SOCCER PLAYER’S PHYSICAL TRAINING FOR PHYSICAL FUNCTION IMPROVEMENT

Introduction: Soccer is an intensely competitive sport. With its development and elevation in techniques, athletes’ higher demands for physical fitness, strategy, and tactics are presented. An excellent physical training protocol is essential to achieve these goals. Objective: To study how soccer players can improve their physical function in physical training. Methods: Soccer players from a school were selected as research subjects. Physical training interventions and follow-up tests were performed on soccer players during training. Physical training included a physical function test and a body composition test. Finally, SPSS16.0 software was used for statistical analysis of the obtained data. Results: The mean hemoglobin and red blood cell concentration mean values in the athletes’ final test increased slightly compared to the first test; the difference was insignificant (P>0.05). However, the hematocrit index improved significantly (P<0.01). Conclusion: Physical training can reduce the body fat content in the physical function of soccer players and reduce the weight of soccer players. This physical training mode can be used as a reference standard for the physical training of other high-level soccer teams. Evidence Level II; Therapeutic Studies - Investigating the result.


INTRODUCTION
Football is a fierce confrontational sport, with the development of sports and the improvement of the level of football, higher requirements are put forward for athletes' physical fitness and strategy and tactics.Under fast and fierce confrontation conditions, how to accurately use technology to win the game is the goal of football, athletes should strengthen their physical training at ordinary times, maintain a stable physical strength, give full play to your value on the field, in order to win honor for the collective. 1 Football players should pay attention to the recovery of sports fatigue during physical training, according to the characteristics of football, the mechanism of fatigue should be analyzed, looking for measures to recover physical fitness, provide necessary reference for football teaching and training. 2Based on this, the proposed use of South Korea's BioSpace company Inbody3.0body composition tester to test body composition separately; Use Beckman Coulter's GEN.S blood cell analyzer and other instruments to test body functions before and after training.Physical training can reduce the body fat content of football players, but the impact on muscle circumference is related to the training form and load. 3

Research objects
A male youth athlete on the football team of a sports school in a city.

Basic information of test object
50 test team members, average age (24.73±2.66)years old, the average height is (200.63±8.38)cm, and the average weight is (103.53±13.37)kg.

Test arrangement and test method
1.Test location: Training base.

Test time:
The body composition test is carried out in 2 times, and the first test is carried out in the morning, as a base value; The second test was carried out on the morning of the last day.The physical function test is divided into 3 times, and the first test in the morning is the basic value; The second test was conducted on the morning of the 11th day; The third test was conducted on the morning of the last day. 4. Test method: The physical function test is about 7 o'clock in the morning, athletes take blood from their fingers on an empty stomach; the body composition test is also at around 7 in the morning, the athlete takes an empty stomach, removes socks, step on the sensing area of the body composition tester with both feet, grasp the handle of the tester with both hands, wait for the tester to complete the analysis.

Physical training plan and load arrangement
This training is divided into 3 stages, among which the first stage is the adaptation stage, make the team members adapt to the environment and prepare for the later physical training.The physical training load in the first 3 days is low, the training content mainly focuses on shoulder, knee, and ankle joint maintenance exercises and core stability, core dynamics, and low-intensity aerobic endurance training on the mat; The first formal strength training class after the start of the 4th day, the load intensity and amount have been improved. 5The second stage is the improvement stage, and 3 formal physical training sessions are arranged, the goal of physical fitness training is to improve the team members' specific physical fitness, at this stage, the intensity and amount of training load gradually increase, and the interval between sprint runs is shortened, the strength training intensity and the training intensity of the combined ball increase, speed up the completion rate.The third stage is the breakthrough stage, where physical training and special events are more closely integrated. 6n this study, in the definition of load intensity and load, the maximum value of the main load indicators (bench press, squat, high pull) in the last 2 weeks is used as the standard to determine the load intensity; The total weight of the main load indicators is used to determine the load.The high load schedule is reflected by the percentage of each index in the daily maximum load and total weight during the training period, the relationship between load intensity and load.(Figure 1)

Changes in physical function indexes of physical training athletes at various stages
The changes of physical function indexes of football players at each stage of training are shown in Table 1, among them, the indicators HB, RBC and HCT that reflect the oxygen carrying capacity have undergone significant changes after training (P<0.01),there was a gradual increase in the three tests, compared with before training, after training, the three indicators increased by 5.3%, 6% and 7.5% respectively; the BUN and CK indicators reflecting the load intensity changed significantly on the 11th day of training (P<0.01),increased by 19.3% and 58.8% respectively, but in the next 10 days, the two showed a downward trend, by the 21st day, the average value of

The first three days
The first stage The second stage The third stage the two is lower than the pre-training level; The average value of testosterone (T), an indicator of the body's anabolic ability, dropped slightly on the 11th day of training, but in the next 10 days it showed a sharp upward trend, the test value on the 21st day increased by 11.9% compared with the second day (P<0.05);Similar to the testosterone index, the average value of cortisol (C), which reflects the body's catabolism, also shows a trend of first decreasing and then increasing, it also dropped on the 11th day, and then returned to the level on the 2nd day after 10 days; The T/C ratio showed a gradual increase trend throughout the training phase, but there was no significant change (P>0.05). 7

Changes in physical fitness indicators of athletes in various stages of physical training
The changes of football players' body shape indicators before and after training are shown in Figure 2 and 3, the total water content and protein content of the athlete's body increased slightly after training, but the change was not significant (P>0.05);The average weight of athletes decreased slightly (P>0.05), and the content of skeletal muscle increased (P>0.05), the fat content decreased by 16.2% after training, the difference was significant (P<0.05);The change in body fat percentage also reached significant (P<0.05),reduced by 15.9%; athletes' basal metabolic rate has increased, but there is no significant difference (P>0.05). 8In terms of muscle circumference, athletes' chest circumference, hip circumference, waist circumference, right arm and right leg circumferences all tend to decrease after training, but the difference was not significant (P>0.05),only the change in waist-to-hip ratio reached significant (P<0.05),which was 2.4% lower than before.

DISCUSSION
In this study, the average values of HB and RBC of the athletes in the second test only increased slightly compared with the first test, the difference is not obvious (P>0.05),but the HCT index has been significantly improved, a significant effect has been achieved (P<0.01), the reasons may be as follows: First, before this training camp, most of the athletes have been training for nearly one month, during this period, athletes also carried out aerobic endurance exercises, so that the basic values of HB and RBC were higher; Secondly, the first test of this study was not in the plains, but in the early morning of the second day, athletes were stimulated by hypoxic environment to increase EPO secretion, improved the basic values of HB and RBC, so that the 2 indicators in the second test did not change significantly .
Use SPSS16.0 software to carry on statistics and analysis to the obtained data.The two-sample variance T test is used for the changes of various indicators before and after training; All parameters are expressed as mean±standard deviation (x±s), among them, the test of body shape index adopts the comparison before and after training, the physical function index test uses the second and third stages to compare with the first stage, the significance level (*) is P<0.05, the very significant level (**) is P<0.01, and the insignificant level is P>0.05.

Figure 1 .
Figure 1.Relationship between Altitude Training Load and Intensity Changes in Week 13.

Table 1 .
Changes in physical function indexes of physical training athletes.