five