EFFECTS OF STRENGTH TRAINING ON PHYSICAL STABILITY IN DANCERS

ABSTRACT Introduction: Ballroom dance has evolved from a simple self-taught part of folklore to a technical, performative, and artistic competitive dance called the International Standard Dance. Objective: Study the effects of special lower limb strength training on the physical stability of dancers. Methods: 20 volunteers, students of a university specialized in dance, were divided into experimental and control groups, undergoing training of 30 minutes daily, 3 times a week, for 3 months. The control group followed the daily training, while the experimental group received special lower limb strength training. The relevant physical data measured before and after the intervention were statistically analyzed. Results: Compared to the control group, there was a significant difference in the athletes of the experimental group (P<0.05). The experimental group's lower limb strength and special skills were significantly improved. Conclusion: The lower extremity strength training protocol significantly improved the dancers’ muscle strength, proportionally increasing the stability of the sports skills. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.


INTRODUCTION
With the evolution of time and the rapid development of modern technology and culture, sports dance is no longer a simple and self-entertaining folk dance, but has developed into a technical, performative and artistic competitive dance, it is called the International Standard Dance. 1 And if you want to get a good place in the competitive sports dance competition, core strength training is one of the key factors.
Mprab C believes that sports dance emphasizes speed and strength, and requires sports dancers to strengthen special speed and strength physical fitness exercises.Physical fitness is only a certain aspect of athletic ability of sports dancers, and does not cover the training of athletes' functions and willpower. 2Noveletto F conducts research on the core stability and core strength of sports dancers, the author said that ballet is basically one of the training methods for most of my sports dance teachers in sports dance teaching, and after many studies, it has been confirmed that it can promote the basic quality of sports dancers. 3Rafiq M T believes that one of the charms of the standard dance is the smooth and graceful movement of the dancer in the dance, where does this movement come from, the key method and the correct application, all from the movement principle of the standard dance. 4In terms of physical quality, it is specifically the difference in line, proportion and speed and strength; Most of the gaps in artistic expression originate from the cultural backgrounds of China and the West, behind which is the gap between profound historical accumulation and rich cultural literacy.Ignacio G believes that agility is essential for athletes and ordinary students to master the skills of various sports, establish correct technical dynamic stereotypes, the formation of good muscle proprioception and other aspects have had an important impact, which is the basis for quickly and correctly mastering sports techniques. 5Lum D believes that with the development of standard dance in the world towards a higher and stronger direction, if standard dancers want to keep up with the pace of its development, they must make great efforts in the training of standard dancers. 6Meattini R's research found that the main laws of the growth process of sports dance champions are reflected in the influence of the environment and the mining of musical talent. 7o sum up, in terms of sports dance, the research on the impact of lower limb strength training theories on the special physical fitness of standard dance athletes has not been involved, therefore, the author wants to learn from the existing researches on lower body strength training and standard dance training, in order to explore the impact of lower body strength training on the special physical quality of standard dance athletes, and to further enrich the practice methods of standard dance training and improve the theory of standard dance training.

METHOD Research object
The author takes the students who specialize in standard dance as the experimental objects, among them, there are 20 people in total, and the influence of lower limb strength training on the special technical ability of standard dancers is the research object.The subjects were randomly divided into groups according to grade, height, weight and physical fitness training, the situation after grouping is shown in Table 1, there is no significant difference between the experimental group and the control group after statistical test (P>0.05),indicating that the principle of random grouping is met, and the experimental design and experimental research can be carried out on the basis of this grouping.

DOCUMENTATION METHOD
Obtained through electronic retrieval of electronic databases such as China Journal Network, China Excellent Doctoral and Master's Thesis Full-text Database, and professional network search engines such as Google and Baidu. 8Search keywords such as "strength training", "lower body strength training", and "sports dance" to find relevant literature.For organize and analyze the existing research results, get the latest information on standard dance strength training research in countries around the world. 9

Experimental content
According to the needs of this research, the experimental subjects were divided into two groups, 10 people in each group.One group is the control group, and they carry out technical and physical training in accordance with the teaching plan formulated by the standard dance special teacher, and no strength training for the lower body is arranged; The other group is the experimental group, in order to ensure the feasibility and validity of the experiment, under the premise of not affecting the normal class training, the content of lower body strength training should be added to the technical training class.The two groups of athletes maintained normal eating habits and work and rest patterns in daily life.Neither the experimental group nor the control group did any special lower body strength training.

Questionnaire survey
According to the research purpose and the needs of the research content, the questionnaire was designed by consulting relevant literature and interviewing relevant experts, after three rounds of repeated revision, deletion, addition and improvement, the questionnaire finally formed a formal questionnaire.In order to ensure the reliability and validity of the questionnaire, an expert reliability and validity test is carried out before the questionnaire is distributed, as shown in Figure 1 below.

Mathematical statistics
Statistical analysis was carried out on the data collected from the experiment through spss18.0,and an objective, accurate and scientific quantitative description of the data was made, and the difference in the impact of lower limb strength training on the special physical fitness of the standard dance option was found.The differences in the effects of different training methods between the two groups were analyzed, provide corresponding data support for the experimental results. 10

Figure 1 .
Figure 1.Statistical results of questionnaire survey distribution and recovery.

Table 1 .
List of characteristics of experimental objects (N=20).