REFLECTIONS OF FUNCTIONAL TRAINING ON SHOOTERS' GRIP STABILITY

ABSTRACT Introduction: Shooting is a technical sport demanding much control and accuracy from the athletes. Physical fitness is a critical factor for the sport's skill level, and it is believed that functional training can effectively improve the shooter's technical level, ensuring greater athlete stability. Objective: Analyze the results of functional abdominal core physical training on the grip stability of sport shooters. Methods: Random sampling was used to select 26 volunteer shooters as research pairs. An intervention trial was conducted for eight weeks of functional physical training with these athletes. The subjective perception scale of RPE and the exercise intensity comparison table were used for analysis. Muscle contraction data were measured at 3 s before target shooting. SPSS 19.0 software was used to statistically conduct a t-test on the data collected before and after the experiment. Results: There were significant differences in muscle stability and tolerance before and after physical training (P<0.01). The shooter's flexion stability before the test was not as good as during relaxation. The reduced sustained distance before and after physical training significantly improved the tolerance and stability of the abdominal core muscles. The average amplitude of the biceps electromyography was statistically significant compared to before the test (P<0.05). Conclusion: After eight weeks of functional physical training, the shooting stability of pistol shooters was significantly improved. The lack of physical training, especially in the core abdominal muscles, negatively affects the shooters' stability, limiting the quality of the sport. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.


INTRODUCTION
Shooting is the sport with the most technical content in competitive sports.This sport requires high precision in the movements of the athletes.Body balance is the key to improving shooting accuracy.Only when the shooter' s body maintains enough stability can the athlete better grasp the shooting opportunity.The stability of the body when holding the gun is directly related to the stability of the gun.Special exercises for body stabilization during pistol shooting help improve the stability of the firearm. 1 In previous studies, people often used Foots can balanee7.6human type balancer to observe the swing of the body' s center of gravity.The academics measured the electromyography of the arm.Determination of the stability of shooters holding gun barrels with a laser measuring instrument.This paper explores the correlation between gun holding stability and motor performance.In this paper, the stability of the gun-holding power of shooters is indirectly improved through functional physical training. 2The research results of this paper have particular guiding significance for the physical fitness training of gun shooting players.

METHOD Research objects
This paper investigated a sample of 26 shooting athletes from the Shooting Sports Administration. 3The primary data of 13 men and 13 women are shown in Table 1.

Investigation method
This article uses an 8-week functional fitness training interventional trial. 4Experiments were conducted from March to April 2020.This paper used the RPE subjective sensory scale and the Meto-exercise strength comparison table to monitor the training effect.
The evaluation index includes 5.The body movement evaluation indicators include FMS functional movement screening, OSW lower back and leg pain function abnormality survey, and DASH upper limb function assessment scale.
One item of stability evaluation index in the core area.Specifically, McGill' s kernel stability test.This paper uses the frequency domain analysis method to make statistics on the data measured within 3 seconds before aiming.This paper uses the frequency domain method to obtain each parameter's coefficient of variation CV (%). 5 This paper evaluates the changes in data stability observed before and after the experiment.Trials were conducted before and after physical training.

Descriptores: Ac o n d ic io n a m ien to Físic o H u m a n o ; R en d im ien to Físic o Fu n c io n a l; N ú c leo A b d o m in a l; Atleta s.
The pitch angle rotation torque is (2) The yaw angle rotation matrix is (3) In this paper, the unit axial force of the gun is set as e = (x, y, z).α is the roll angle.The quaternion number is

v v v v
+ + + = .In this paper, a matrix of a set of postures can be obtained through the law of quaternion multiplication: training was worse than the body extension stability, while the stability of the right bridge was better than that of the left bridge.(Table 4)

Skin EMG measurements before and after the test
The rate of change of the EMG signal at different positions showed a decreasing characteristic. 8The EMG amplitudes of the upper muscle, the anterior deltoid, the middle deltoid, and the biceps were statistically significant before and after the test (P<0.05).This indicates improved gun stability for the designer athletes.(Table 5) (4)

Data Analysis
This paper uses the electromyography analysis system of DelsysEMG4.0 to measure the muscle data of athletes. 6This article imports the data document into Excel 2010.This paper, SPSS19.0 is used to conduct a t-test on the data collected before and after the test.

ETHICAL COMPLIANCE
Research experiments conducted in this article with animals or humans were approved by the Ethical Committee and responsible authorities of Capital University of Economics and Business, Beijing University of Technology following all guidelines, regulations, legal, and ethical standards as required for humans or animals.

Functional Movement Screening Results
All indexes of FMS were improved after the test. 7The scores for straight bow archery before and after the test were statistically significant (P<0.05).The shoulder flexibility test, push-up stability test, and FMS scores were all statistically significant (P<0.01).The rotational stability score did not change after the test.(Table 2)

Functional test scores
The scores of OSW and DASH questionnaires decreased significantly after the test (P<0.0.5).Low back and leg pain OSW scores decreased by an average of 23.15%, while DASH scores decreased by 34.14%.(Table 3)

Core Stability Test Results
There were significant differences in muscle tolerance and stability after functional physical training (P<0.01).The flexion stability of the body after

DISCUSSION
The stability of this paper refers to the problem of gun holding stability in shooting competitions.It refers to the swing range of the barrel in the target paper sighting area and the control of the hitting time. 9Its stability is mainly reflected in the shaking amplitude, relative static duration, and shaking.Stability is not set in stone.There is also a slight wobble when the gun is stable.Firearms' stability depends on the human body' s stability and the coordination of human senses. 10The stability training program is one of the overall training programs developed by the coach.Its main goal is to improve the stability of the gun.It includes two aspects, physical training and the other is special training.
Functional fitness training is critical to shooting performance.Its fundamental goal is to improve athletes' physical functions through various

Table 2 .
FMS Screening Scores Before and Before the Trial.

Table 3 .
Functional Assessment Scale Scores.

Table 4 .
McGill stability results before and before testing.

Table 5 .
Comparison of the coefficient of variation of the amplitude means before and after the test.