2. The main measurement methods of sports diagnostics

2.1. Sports anthropometric measurements

“Anthropometry is the science of measuring the human body and drawing conclusions from the dimensions. Sport anthropometry deals with the analysis of the human body’s abilities, physical properties, dimensions and physical characteristics associated with individual sports. His results are mainly used in children’s sports choices and team sports for post-selection, and play an important role in the development of training plans and methods for sports students and athletes. Auxology is a field closely related to the field of sport anthropometry, which examines the law of juvenile growth (Dickhuth, 2005, cited by Balogh, 2016). Its results are mainly used in enrollment, in the assessment of the physical development of children, or in certain aptitude tests, such as military rankings.

The most commonly used body sizes in sport anthropometry:

Height dimensions: height, shoulder height, elbow height, wrist height, finger height, hip height, knee height, ankle height, seat height.

Width dimensions: shoulder width, delta width, chest width, basin width, elbow width, wrist width, knee width, ankle width.

Depth dimensions: chest depth.

Circumference: chest circumference, waist circumference, waist area, forearm, hinge area, handcuff, thigh, leg area, ankle.

Thickness dimensions: front and back of upper arm, shoulder, abdomen, hips, thigh on frontal leg.

The most commonly used sports anthropometry tools are:

anthropometry,
seat height measuring table
measuring tape,
gauges,
condylus width (joint width) meter
touch probe,
skinfold
thickness meter (caliper)
personal scale,
dynamometer.

The growth, development tables, and growth curves of several body sizes, compiled from the results of anthropometric-auxological measurements, show the percentile values of a given body size in a given population (Drinkwater and Ross, 1980, cited by Balogh, 2016). The percentile is a percentage that expresses the percentage of a given population that is at most a given size (eg 5% percentile height of British women (P5) 1585 mm, so 95% of British women are higher at this value). It is the fundamental task of growth and nutrition, the role of doctors and nurses following the development of infants, children and adolescents. For sporting or post-selection purposes, a sports anthropometric examiner will also determine the growth and development status of a subject in comparison to these percentile values. It can be determined that a child grows or develops at a faster pace or faster or slower.

Acceleration is the acceleration observed in the rhythm of growth. A complex phenomenon that a most of the body size and early ripening is an important feature. Accelerated newborns may be born with a higher body weight and body length, may have higher weight and body lengths in infancy, the bone system may ossify earlier, and the first teeth may appear earlier. In young children or school-age children, body weight, body length and other body sizes can grow faster, permanent teeth break earlier, sexual maturation and secondary sex can occur earlier, and in men, menopause may be delayed. Among the causes of acceleration include changes in nutrition, increased protein content and vitamins, increased meat consumption, the effect of growth hormones that stimulate the growth of animals in animal feeds, urbanization trauma to the nervous system (noise pollution), previous sexual enlightenment and sexual life, heliogenic effects , ie, stronger solar radiation due to lighter dressing, and increased artificial light (light sources), vitamin D formation, UV light. The sum of the listed stimuli is also typical. Overall, the rise in living standards can be mentioned as the main accelerating effect.

An accelerated, higher-than-current, stronger child in high-end competitions can achieve outstanding results due to his physical abilities. However, in most cases only its growth and development is faster, reaching adult body sizes sooner. Much to adulthood his contemporaries catch up, and at this point he can no longer enjoy the benefits of his physical abilities. That is why, in many sports, professionals who are thinking in the long run - not just age-old competitions - are not looking for accelerated children. In addition, acceleration can have adverse effects. Many health problems (eg rheumatism, diabetes) may occur at an earlier age.

In contrast to acceleration, retardation is a slowdown observed in the rhythm of growth. There are phenomena that are contrary to the manifestations of acceleration in the growth, development and maturation stages. Slower growth and developmental children do not really expect high achievements in live sports, but regular physical activity is strongly recommended for them, because they have a good chance of speeding up their slow progress. Acceleration or retardation is detected in the knowledge of the biological age of the child under study. It is also possible to determine which calendar age the subject of the study is at an appropriate level of development. In this case, we are comparing the development of certain biology types with age-group averages. These biology types are morphological age based on teeth, ossification, sexual maturation, secondary sexual characteristics and body sizes. Morphological age is determined on the basis of body sizes, and these are compared to the auxology charts mentioned earlier. Usually we use height and body weight. It is very important that auxological tables represent the population to which the subject belongs, so data from other countries cannot be used for this purpose. These reference values should be repeatedly (usually every ten years) repeated, so older data is also not suitable for morphological age determination (Ángyán, 2005, cited by Balogh, 2016).

“Anthropometric features that influence sport or post selection are, for example, height. Higher body height is an advantage in high jump, basketball and volleyball, but it can be a hindrance to horse riding, cycling and weight lifting. For example, in the case of handball or football, successful defensive players (and some of the attackers) are generally higher. However, the control players are lower, well-performing, and playful players with a lower center of gravity. Basketball players also observe that controllers are often lower than their teammates. The methods by which children ’s adult height can be estimated with a relatively high degree of accuracy can facilitate children’s choice of sports. The need for forecasting was mainly due to medical, ergonomic and career choices. But it would be good to know how much the young adult’s height will be when educating the young.

It is also possible to estimate the adult space (Mészáros and Mstai, 1990, cited by Balogh, 2016). Their product estimation process predicts adult height based on the knowledge of the physical development of Hungarian children. In 90% of the 385 children examined, the adult stature could be estimated with a difference of less than ± 3 cm. The difference is not only due to a methodological error, but also to the fact that there may be large differences in the growth rate of individuals. The table for determining the morphological age discussed earlier includes the measured and interpolated height of body height of 0.25 per cent of the age of 18 years.

However, when using the above-mentioned human biology and anthropometric characters as a fitness indicator, it must be taken into account that this is only an opportunity for selecting sports or posting or preparing for a particular sport. Additionally, factors that are extremely important for the athlete to achieve outstanding results are all contributing to this. These include springiness, stamina, speed. the right reaction time and perfect health. Just the right body or ideal body composition is not enough to achieve outstanding results, but it is an opportunity that provides a good starting point for the coach. However, this is not enough to achieve the sportwheels. In addition, a high level of knowledge of the particular sport technique is not enough. The competitions are preceded by conscious preparation, paying attention to the athlete’s lifestyle, form timing, well-defined type, amount and intensity of workouts, duration and quality of relaxation and regeneration between training sessions, and the athlete’s diet and well-chosen diet. In a competitive situation, there is a need for psychic preparedness, motivation, success and tactical discipline, or improvisation. Excellent health and fitness and concentration are essential. ” (Balogh, 2016)

2.2. Load performance tests

“All professionals, coaches, trainers and physical educators dealing with sports, sports health, physical education, or recreational activities have the task of preserving health through the prevention of diseases caused by a sedentary lifestyle and successful amateur or competitive sports. In doing so, professional, physiological and sporting-minded endurance enhancement, improvement of cardiovascular and respiratory function, and development of muscle function is desirable and indispensable. Exercise (ergospirometric) tests in the laboratory are test methods used to determine the level of cardiovascular, respiratory, (cardiorespiratory) and metabolic functions (Somfay, 2008, cited by Balogh, 2016). The study is indirectly suitable for the assessment of current health and performance. Exercise-physiological examinations are the analysis and evaluation of physiological indicators of current performance. Different sports movements and jobs have a specific load profile, which must be taken into account in the targeted tests. When analyzing physical performance, we have to take into account the fact that human organs have different proportions in the performance of the task, but overall the quality of performance is the most important aspect. However, from the point of view of development, it is important that the functional characteristics of each organ system are and whether they need to be developed. The tests are carried out by increasing the resistance on a bicycle ergometer by increasing the belt speed and inclination angle on a conveyor belt ergometer, where dry gas meter, turbine or pneumatic devices are used to measure inhaled oxygen. The face-mounted mask, which is connected to the gas analyzer by a sensor, is then separated by gas fractions, with the aim of measuring O2-CO2 levels. Spiroergometry is often associated with a blood test where the pH, lactate level and anaerobic threshold can be determined.

Thanks to more accurate, faster sampling, the collection of data during static measurements, dynamic monitoring, movement and performance has become increasingly important. These tests are a great burden on the body of the subject, so more conditions have to be met in order for such an examination to be carried out in a laboratory. It is important that the subject is willing to take part in the examination, to be as healthy as possible and to wear light sportswear. True load tests provide the most accurate data about a person’s current condition. These tests are suitable for accurately showing the physiological parameters of the subject (pulse, blood pressure, ECG, etc.), while measuring the aerobic or relative aerobic capacity and physical performance of the subject. You can also get a picture of your muscular performance, as the performance time and speed for each level are measured during performance. Because the body’s oxygen uptake is closely related (direct proportionality) to energy flow, we can really measure the aerobic work ability of the subject. Knowing this, it is possible to determine under what conditions you should train for further development. Since the goal is to determine the real maximum performance (discussion maxima), it is necessary to exercise great care while observing a number of important medical rules. So we know real load tests, as well as comfort tests. During the actual stress tests, the individual undergoes a specific protocol and monitors the changes in the body. The essence of relaxation tests is that after a well-defined load, the body’s relaxation rate and the changes that occur during calming are examined. By using the most appropriate protocols and tools, you can follow changes occurring both during and after the load.

In terms of protocol types, we know staged protocols and ramp protocols. For staggered protocols, we vary the speed of the load every 2-3 minutes by increasing the speed, inclination, resistance, and occasionally by several factors. During ramp (ramp) protocols, one or two parameters (eg speed and inclination) change every minute. As far as possible, maximize the burden of discussion. This is especially important in sports, but may be important from a medical diagnostic point of view. The maxima of the discussion means that we examine the maximum loadability and performance of the individual, so it is also called border load. If someone is involved in a discussion at maxima, the protocol should be chosen so that the person in question is able to achieve maximum performance so that it is not hindered by any technical hurdles, fatigue. The size of the body, the sport, and the state of fitness must be taken into account. The load really requires great performance from the subject. This is achieved by moving at least 50% of the total muscle mass during exercise. Such movements are running, cycling and rowing. That’s why there are conveyor belt ergometers, bike ergometers and paddle ergometers Usually used. There are certain load protocol suggestions: for running carpet loads eg the Bruce protocol increases the speed and slope, and the Balke protocol only suggests a slope increase. ” (Balogh, 2016)

2.3. Sensors of collecting athletes’ data

“The sensors convert inputs into signals that can be interpreted and recorded on electronic devices. Sensors generate different electrical signals that are constantly changing. The following is the most important thing to do during sports sensors are described.

Time lapse: these sensors can be electronically (stopwatch), optical (light gate) or mechanical (startmechanics).

Distance: Linear motion with magnetic position sensors and potentiometer. In both cases, the measurement is based on the electrical resistance. It is possible to rotate determine the resistance by pulling down the cable on the potentiometer.

Speed: Measured with optical and cable solutions. Radar speed measurement is also used.

Angle, Angular Speed: By sensing magnetic or optical change between two arms. Power, pressure: with electrical conductivity, piezoelectric crystals, capacitive sensors.

Acceleration: piezoelectric, semiconductor, capacitive sensory detection. Spatial orientation: possible with inertial sensors.

Volume: microphone allows volume measurement.

Measurement of biological signals: ECG (electrocardiography), EEG (electroencephalography), EMG (electromystrophy) is based on changes in skin conductivity.

Concentration of respiratory gases: spirogeometry analyzes the ratio of oxygen to carbon dioxide. Respiratory Monitoring: Electroconductive textiles allow monitoring of respiratory changes based on chest movement.

Temperature: Thermometers can be liquid, bimetallic or infrared.

Oxygen Saturation: Usually examines the oxygen-carrying capacity of the blood using two different infrared light sources on the fingertip.

The sensors can basically be divided into two types based on output: - analog signal for fuses (electrical voltage, charging) - digital signal security (bit, byte). ”(Balogh, 2016)

2.4. Motion analysis systems

“The key to analyzing any human movement is to be able to quantify, quantify the movement. We can define parameters such as speed and direction of movement, fast direction changes and acceleration. There is a wide range of tools available for performing motion analysis from a simple camcorder or smartphone to serious laboratory testing. In general, motion analysis systems operate primarily with markers (active and passive) or with different sensors.

Initially, motion was analyzed with a series of camera shots, but nowadays we have digital cameras to record full motion in high-space-time resolution. Due to the development, it is not a problem to fix the fast and dynamic movements with the exact and high quality as well as the tennis ball in a tennis match. Accurate detection of motion is a fundamental feature of motion analysis software as well as signal processing.

Visual Tracking Systems: Motion analysis can be done in two or three dimensions. For a two-dimensional motion analysis, we need a simple camera that allows us to accurately capture movements like simple one-plane movements (bending of the elbow, the movement of the human body, if we take the whole body into consideration). The more complex movements we analyze, the more the accuracy of two-dimensional motion analysis decreases. However, there are a number of related actions that can be analyzed in three dimensions. Deciding whether to analyze in two or three dimensions is based on the parameters used for a comprehensive understanding of movement and quantification of movement. The exact results are based on the correct position of the camera. In a two-dimensional analysis, in order to avoid distortion of the image, the camera should be positioned perpendicular to the plane of movement, as far away from the movement as possible. The three-dimensional analysis provides much more accurate and detailed information about the motion to be analyzed. The use of the three dimensions is necessary when the movement contains much more complex elements. The more dimension of motion analysis, the greater the need for technology to capture motion. For the simplest implementation, there is a need for a camera that is perpendicular to the previous one. However, the more complex the movement (obscuring, etc.), the more likely it is that “invisible points” occur. In order to achieve the most appropriate result, at least two cameras are required for the measured points, but accuracy can be further increased (redundancy) by adding additional cameras. As the number of cameras increases, not only does the number of hardware grow, but also the computing and human resource requirements for data processing.

The wearable technology, the wearable, wearable technology for first hearing, seems to be one of the dynamically developing areas of current high technology. There are more and more tools that offer bracelets, glasses, watches, clothing and many other unforeseen features in many other forms. But the history of wearable devices goes back a long way. Already around 1300 the spectacles appeared, 1500 on the pocket watch, and in 1600 on the ring the abacus was the top of the technique. The innovation of the early 1900s was pigeon-mounted cameras that were used mainly in the First World War. In 1960, the most popular gambling player was the analogue computer that could be used to win the roulette. In 1963, TV glasses were introduced. The 70s was a great hit with the calculator wristwatch and the portable walkie-talkie. The 80s wristwatches were already playing music. The bluetooth headset has been available since 2002, and since 2006, the events have accelerated, new and newer devices are constantly being deployed:

Personal health and fitness management.
Treatment of diseases within health care.
Enhance performance in sports.

Although each area is difficult to separate, it is appropriate for these three areas focus. For example, some devices can use a wearable heart rate monitor to maintain health, fitness, and performance. (KARIM, 2014).

Personal health and fitness have a huge potential for wearable devices. Among other things, heart rate monitors, step counters, and exercise program followers allow the wearer to easure and develop their individual lifestyle. These tools allow people to record their personal health and fitness data accurately and up to date.

Activity meter: These devices are most commonly used in personal health and fitness management. These devices are usually available via Bluetooth. Newer devices also measure sleep cycles and blood oxygen levels. Bracelets are increasingly made of “skin-friendly” materials for accurate measurements, and integrate more and more sensors into them. Blood pressure measurement, respiratory monitoring, hydration, pulse and blood carbon dioxide can be continuously and simultaneously recorded.

GPS Monitor: GPS monitors are widely used in leisure and competitive sports to collect performance information from users. Garmin is one of the largest providers of GPS navigation devices, and has also developed a number of fitness watches and bracelets that can be used for both sports and leisure. Garmin Forerunner series watches are also suitable for measuring distance, speed, time, height and speed with GPS. Garmin has also created a follow-up tool for the training program that includes similar features as other devices in the category.

Other Wearable Devices: There are countless other interesting wearable devices that can control your personal health and fitness. PosturePulse (2014) is a belt with sensors that monitors the position of the spine by vibrating to indicate a permanent posture. Lumo Back is a similar device that should be worn at the bottom of the back and measures posture, number of steps and time spent sitting or sleeping (Lumo, 2014, cited by Balogh, 2016). The BIOMAN T-shirt includes ribbed “smart fingers” that measure the user’s heart rate, respiratory rate and skin temperature. Later, the garment could be used to measure the moisture of the skin and the electrophysiological signals.

Portable Devices for Some Sports: Made for a tennis player to follow the movement of the arm during the game. The built-in accelerometer, gyroscope and magnetometer allow you to track the game (Smashwearables, 2014) and analyze it, allowing access to data on your smartphone. For golf players, a handheld device has been developed to help you achieve the best hand for golf. For cyclists, sunglasses with data visualization have been developed. The integrated GPS, accelerometer, gyroscope, magnetometer, thermometer, altimeter and barometer also include a heart rate monitor, including the ideal cycling cycle. Typically, chemical detectors that can be worn as adhesive plugs allow for sweat measurement, so that fluid replacement can be scheduled during sports. This important information makes it possible for the athletes to rehydrate properly, thereby ensuring fluid and electrolyte balance. ”(Balogh, 2016)

2.5. Match Analysis Systems

“Technology has spilled over the last decades in the field of sports, which is most evident in the” evolution “of football. Thanks to the preparation, the training methods, the nutrition, the development of rehabilitation, the players and the game itself have accelerated, changed. For example, in today’s football, all matches in elite championships are recorded. Thanks to these recordings, teams can prepare themselves perfectly for their opponents, as well as learn and correct their mistakes. This was not always the case. Until the 1970s, there were only very limited possibilities to view recordings of their own matches. Regular purchasing of videos made of opponents was a privilege. From the 80s onwards, the situation has been steadily improving and professional teams have increasingly seized this opportunity. Regularly analyzing their own matches, tactical shortcomings were constantly corrected. When they mapped their opponents, they were prepared for their weaknesses. Finding weak points, they built tactics for the shortcomings. Recordings of selected players are now”required" for review. We can state that one of the catalysts of football change was the mediation and recording of matches. Technological advances have accelerated the development of football. With the improvement of cameras and computer software, new dimensions have been opened in football (Edgecomb and Norton, 2006, cited Balogh, 2016).

With digital analysis nowadays science can document and analyze all the elements of the matches. The data thus obtained give an objective and objective picture to the staff. Numbers are able to shed light on the virtues and weaknesses of the team (and every player within it). Such analyzes also show details that have been hidden so far. Computer analysis is one of the innovations that are constantly ringing in professional football, but they also benefit from other sports (hockey, basketball, American football, etc.). A few years ago, the service was unprofitable for low budget teams. Thanks to continuous improvements, everyone is now available. During the match analysis, we primarily focus on performance from a tactical approach at individual or team level. The explosive change in technology has made it possible at all levels (amateur, professional sports) for sports professionals to perform computer-based analyzes based on serious databases. Continuous and intense change in technology makes it easy to imagine what we are describing as an outdated method next year as a solution. Regarding match analysis systems, we distinguish between general and special systems. Due to its name, special software deals with the analysis of a specific sport.

General Match Analysis Systems: General-purpose match-analysis software can be fully customized, so your user decides what sport he / she is developing. A typical example of this is the Sportcode system. General purpose match analysis systems are basically capable of indexing the video of the match, ie marking the location of the most important events. The categories (for example, in the case of football: corners, free kicks, irregularities, goals, etc.) are organized by the sportsperson and decided by the system. It is an important requirement for the system to be able to record and index video, perform queries based on various aspects, as well as display statistical data, drawings and produce interactive videos. Like all systems, general game analysis systems also have advantages and disadvantages. As an advantage, we can use the system for several sports, so we can save a lot of money. We can export the data and other analyzes into other data processing or display programs, and we can display them on machines where the program is not installed.

The disadvantage of the system is that sports-specific data structures may be missing from the system. It’s hard to create a template for all sports. For some sports, special display tools (such as a special chart) are used, so they can only be created if they have previously exported the data to another program and make the necessary appearance there. There are two ways to record the events of a match: a given time point or time interval. The latter is a particularly good example of team games where ballistic possession is of paramount importance. The recording of events is applied differently for each system, where both modes are available, but there is also a system where we can record only a moment. After the event categories are encoded, events are usually recorded on a data entry interface within the system. The event list created after recording is also varied for each system. There is only one that is listed in a table, but there is also a system where it is represented in the form of a graphical timeline. We can record many of the features of each event. For example, in the case of a passport, the target person, position, effectiveness, etc. After the coding, the analysis is done and then the summaries are prepared, in which the most important and most learned events of the given match are cut.

Special Match Analysis Systems: Special Match Analysis Systems include specialized sport-specific systems that can only explicitly analyze that type. For example, in the case of football, such a system is specifically Prozone. The advantage of specialized systems is that it offers the user a much more specific and detailed opportunity for a particular sport. It contains only the data and functions that are absolutely necessary. You can better manage specific events in a particular sport and do not need to compromise on general analytical systems. The Prozone system is a well-known player tracking system for football. The great advantage of the system is that it does not have to be installed for every stadium, and even available for small teams. The system is more than a general analytical system that includes sports-specific elements such as showing the direction of passports (Carling et al., 2006, cited by Balogh, 2016).

“The most significant technological innovation of the past decade in the performance analysis of team games is player tracking systems that have opened up new opportunities for tactical analysis. The performance of the training and the match will be measurable for coaches, but they will also provide useful information for players and those interested in statistical data. Several tracking technologies are available, the most commonly used methods being described below. GPS technology is the most common method for tracking players because of their low cost. The GPS device is carried by the players themselves with the help of a special fastening (vest) on the upper arm or on the back. Using GPS signals, which the player wears on the device, the distance traveled can be determined from which the speed can be calculated. The data, or a device that is also worn by the player, is stored (in hours) or is transmitted directly to the computer via a wireless connection. GPS devices that are already suitable for testing sports performance are more expensive and their sampling rates are higher than conventional GPS devices (5-10 Hz - 1 Hz). Due to more accurate measurements, advanced player tracking GPS systems are complemented with other sensors such as accelerometer or gyroscope.

The disadvantage of these systems is that, for example, signal strength decreases in the environment of larger buildings, but is also influenced by current atmospheric conditions. There is also a drawback to systems that, depending on the sport activity, there may be a problem in the device itself (shading, covering). In analyzing the match, such systems can basically determine the distance traveled and the average speed, but the speed is not accelerated and decelerated (Holanek, 2014, cited by Balogh, 2016).

„During the training, the collected data is transmitted to a server, which can be evaluated online by a trainer on a computer, or on a tablet, using a variety of analytical programs to evaluate performance data, and can immediately report back to the athlete. Using a complex analysis system, we can customize the load depending on the individual physical parameters of the athlete (heart rate, etc.). The given match can be accurately analyzed in the light of the physical parameters (running quantity, speed, acceleration, braking), which makes the preparation effective. Building on international reference data, training can be tailored to the individual and position, increasing team and athlete performance. Radio-based player tracking systems operate on the same principle with GPS systems, but are much more limited in terms of space (for example, suitable for a football pitch). Players wear a so-called transponder that responds to traditional radio signals with an ultra-wideband short-wave radio signal. The ultra-wideband modulation signals are received by sensors in the monitored area and then transmitted to the computer. This kind of observation is more accurate than GPS technology, for example, for certain systems, more accurately measured speed, acceleration and deceleration at a given time. Like GPS, it can be fully automated, but it is a relatively costly solution, but the biggest drawback is that you need to look for the inconvenience of transponders.

Modeling: In sport, modeling plays a major role in correct positioning and the right response is the key to victory. Observational biomechanical models are typically well-developed, while dynamic models still need refinement. The main problem of the models is the reaction of the components and the construction of the models.

Simulation: Using the simulation, you can “predict” the effects of a given workout and tactic based on the data available to players and the team. Of course, the more complex a system is, the less data is available, the more it grows chance that the simulation will not work as expected. In recent years, there have been areas such as fuzzy modeling and neural networks and pattern analysis. Video Technology: Recorded recordings allow you to master the individual movements, control them objectively, and practice them.

Measuring Instrument Training: Accurate real-time biomechanical and psychological data capture provides feedback that provides additional information about the motion characteristics. Feedback may be by sound or light.

Animation and Simulation: Visual visualization can be better used for verbal explanation when practicing complex motion sequences. Reviewing from different angles and playback speeds offers great opportunities. Augmented Reality, Virtual Reality: The player can display the ideal trajectory for real objects, for example, in the case of basketball. Virtual training is particularly beneficial for sports that depend on weather or location (for example winter sports).

Communication and Collaboration Tools: Different blogs and forums have been in use for a long time, but student-based systems open up new areas of training. During the training, immediate feedback and questioning will be possible. In general, such systems allow feedback by the input device (for example, smartphone, laptop) at the students. ” (Balogh, 2016)

CHECKING ISSUES

How could you define sport anthropometry?
Which are the most commonly used body sizes in anthropometry?
What are the most commonly used sports anthropometry tools?
What are the exercise (ergospirometric) tests for?
Which are the main motion analysis systems?
What kind of match analysis system is the Sportcode system?