Height-adjustable stepper machine for performing step exercise tests

Abstract

Cardiorespiratory fitness (VO2max) is the most important general health indicator for healthy and sick people ranging from children to the elderly. Measuring VO2max is one of the prominent topics in the fields of health, public sports and championships. One of the common methods for measuring VO2max is the stair exercise test, in which a person must walk up a certain height of stairs for a specific time and at a specific walking rhythm. Given the existence of various and valid stair tests around the world, however, each of them has its own specific step height. Especially in the famous modified Francis and Quinn step test, in which the step height is determined based on a coefficient of the individual's height. Therefore, it would be valuable and widely used to design a step device that can accommodate the height of all step tests. The present invention is a portable exercise step device with height adjustment capability with an accuracy of 1 mm that can provide step height for all step exercise tests in the range of 10 to 55 cm. The present invention can be used in educational, research, and rehabilitation centers, and championship sports bases, as well as in physical fitness assessment clinics, to perform various step tests to measure VO2max.

Description

Description of the invention Title of the invention Height-adjustable stair machine for performing stair sports tests The technical background of Astronomy The technical field of this invention is related to the fields of physical education and sports sciences, ergonomics, and health, which is used to perform a variety of step exercise tests to measure cardiorespiratory fitness. The technical problem of the invention's objectives Cardiorespiratory fitness has been introduced as the most important indicator of general health of healthy and sick people ranging from children to the elderly, and its regular measurement and monitoring in schools, sports environments, health assessment centers, and workplaces is important. Also, measuring the fitness of the cardiorespiratory system is widely used in clinical and rehabilitation settings. Sports and health science experts use the quantitative index of maximal oxygen consumption (VO2max) to express the level of cardiorespiratory fitness. Sports science researchers have introduced various methods, including treadmill and bicycle exercise tests, running and walking tests in open environments, and the stair test to measure VO2max (1-4). Among them, the stair exercise test is particularly popular among researchers and subjects due to some features, including the ability to perform it at any time and place, short execution time, simplicity, safety, use of high muscle mass, ability to perform it in large populations, and fantasy (stepping with a metronome rhythm) (5-11). In the stair exercise test, the subject must step up a specific height of a step with a specific stepping rhythm for a specific period of time. This stepping pattern is performed in four phases. Upon hearing the metronome sound (stepping rhythm), the subject first places the right foot on the step, then the left foot. Then, the subject lowers the right foot and then lowers the left foot. In other words, the subject takes one step with each metronome sound. Immediately after the step test is completed, the test subject's heart rate is measured and used in a regression equation specific to the step test to calculate a small amount of VO2max (1). According to research conducted in the field of sports and health sciences, various step tests have been designed according to different populations studied. Among these, we can mention the Harvard, Quinn, McArdle, Cotton, Cruz, Strand, Chester, and other protocols, in each of which the step height indicators, step rhythm, step duration, and VO2max calculation formula are different (5, 8, 11). It should be noted that each of the aforementioned exercise tests has its own specific step height. In particular, in the famous Francis and Queens step tests (8, 12, 13), the step height is calculated and adjusted as a factor of height to adjust for the height difference of individuals during the exercise test so that their biomechanical efficiency during the test is the same. Therefore, researchers, sports and fitness trainers, occupational health and ergonomics specialists must design and build a step with a specific height for that test to use different step tests. This is time-consuming to design and build and also financially costly. Therefore, designing a step device with adjustable height, which can provide the tester with the height of all step tests, would be very valuable and widely used. A portable step device with adjustable height would be a valuable tool for performing different step tests. The present invention is a portable, height-adjustable step exercise device that can provide the examiner with the step height for all step exercise tests. This device can be used in educational, research, and rehabilitation centers, and championship sports bases, as well as in physical fitness assessment clinics, to perform various step exercises to measure VO2max. Therefore, the present invention is designed and manufactured with the aim of performing various step exercise tests that are used to measure the cardiorespiratory fitness of individuals. This mechanical device, by using a gear power generation and transmission system, easily provides the examiner with the desired step height for each step exercise test. Description of the state of the art and history of advances related to the invention of the common law. In order to perform the step exercise tests, which are used to measure cardiorespiratory fitness in different populations, the tester must first prepare a wooden or metal box or bench according to the height of the step exercise test being used (2). Of course, the material, weight, and construction of the box must be such that it has sufficient resistance to withstand the weight of the subjects on the one hand and does not move or slip on the surface during the test. It should be noted that different types of step exercise tests are designed according to the gender, age, health level, and physical fitness of the subjects. In fact, in environments where the step exercise test is used to measure cardiorespiratory fitness, exercise benches or boxes of different heights must be available for performing the test. This leads to the occupation of a large amount of space in the measurement area. Several research studies have attempted to design a device that can be used in all step tests. Based on the investigations conducted, three scientific studies were observed in Iran and abroad that used a device with adjustable height to perform the step test, which we will describe below. In the study by Hessam et al. in 2016, a height-adjustable exercise step device was designed and built (14). In this study, the body of the device consists of a metal frame with four one-meter-high round tube columns welded to its four corners. In this device, the step plate is made of an MDF board with four corners drilled according to the diameter of the body columns. This plate becomes a step by placing the columns inside the four holes of the MDF board. Under the plate, a diamond-shaped jack device is screwed to the bottom of the MDF board from one side and welded to the body from the bottom. By turning the jack screw, the step is adjusted to different heights. This device can provide different heights for performing the step test.The major drawback of this device is the weak body and the presence of slack in the structure of the diamond jack, according to the claims of the companies that manufacture the diamond jack. Also, in the study by Nazim et al. in 2017, an electromechanical device was used to perform the step test (5). In this study, the body and components of the step were made of iron. In this device, an electromotor and dynamo installed at the top of the device were used to adjust the step height. In the aforementioned device, the mechanical force of the electromotor is transmitted to the step plate by a box wire. A three-time keyboard (up, down, stop) is used to move and stop the electromotor, which adjusts the step height. This device is capable of providing the step height in the range of 10 to 60 centimeters. However, one of the weaknesses of the electromotor in the aforementioned device is that each time the electromotor's start and stop buttons are pressed, the amount of change in the step height is large, and the user is forced to repeatedly raise and lower the device's control buttons to adjust the step to the desired height. In other words, the accuracy of height adjustment with an electric motor is low.In addition, perhaps another weakness of this device is its dependence on city electricity. Thus, it cannot be used in conditions of lack of access to electricity (open environments). Abroad, a study in Brazil by Maria et al. in 2014 designed and built an electromechanical step device with adjustable capabilities (15). This device provides the tester with the ability to provide height for various step tests. In this product, a servo motor installed under the device is used to generate mechanical force to adjust the step height. The movement of the servo motor is controlled with high precision by a panel on top of the device, which is one of the strengths of this device. The force generated in the servo motor is transmitted to the two ends of the device by several gears and two horizontal metric screws installed under the device. At the two ends of the device, there are two columns made of metric screws, the force transmitted to them causes them to rotate clockwise or counterclockwise. These two column screws are passed through the nut according to their diameter, which is welded to the step plate.The height of the steps in this device is adjusted by turning the vertical screws in the aforementioned device. However, the operation of this device is dependent on city electricity, which in practice will be unusable in power outages or in open environments. In the three previous devices that were described, despite their creativity and strengths, there is a common limitation. This limitation is due to their design structure, volume, and high weight. So, it is not possible to move them around the city by car. A detailed search was also conducted on the Iranian Intellectual Property website and international websites to examine the patents related to the present designed device. A number of patents related to the present invention were found, a brief description of which is provided in the following paragraphs: � Adjustable Queen Staircase with registration number 105655 (KR102005612B1) step test system for test of physical activity In patent number 105655, a height-adjustable stair device was designed and manufactured. The device consists of four legs, each of which has holes one centimeter apart, which are used in a graduated manner to change the height of the stairs. In this device, the metal plate of the stairs has rings at its four corners, into which the columns of the device are inserted so that the stair plate can move up and down on the vertical axis. In order to fix the stair plate at the desired height, four metal pins are used. In such a way that the pins are inserted into the holes of the columns from under the stair plate at the desired height and the plate is placed on the metal pins, and these pins prevent the stairs from falling. All four pins are inserted into the holes of the columns at the same height from the ground. For this reason, each hole has a number. While this invention is practical, it has a major weakness. According to the manufacturer of the device, the height-adjusting holes are made in the columns at a distance of 1 centimeter.In fact, the height adjustment accuracy in this device is 1 centimeter, which does not allow for precise adjustment for the variable height dependent step test. In our invention, the height adjustment accuracy is less than 1 millimeter. In the patent registered number KR102005612B1, which was made in South Korea, a device for performing a step exercise test has been designed and manufactured. In this device, an electromechanical system for adjusting the height is placed under the step plate. However, given that the aforementioned patent is registered in Korean and provides very few details in the form of images, it is not worth mentioning. In summary, it can be stated that the aforementioned inventions, despite their merits, sometimes have limitations in terms of strength, accuracy in height adjustment, portability, and dependence on city electricity. Providing a solution to an existing technical problem accompanied by an accurate, sufficient, and integrated invention In the present invention, an attempt was made to overcome the weaknesses and limitations of the above inventions as much as possible. For this purpose, the device was designed in such a way that on the one hand it did not require electricity and on the other hand the volume of the device was designed to be as small and portable as possible. Also, the strength and stability of the device when performing the step test were considered very high. In addition, the accuracy of adjusting the height of the step plate is 1 mm. The general view of the present invention is shown in Figure 1. The various components of this device can also be seen in Figures 2 to 7. The present device consists of a sturdy metal frame (Figures 2 and 3) made of 4x4 profile, inside which the step plate is placed. To maintain and stabilize the step plate and also to allow its movement in the vertical axis, two holes are created in the central area of ​​the rear side of the metal frame of the plate, and steel washers are welded to both sides of these holes for the passage of a long bolt (Figures 4 and 5). These two bolts both have the role of maintaining and stabilizing the step plate and, with their rotational rotation, lead to its movement in the vertical axis. In this invention, a gear and bolt power transmission system (Figures 1 and 6) has been used to adjust the height of the step. So that, the simple and smooth rotation of the central gear, which is mounted on a bearing, leads to the movement of two other gears located on both sides of it. The bottom of each side gear is attached to a long foodi screw.By rotating the central gear, the mechanical force generated by the side gears is transmitted to the long steel bolts (Figure 6). By turning the long steel bolts that pass through the steel nuts (welded to the step frame) clockwise or counterclockwise, the step plate moves up or down on the vertical axis. The feature of the bolts and nuts is such that the accuracy of the step plate movement is within a millimeter, which is a strong point for the device. In order to make the device more robust during the test, two holes have been created in the two front corners of the step frame to connect the bushing and pass the shaft through it (Figures 4 and 5). The long shafts pass through the bushings to the height of the device and their two ends are welded to the main body of the device. This technique maintains the strength and stability of the step plate during the test of heavy people (Figure 1). To move the central gear, a steel rod is attached to the top of the central gear. The end of this rod is perforated horizontally to allow a lever to pass through it (Figures 1 and 6).By turning this lever by hand, the central gear moves easily and with minimal force, and by transmitting the mechanical force of the gears to the vertical pages, the step plate moves on the vertical axis. Therefore, the present invention does not require electricity to generate mechanical force. However, by installing a servo motor to the gear, the device can be converted into an electromechanical form. The most important advantage of the present invention is its very simple and attractive mechanical power generation system, which consists of three gears and two long screws (Figure 6). Which is unique, simple, creative and strong among existing exercise step machines. Also, considering that all components of the present invention are made of iron and steel, the strength of the device is very high in movements and when performing the exercise test. So that people weighing more than 120 kg can easily perform the step test on it. In determining the dimensions of the body, an attempt was made to make the final size of the device such that it can be easily moved. So that its dimensions allow it to be easily placed in the seat or trunk of personal cars. This advantage will be very valuable especially when the tester performs the test in different places. Also, in case of mass production, the aforementioned device can be easily stored on top of each other and occupies little space in the storage or place of use. Now let's describe the present invention.The present exercise machine consists of four main parts: frame / body, step plate, mechanical force generation and transmission system, and the step support and strength section (shaft and bushing): 1) Body The body and frame of the present device are made of 4x4 cm steel profile with a thickness of 3 mm, the details of which can be seen in Figures 2 and 3. The dimensions of the length, width and height of the body are 78, 40 and 60 cm respectively. The body of the device is in the shape of a hollow rectangular cube. This device consists of four vertical columns with a height of 60 cm. In fact, the device is in contact with the ground by means of these four columns. To connect the four columns to each other, 3 profiles 70 cm long in the length of the device (two profiles at the bottom of the columns and one profile at the top of the rear columns) and 4 profiles 32 cm wide in the width of the device (two at the top and two at the bottom) are used, which are welded to the ends of the columns and provide the structure and strength of the main body of the device. In the middle of the horizontal profile above the body, a hole with a diameter of 15 mm is installed for the passage of the central gear axis. On both sides of this hole, 15 mm from the edge of the central hole, there are two holes with a diameter of 27 mm for the passage of steel screws.Also, on the lower longitudinal profile along the steel bolts, two holes with a diameter of 15 mm are provided to accommodate the ends of two long vertical bolts. These two holes, on the one hand, stabilize and hold the steel bolts vertically on the body and, on the other hand, allow them to rotate freely around their longitudinal axis. 2) Stair plate The stair frame is made of a 4 x 4 cm steel profile with a thickness of 3 mm, the details of which can be seen in Figures 4 and 5. The stair frame is a rectangular plate with a length and width of 70 and 40 cm. For greater strength of the frame, a profile was welded in the middle of it. On this metal frame, a wooden MDF panel with a diameter of 15 mm is placed, which is connected to it by steel screws. Two holes with a diameter of 27 mm are made on the longitudinal profile of the stair frame exactly in the relief of the steel screws. Steel nuts with an inner diameter of 25 mm are welded at the top and bottom of these holes to match the steel screw. These two holes are the passage points for the steel screws. The direction for the passage of the steel screws is provided. Also, at the two ends of the front longitudinal profile of the frame, two holes with a diameter of 20 mm are made to place a metal bushing. 3) Mechanical force generation system and step height adjustment In the present invention, gears, bearings, metric screws, and nuts are used to adjust the height of the steps. The complete details of this system are shown in Figure 6. As the gears rotate, their mechanical force is transferred to the vertical metric plates, and the step plate is moved along the vertical axis. In the power generation section, 3 metal gears with diameters and heights of 35 and 25 mm, respectively, and a steel bearing with an outer diameter of 40 mm, an inner groove diameter of 20 mm, and a height of 20 mm have been used. The gears are placed next to each other so that the generation of movement in one of them leads to the movement of the other two gears. By creating rotation in the central gear, the side gears, to the ends of which are connected to metric steel screws, also move in harmony with them. Therefore, as a result of clockwise or counterclockwise rotation of the long steel screws that have passed through the steel nuts (welded to the stair frame), the stair plate moves up or down on the vertical axis. A metal rod with a diameter and height of 25 and 68 mm, respectively, was welded to the upper surface of the central gear. A horizontal hole with a diameter of 10 mm was made at the end of this rod so that another metal rod could pass through it as a lever (handle). By turning this handle, the central gear rotates around its axis. Also, a steel rod with a diameter and height of 20 and 15 mm, respectively, was welded to the lower surface of the central gear. This allows the central gear to be placed and connected to the steel bearing. The reason for connecting the central gear to the bearing is that the central gear can rotate easily and smoothly with the least amount of force required. Then, another metal rod with a diameter and height of 10 and 70 mm, respectively, was welded to the end of the 15 mm metal rod. This allows the central axis of the gear to pass through the central hole created on the longitudinal profile of the stair stringer and stabilizes and maintains the central gear in its intended position on the body. On both sides of the central gear, two other gears are in full connection with the central gear. So that when the central gear starts moving, they also start moving around their axis. A metric screw with a diameter of 25 mm and a height of 50 cm is welded to the lower surface of these two gears. The metric screws pass through the nuts welded to the stair frame and their narrowed ends are placed inside the holes made on the lower profile in the main body of the device. On the one hand, these two metric screws keep the stair plate horizontally inside the device body and on the other hand, by rotating around their central axis, they adjust the height of the stairs in the vertical axis. The pitch of the metric screw and its nut was selected in such a way that, while being very strong, it increases the accuracy of the stair movement in the vertical axis to 1 mm. 4) Stair support system In order to increase the strength of the step device during the test, and to prevent the possibility of bending of the step plate during the exercise test, especially in heavy weight people, a metal shaft and bushing system was used (Figure 7). For this purpose, two holes with a diameter of 25 mm were created at the two ends of the step frame in the front part. Inside these holes, a metal cylindrical bushing with a height of 8 cm and an inner and outer diameter of 15 and 25 mm, respectively, is welded. A steel shaft with a height of 45 cm and a diameter of 15 mm passes through the bushings. The lower end of the shaft was welded to the body frame. Also, the upper end of the shaft was welded to the side columns by a steel belt with a diameter of 4 mm. (Figure 1). Explanation of shapes, patterns, and patterns Seven figures are presented for the present device. Figure 1 shows the general view of the device from the front view. Figures 2 and 3 show the front and side views of the device body, respectively. Figure 4 shows the front view of the step plate frame. Figure 5 shows the top and bottom views of the tread plate. Figure 6 is related to the mechanical force generation and transmission system for adjusting the step height. Figure 7 shows the step support system. It should be noted that each of the figures has its own components, each component of which is assigned a number, which includes the following: 1- Device body profile 2- Central hole for the central gear shaft to pass through 3- Side holes for passing metric screws connected to the side gears 4- Lower fixing holes for locating the tapered ends of metric screws 5- Steel nuts for passing metric screws 6- MDF board attached to the stair frame 7- Cylindrical metal bushing 8- Metal stair frames 9- Holes on the side of the step plate for placing and connecting the metal bushing 10-Steel screws to connect the stair tread frame to the MDF board 11-Metal lever / handle 12-Steel rod attached to the top of the central gear 13- End hole of the steel rod for the lever to pass through 14-Side gears 15-Central gear wheel 16-Metric screws attached to the central gear 17- The tapered ends of the screws are designed to fit into the end holes of the stair stringers. 18-Metal rod / shaft attached to the lower surface of the central gear 19-Bearing A clear and precise statement of the advantages of the claimed invention over prior inventions. Using an innovative mechanical gear system that, with minimal force, allows the step plate to be adjusted to the desired heights for each sports test in the range of 10 to 55 centimeters with an accuracy of 1 millimeter. Integrated and robust structural design that provides high strength and resistance during the stair exercise test and during movement. The device is the right size to easily fit in the seat or trunk of a personal car during long-distance travel. Due to its light weight, small size, and portability, it can be easily used anywhere. No dependence on city electricity. Possibility of installing a servo motor next to the gear wheel and turning it into an electromechanical step with adjustable height. A description of the minimum steps required to implement the invention. In general, the present invention is used to quantitatively measure cardiorespiratory fitness (VO2max) in the fields of health, sports, and occupations. To do this, the tester first selects one of the valid sports step tests according to the characteristics of the individuals being tested. It is noteworthy that the step height in each step test is usually different. Then, by rotating the lever located above the central gear, the step height leads to the rotation of the side gears and the metric screws connected to them. Given that the metric screws have passed through the nuts welded to the step plate, their clockwise or counterclockwise rotation moves the step plate on the vertical axis. When the step plate moves, the height indicator attached to the side edge of the plate passes over a tape measure attached to the base and provides the tester with the exact height with an accuracy of 1 mm. Now let's look at a practical example: To measure the VO2max of a 30-year-old man with a height of 180 cm, the Francis step test is used. To determine the step height, we multiply the person's height by a constant factor of 0.192 (12). The step height for this person will be 34.56 cm. Next, using a sports metronome (hardware or mobile phone software), we determine the person's walking rhythm on the step. The subject must walk up and down the step in sync with the metronome rhythm for 3 minutes. 5 seconds after the person's heart rate test is completed, the regression equation specific to the Francis test is entered to calculate a small amount of his VO2max. Express mention of the industrial application of the invention Stair tests are one of the most widely used sports tests for measuring cardiorespiratory fitness. The present invention can be used in various settings, including sports clubs, health assessment centers, physical fitness and sports talent screening, and research studies. Stair tests are used to determine the level of physical fitness for jobs in factories and manufacturing centers by occupational health and ergonomics experts. For example, the Chester Stair Test is an internationally renowned test used among firefighters to measure cardiorespiratory fitness. Resources 1. Medicine ACoS. ACSM's guidelines for exercise testing and prescription: Lippincott Williams & Wilkins; 2013. 2. Medicine ACoS. ACSM's health-related physical fitness assessment manual: Lippincott Williams & Wilkins; 2013. 3. Kraemer WJ, Fleck SJ, Deschenes MR. Exercise physiology: integrating theory and application: Lippincott Williams & Wilkins; 2011. 4.�������� Winter EM, Jones AM, Davison RR, Bromley PD, Mercer TH. Sport and Exercise Physiology Testing Guidelines: Volume I�Sport Testing: The British Association of Sport and Exercise Sciences Guide: Routledge; 2006. 5.�������� Nazem F, Saki H, Jalili M. Validation Of Francis Step Protocol By Respiratory Gases Analyses And Design Native Equation To Estimate Aerobic Capacity In Iranian Boys. 2017. 6.�������� Farhady G, Moradpour GH, Abazari M, Babaee M. Estimating the maximum aerobic capacity of fire fighters using the step test; a case study with height adjustable steps. Journal of Ergonomics. 2016;4(2):60-6. 7.�������� Sabour S, Ghassemi F. Submaximal Step Tests to Estimate MaximalOxygen Uptake in Healthy Adults: Methodological Issues About Validity and Reliability. Sports Medicine. 2016;46(9):1381-2. 8.�������� Francis KT. A new single-stage step test for the clinical assessment of maximal oxygen consumption. Physical therapy. 1990;70(11):734-8. 9.�������� Buckley J, Sim J, Eston R, Hession R, Fox R. Reliability and validity of measures taken during the Chester step test to predict aerobic power and to prescribe aerobic exercise. British journal of sports medicine. 2004;38(2):197-205. 10.������ Izquierdo MC, Lopes S, Teixeira M, Pol�nia J, Alves AJ, Mesquita-Bastos J, et al. The Chester step test is a valid tool to assess cardiorespiratory fitness in adults with hypertension: reducing the gap between clinical practice and fitness assessments. Hypertension Research. 2019;42(12):2021-4. 11.������ Sykes K. Chester step test. Occupational Medicine. 2018;68(1):70-1. 12.������ Culpepper MI, Francis KT. An anatomical model to determine step height in step testing for estimating aerobic capacity. Journal of Theoretical Biology. 1987;129(1):1-8. 13.������ Ashley CD, Smith JF, Reneau PD. A modified step test based on a function of subjects' stature. Perceptual and motor skills. 1997;85(3):987-93. 14.������ Hesam G, Ebrahimi M, Khosravi F, Sattari R, Dehghani F, Moradpour Z. Validity and Reliability of the Height Adjustable Step for Step Test. Journal of Knowledge & Health 2016;11(2):38-43. 15.������ do Socorro C de Sousa M, Aniceto RR, Neto GR, de Ara�jo RC, de Sousa JB, Costa JA, et al. Development and Validation of an Automated Step Ergometer. Journal of Human Kinetics. 2014;43.

Claims

Claims What is claimed: Claim 1) What is claimed is a sturdy metal mechanical exercise step device with the ability to adjust the height of the step plate in the range of 10 to 55 centimeters with an accuracy of 1 mm. This device is designed and manufactured to perform step exercise tests with the aim of measuring cardiorespiratory fitness. The present invention, by using a gear power generation and transmission system, easily provides the tester with the height of the step plate for each step exercise test. The present invention consists of four main parts including; frame / body, step plate, mechanical power generation and transmission system, and the support and strength part of the step (shaft and bushing) Claim 2) According to claim number 1, the body of the device, which is in the shape of a rectangular cube, is made of a strong metal frame made of 4*4 iron profile, with the step plate placed inside this frame and its height adjusted. There are three holes in the central area of ​​the rear side of the body frame. Three gears are placed above these three holes. The central hole is the passage of the shaft of the central gear and the two side holes are created for the passage of steel bolts welded to the two side gears. Claim 3) According to claims 1 and 2, a step plate is located inside the body of the device. The step plate frame is made of 4x4 iron profile, on which a 16 mm MDF sheet is mounted. To maintain and stabilize the step plate and also to allow its movement in the vertical axis, two holes are created in the central area of ​​the rear side of the metal frame of the step plate, and steel washers are welded to both sides of these holes for the passage of long metric screws. These two holes are the passage of steel metric screws connected to the side gears on the top of the device. In fact, these screws both have the role of maintaining and stabilizing the horizontal step plate inside the frame of the device and, by simultaneously rotating clockwise or counterclockwise, lead to the movement of the step plate in the vertical axis. Claim 4) According to claim 1, 2 and 3, in the present invention, in order to adjust the height of the step at the horizontal level, a gear and bolt power generation and transmission system is used. So that, three metal gears are located in connection with each other in the central part and above the metal frame of the device body. These gears are installed in the central area of ​​the rear side of the frame of the device body. A metal rod / shaft is welded to the lower end of the central gear. This rod passes through the bearing in proportion to its diameter and is welded to it. So that it enables free and easy rotation of the central gear. The rotation of the central gear leads to the movement of the two side gears (right and left gears) connected to it. It should be noted that in the gear system, if the central gear rotates clockwise (clockwise), the gears that are directly engaged with it will rotate in the opposite direction, i.e. counterclockwise (counterclockwise), and vice versa. Therefore, by rotating the central gear clockwise or counterclockwise, both side gears simultaneously rotate counterclockwise or clockwise, respectively.The lower part of each of the side gears is welded to a long 50 cm high Fodley bolt. These steel bolts pass through the holes in the body of the machine as well as the holes made in the frame of the step plate and extend to the lower side of the rear frame of the machine body. As the central gear moves, the mechanical force generated by the side gears is transferred to the steel bolts. By simultaneously turning clockwise or counterclockwise the steel bolts that pass through the steel nuts welded to the frame of the horizontal step plate, the step plate moves up or down on the vertical axis and its height is adjusted with an accuracy of 1 mm. Claim 5) According to claim 1, in order to increase the strength of the stepper device during sports tests, two holes have been created in the two front corners of the stepper frame to connect the bushing and pass the shaft through it. The shafts pass through the bushings and their two ends are welded to the main body of the device. Claim 6) According to claim 4, to move the central gear, a steel rod is attached to the top of the central gear. The end of this rod is horizontally drilled so that a lever can pass through it. By turning this lever by hand, the central gear moves easily and with minimal force, and by transmitting the mechanical force of the gears to the vertical pages, the step plate is moved on the vertical axis.

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