INFLUENCE OF COMPOUND TRAINING ON PHYSICAL FITNESS IN BADMINTON ATHLETES

ABSTRACT Introduction: Currently, compound rapid stretching training has been explored by sports researchers. However, most research focuses on soccer, basketball, volleyball, and other sports that require vertical jump fitness, but little attention is paid to badminton. Objective: Study the influence of compound rapid stretching training on fitness in professional badminton athletes. Methods: By experimental and statistical methods, 16 outstanding college badminton players were randomly divided into composite training and control groups. The sports performance test (T-shaped run) and short-distance mobility test (5-10-5), were evaluated and compared before and after the intervention, adding a specific rapid stretching training protocol to the composite group. Results: Comparatively, the T-run and hexagonal jump tests were significantly improved in the composite group (P<0.01). The time required to complete the 5-10-5 moving test progressed from 3.980s to 3.763s, significantly longer than the control group (P<0.05). Conclusion: 6-week training with rapid stretching was shown to significantly improve the fitness of college badminton athletes. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.


INTRODUCTION
As we all know, the agility of badminton players is as important as other physical qualities such as strength, speed, and endurance.In particular, the ability to suddenly start, brake, change direction and re--accelerate in the game. 1 At present, fast-stretching compound training has been widely concerned by sports researchers at home and abroad, and a large number of related experimental studies have been done, however, most of the research focuses on football, basketball, volleyball and other sports that have special needs for vertical jumping ability, and relatively little attention is paid to badminton. 2ang J and other researchers analyzed the influencing factors of sensitive quality.The authors mainly outline that the two main components of agility are the speed of direction change and perception and decision factors. 3M Gómez selected 16 high-level badminton male athletes, divided into the fast-stretching compound training group of 8 people (PT group) and the control group of 8 people (CG group), from the perspective of lower extremity biomechanics, the reasons for improving sensitivity before and after the training were analyzed. 4assan M took 12 middle school badminton training class students as experimental subjects, divided into experimental group and control group with 6 students in each group, they adopted rapid stretching compound training and traditional explosive training respectively, after 12 weeks of experimental intervention: Compared with traditional training, fast-stretching compound training can better improve the explosive power of young badminton players. 5Schumacher D took 42 college badminton students as the research object, and used group training to conduct fast-stretching compound training and regular training respectively, two groups of students were given a 6-week experimental training, studies have shown that the sensitive quality of the students in the optional class after the fast-stretching compound training has improved significantly, while the sensitive quality of the students after the regular training has not been significantly improved. 6Xu Y et al. took 20 badminton players as the experimental objects, after 6 weeks of fast--stretching compound training, various sensitive monogram tests were carried out on the experimental subjects, through the analysis of results, the experimental results showed that, rapid stretch compound training has a significant effect on improving and mobilizing the body's agility. 7herefore, the author takes the agility and flexibility of badminton players as well as the rapid expansion and contraction compound training as the starting point, this method is integrated into the physical training of high-level badminton players in the pre-match, and according to the characteristics of the badminton project and the characteristics of the field, innovatively designed a test method that conforms to the special sensitivity of badminton, so as to evaluate the special agility and lower limb flexibility of badminton players.The ultimate goal is to explore the effect of 6-week fast-stretching compound training on the agility of elite male college badminton players.

Experimental subjects and groups
Select 16 male athletes from a high-level badminton team from a university, with more than 10 years of training, and all of them have won the top six in the National College Badminton Championships, and the 1RM squat weight was greater than 1.5 times of their own weight, and they were randomly divided into a rapid stretching compound training group of 8 people (PL group) and a control group of 8 people (CG group).All subjects had no history of lower extremity injury within half a year before the experiment, and the current competitive state was good and healthy.See Figure 1.

Experimental process
The whole experiment consists of three parts.①The first part, the basic power reserve stage: Before the fast--stretching compound training intervention, some regular strength training was used to help the subject achieve an optimal competitive state, so that the subject's 1RM squat weight reached at least 1.  1.

Mathematical statistics
SPSS17.0 statistical software package was used for data processing, and the statistical description was expressed as "mean ± standard deviation" (x ± s), two-factor repeated-measures variance analysis was used for the time index of the sensitive quality test, the between-group factor was grouping (PL group, CG group), and the within-group factor was time (before training, after training); Two-factor repeated measures analysis of variance was used for kinematic indicators, the between-group factor was grouping (PL group, CG group), and the within-group factor was time (before training, after training).When the interaction effect is significant, the simple effect analysis of each factor is performed separately, when the interaction effect is not significant, only the main effect of the two factors is analyzed separately, with P<0.05 indicating a significant difference. 9

Ethical Compliance
Research experiments conducted in this article with animals or humans were approved by the Ethical Committee and responsible authorities of Cangzhou Medical College following all guidelines, regulations, legal, and ethical standards as required for humans or animals.

Figure 1 .
Figure 1.Basic information of subjects 5 times his body weight.Because this type of training can reduce the risk of injury in subjects during 6 weeks of fast-stretching compound training by strengthening ligaments, tendons and bones and muscles.②The second part is the pre-experiment test and the post-experiment test.Pre-experimental tests were conducted three days before the start of training, including badminton agility performance test (T-shaped test), short-distance agile mobility test (5-10-5 test). 8Before each test, subjects performed 1-2 tests at submaximal intensity with the main purpose of becoming familiar with the testing process.After all the tests were completed, a 6-week fast-stretching compound training was conducted, and then a post-experiment test was conducted, the test content was the same as before the experiment.While the fast-stretching compound training was in progress, the two groups of subjects continued their regular badminton skills and tactics training.③The third part: The PL group underwent 6-week fast-stretching compound training, and the CG group underwent 6-week basic lower limb strength training.Comparing the fast-stretching compound training program of the PL group with the basic strength training program of the lower limbs of the CG group, see Table