Criteria for assessing the level of physical fitness and physical state of football players with cerebral paralysis, taking into account their sports classes

Purpose: The article is devoted to finding ways to optimize the training of players with cerebral palsy (CP). It is determined that testing and elaboration of criteria for assessing the level of physical fitness of football players with cerebral palsy can be used as a mean of evaluation the sportsmanship of football players of this nosology in training and competitive activities. The purpose of the study is to determine the level of physical and functional preparedness of football players with cerebral paralysis and to develop criteria for their evaluation during the intensive training period, taking into account the functional classes of

Introduction 1 Sports movement of people with disabilities is a part of the modern Olympic movement. This creates a powerful stimulus to mobilize the body's reserve capacity and gives hope to people with severe disabilities to overcome their diseases [1,2]. This approach takes place in fundamental sources and research of specialists [3 -5]. Ensuring the activities of Ukrainian national teams of athletes with disabilities, their training and participation in international competitions is one of the priorities of the Ministry of Youth and Sports of Ukraine and Ukrainian center "Invasport" [6]. Athletes with disabilities in Ukraine include 4 nosologies [7,8]: with cerebral palsy (CP), with mental and physical disabilities, with vision impairments, with hearing impairments. Football for people with cerebral palsy is played by athletes with ORIGINAL ARTICLE minimal criteria for ataxia, hypertension or athetosis (i.e., three types of disease that are most often associated with people with neurological disorders). Athletes with motor control disorders (brain injuries) have recently been allowed to compete in this sport [9,10]. Scientists have proven that it can be the result of cerebral paralysis, apoplexy or traumatic injury. This impairs the function of the lower limbs and limits the performance of specific skills, for instance, jumping, running, changing directions or dribbling skills [11 -13].
The International Paralympic Committee (IPC) applies a functional system to all athletes participating in official events. It includes eight functional classes: the first four groups (grades 1 -4) correspond to athletes who need a wheelchair to engage in any sport. The last four groups (grades 5 -8) correspond to athletes who do not need a wheelchair. The classification developed by the International Federation of Cerebral Palsy Football PEDAGOGY (IFCPF) was used for CP football. It is defined as the grouping of players into sports classes according to the extent to which their defects affect their motor activity (10, 14). Classification groups assign classes to athletes by collectively reviewing the results of functional and motor tests, which are constantly modified and improved [15 -18]. After the 2016 Paralympic Games, the classification of football CP has undergone very significant changes [9]. Reina et al. [18] have developed four classes (FT) for CPfootball: 1) Class FT5 includes impairments of two legs, impairments of both legs and arms, meanwhile the lower limbs are more impaired than the upper ones; or athletes with dystonia, whose lower limbs are more impaired than the upper ones.
2) Class FT6 includes moderate impairments of all four limbs. Athetosis, dystonia, or ataxia are usually the most common factors.
3) Class FT7 includes the degree of spasticity of body half. Athletes walk, run with a clearly visible limping due to spasticity in the lower limb. 4) Class FT8 includes hemiplegia, monoplegia in the lower limbs; athetosis, dystonia, ataxia, mixed cerebral palsy or other neurological conditions.
Scientists have discovered relations between impairments and limitations of motor activity in this sport [19]. Studies by Anastasiadis et al. [20] showed that players with CP have the basic elements of movement technique, as in classic football, which requires players to use strength, speed, agility, flexibility and endurance. Davids [21] determined that CP-football is characterized by intermittent motor actions of short duration and high intensity. Bangsbo [22] investigated the motor activity of players during a football match. Ovcharenko et al. [23] found that the most backward part in the structure of physical fitness of most football players with cerebral palsy is speed and strength preparedness, which is associated with the peculiarities of the disease. Person with hemiparesis (form of cerebral paralysis) couldn`t do symmetrical movements; jumps and jumps off require compensatory movements of the healthy half of the body. In this regard, the development of jumping in players with lesions of one or both legs are a long and continuous process. As soon as the level of motor activity decreases, and this usually happens in the transition period, muscle atrophy occurs. This significantly negatively affects the speed and strength capabilities of athletes [23].
Considering the complex structure of sports training in team games, experts offer a comprehensive approach to assessing the preparedness of athletes [24,25]. Reina et al. have developed tests used in the classification of players with CP [26]. Meanwhile, there are serious problems with the interpretation of the data obtained during the classification and their use in the training of athletes with disabilities. The reasons are the lack of criteria to assess the level of physical state and physical fitness of players of this nosology during the long training process and, based on this, the inability to compare the initial state of the athlete, his condition against training loads and the required target condition.
The hypothesis of the study is to scientifically predict the possibility of controlling the level of physical fitness of football players with cerebral palsy to improve the quality of their long-term sports training.
The purpose of the study is to determine the level of physical and functional preparedness of football players with CP and to develop criteria for their evaluation during the intensive training period, taking into account the functional classes of athletes.

Material and methods
Participants: 25 football players with cerebral palsy, candidates and members of the national team of Ukraine aged 20 to 34 took part in the study voluntarily. Athletes of the selected group have 5-8 classes of the adapted classification of the International Association of Cerebral Palsy (CP-ISRA) for CP-Football. All athletes gave informed consent to participate in the research.
Procedure: Anthropometric researches on the basic rules and principles connected with selection of means of measuring equipment and methods of measurement were carried out [27]. The following anthropometric parameters were measured: body length, body weight, chest circumference (CC), vital capacity of the lungs (VLC). Bicycle ergometric testing was used to determine the value of maximum oxygen consumption (MOC). During the dispensary examination after warming up (3-4 minutes) and rest, the athletes performed a single physical activity for 5 minutes. Pedaling speed -60 rotations per minute. The load power increases to the range of heart rate -120 -170 heartbeats per minute. After cycling ergometric testing, the values of MOC were determined using a special nomogram [28].
The biochemical method allows determining some biochemical indicators of athletes' condition: the state of training, the state of overtraining, recovery, etc. Strength load on the trainers included exercises for developing maximum leg muscle strength using weights 70% or more of the maximum with full range of motion. It was measured the amount of creatinine, creatine and lactic acid in blood, creatinine and creatine in urine, urea in blood serum before and after strength load performed by players on the trainers.
A running test (cross-country running 9000 meters with an average speed of 3.5 -4.0 meters per second) was used in aerobic mode. The power of work is such that the energy supply of the working muscles can occur (mainly or exclusively) due to aerobic processes associated with sufficient oxygen consumption. Therefore, the power in these exercises can be estimated by the level (speed) of remote oxygen consumption [29]. It was measured the concentration of non-esterified fatty acids (NEFA) and urea in blood serum, lactic and pyruvic acid, glucose and hemoglobin in blood taken from athletes before and after running. Heart rate and blood pressure (BP) were measured to assess post-cross recovery processes. Measurement of blood pressure allows identifying the dynamics of indicators that well reflect the body's preparedness for exercise [30]. Heart rate and blood pressure were registered at rest, immediately after exercise and during recovery.
To diagnose the level of players` special physical training, a minimized set of informational and reliable pedagogical tests was used. It included an assessment of the starting speed for the running time of 10 meters from the spot. Distance speed was measured by the running time of 50 meters from the spot. Speed and strength abilities were registered by the height of jump up from the place with using of a contact platform and an electronic stopwatch. Special endurance was determined according to the integrated time of shuttle run 7 x 50 meters. The informativeness and reliability of these tests have been proven by previous studies [31,32].
Statistical analysis. Data were processed by descriptive and comparative statistical procedures. Mathematical statistics were conducted by the method of calculating quantitative indicators. We calculated the arithmetic mean (x), standard deviation (S). The reliability of the obtained data was determined by Student's t-test and was considered statistically significant at p <0.05 and p <0.001.

Results
Studies of biochemical parameters of football players with disabilities before and after training load with different focus provide an opportunity to find out how training loads affect the physical condition of football players. Running and strength work were offered to football players with cerebral palsy as control exercises. An average speed of football players was 3.5 -4 m·s -1 during the running. Strength load on the trainers included exercises for developing maximum leg muscle strength using weights 70% or more of the maximum with full range of motion. Obtained results show that biochemical parameters of athletes before and after exercise were within the allowable norm for healthy athletes (Table 1).
Test subjects adequately tolerated to proposed large physical load: rapidity of recovery (according to heart rate registration) after running was also quite fast (Table 2). I.e. we can confirm that proposed load corresponded to

PEDAGOGY
the functional capabilities of athletes with cerebral palsy. The positive dynamics of the concentration of lactic acid and urea, the decrease of NEFA after exercise indicate a high level of functional preparedness of football players at the time of diagnosis. The cardiovascular system of football players responded with a combined increase of heart rate, increased systolic blood pressure and pulse pressure. It indicates that athletes' level of preparedness match to performed load.
To assess the impact of the level of players` physical fitness on their game activity, a correlation analysis was calculated between the level of motor skills development and technical and tactical actions during games ( Table  3). The nature of the statistical relationship between the volume of technical and tactical actions and special endurance deserves attention. If we take into account the fact that according to the rules of football CP field`s size is 55×75 meters without fixing the position "out" and each team involves only 7 players, the leading quality in the structure of physical fitness of football players, in our opinion, is special endurance. This assumption was confirmed by the results of correlation analysis.
According to the study design we significantly increased the means of anaerobic (lactate and glycolytic) orientation, rationally combined the loads withs different focus at the stages of the annual cycle. This contributed to the development of motor skills (especially speed and strength qualities and special endurance) [33].
Based on the data obtained during the control and analysis of indicators, we developed criteria for assessing the preparedness of football players with cerebral palsy, taking into account the motor abilities of athletes (their sports classes) ( Table 4).
The presented criteria have three levels. The first level determines the lower limit of physical fitness indicators and physical development of football players with cerebral palsy, who have the highest degree of musculoskeletal disorders (classes FT5 and FT6 of international classification). The second level corresponds to the indicators of footballers with an average degree of musculoskeletal system impairment (class FT7 of international classification). The third level shows physical state of football players with the lowest degree of musculoskeletal disorders (according to class FT8 of international sports classification). Achieving such results allows coaches to select for the national team, as well as to determine the effectiveness of the training process at the stages of the annual training cycle and, in particular, at the stage of preparation for international competitions.

Discussion
The analysis of literature sources on the problem of training football players allowed to establish the importance of the control system during the training process. The obtained results of complex control should be used for planning and correction of training plans. The content of programs and plans depends on their authenticity, reliability and informativeness, and the coach receives objective information about the health and mental state of each player, the impact of physical activity and changes in the functional systems of the body. A lot of experimental material has been accumulated on the problems of long-term training and control in football [24,25]. The authors of these studies thoroughly and in detail considered the issue of pedagogical control of football players' training both in the process of longterm training and in various structural formations of the annual training cycle. Many studies have been aimed to improve the training process of athletes with disabilities in team [34][35][36] and individual sports [37][38][39]. We have developed a program of the training process in the annual cycle for football players with CP [33]. The advantage of our research is the possibility of applying a control system for football players with cerebral palsy. A comparative analysis of the test results of the control and experimental groups, which were trained in different programs and methods, showed the effectiveness of the proposed program. The implementation of this program contributed to the realization of the individual capabilities of the athletes of the experimental groups. Analysis of the results of retesting the level of physical fitness revealed that football players with CP of the experimental group compared to the previous testing had a significant (p <0.05) increase in all indicators. Athletes of the control group had significant improvement (p <0.05) only in indicators of speed.
Athletes with cerebral paralysis can adequately tolerate heavy training loads. Results obtained for the first time in the testing process indicate that the medical and biological indicators of football players with CP before and after exercise were within the permissible norm for healthy athletes. In previous studies, we found certain patterns of influence of physical fitness on the playing activity of football players. A correlation analysis was conducted between the average indicators of the level of motor skills development and technical and tactical actions during official international competitions. This allowed to determine that the leading quality in the structure of physical fitness of players with CP is special endurance. Thus, the higher level of special endurance in players with CP, the greater amount of load they can perform on the field during the game [40]. The results of our studies were supplemented by data from Yanci and co-authors [41] to determine the external load that players perform during games. We supplemented the data of Lukovska with coauthors [42] about a significant reduction in functional and motor abilities of athletes with cerebral palsy during a long break in training, which related to lack of selfmovement.
Reina et al. [43] found that the lagging link in the structure of physical preparedness of football players with CP is speed and strength training, which related with the features of the disease. Differences in jumps between active functional classes (FT5 -FT8) were analyzed and it was determined that only players of class FT8 (less serious lesions) had significantly higher results in all jumping tests than players of lower classes (p <0.01). We supplemented the data obtained by Reina [44] during the classification process about the difference in the level of motor skills between players of sports classes FT5, FT6, FT7 and FT8. FT5 and FT6 players had the worst scores in the tests. Athletes of the FT7 class had limited activity in walking and running on the injured side. Although the athlete usually moves with noticeable limping, it can almost completely disappear while running.
Based on the data obtained during the control and analysis of indicators, we have for the first time developed criteria for assessing the preparedness of football players with CP, taking into account their motor abilities (sports classes). This approach in CP-football is the most correct, because it is justified by the degree of impairment to the musculoskeletal system. This, in turn, in different ways limits the motor abilities of athletes of this nosology. Testing was conducted at the final stage of preparation for international competitions, when players were in the state of greatest training. Quantitative characteristics of the level of physical fitness and functional state can be classified as "regulatory requirements". Their achievement is ensured by the optimal functioning of bodies` basic systems. They are optimal and reflect the real state of the training process on this level of team development.

Conclusions
Literary analysis on the problem of research and generalization of training of football players with CP at the stage of preparation for higher achievements revealed problematic issues. These issues are the lack of comprehensive assessment and the lack of criteria to assess the level of various aspects of preparedness of athletes with special needs. The obtained data of control of physical fitness and functional condition of football players with CP made it possible to develop criteria for assessing the level of players` preparedness. This allows coaches to determine the effectiveness of the training period, to obtain information about players` condition and on this basis to individualize the workload for players and PEDAGOGY adjust the training process. The analysis of the direction of training process is carried out based on the obtained data Also decisions about the correction of the educational and training process of football players with disabilities may be made in various structural formations of the annual macrocycle.
Prospects for further research are the creation of criteria for assessing the technical and tactical readiness of football players with cerebral palsy, taking into account the functional classes of athletes.