A STUDY ON THE EFFECTIVENESS OF MUSCLE STRENGTH GAIN TRAINING IN RUNNING ATHLETES

ABSTRACT Introduction: Muscle strength training can increase the strength of the phasic muscles, aiding in balance and body stability. Running is a physical-dominant speed sport where strength-speed is two crucial quality in the athletic training of its practitioners. It is believed that training muscle strength at high-intensity intervals can increase athletic speed performance. However, there is no determinant point to determine the peak of this relationship. Objective: The purpose of this study is to examine the effect of high-intensity interval muscular strength training on the physical conditioning of athletes. This paper also examines the relationship between muscular strength training and performance training in sprinters. Methods: Twenty sprinter volunteers were randomly selected as research subjects, divided without discrepancies into control and experimental groups, with ten people each. Mathematical statistics were used to analyze the physiological indicators of the subjects before and after muscle strength training. At the same time, the statistical correlation method was applied to analyze the performance changes of athletes before and after the exercise cycle. Results: After muscle strength training, the athletes in the experimental group were better than those before the training. The data were statistically significant (P<0.05). Conclusion: Muscle strength training can promote the physical conditioning of sprinters. At the same time, the training mode can also improve the athlete’s performance. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.


INTRODUCTION
Core strength training is a training method introduced from rehabilitation to sports in our country.Especially in recent years, theoretical research on sports training has advanced by leaps and bounds, and core strength training has been rapidly applied to various sports.Researchers have found that almost all sports are based on the core muscle group in the center of the human trunk as the human body's kinematic chain.The human body stabilizes posture through the action of core strength. 1At the same time, core strength training can improve motor skills and special skills.Only in this way can exercise create good sports performance.When we compare the characteristics of physical fitness training of modern and traditional printers, we can find that the traditional sprint training process attaches great importance to the training of limb muscle groups.But athletes often ignore or don't train core muscles.This results in a prolonged improvement in the performance of the athlete.We found that sprinting requires exceptionally high core muscle groups from sports training.Athletes need core muscles to control body posture, movement posture and maintain the stability of specific techniques.This will get better results.
Modern core strength training complements traditional sprinting fitness training.It is also the primary trending method for training now and in the future.In this study, the core strength training theory was introduced into the special strength training of sprinting for middle school students according to the characteristics of sprinting. 2This study aims to explore a systematic core practice method suitable for sprinters.This can help middle school sprinters fully understand core strength and make reasonable use of core strength.Athletes can use the most direct and effective training methods to improve the ability to synergize force.This way, the athlete's strength, and technical potential can be fully utilized.

METHOD Research objects
In this paper, 30 male sprinters in the youth palace were selected as the test subjects of this study. 3The above athletes all have a history of lumbar, spine, hip, and knee injuries.The mean age of the tested sprinters was 14.2±1.4years.The average time spent in special training was 1.3±0.5 years.We randomly divided the test subjects into a control group and an experimental group, with ten people in each group.Statistical analysis of the two groups of volunteers before the experiment found no significant difference in their strength.(Table 1)

Documentation method
This article examines theoretical and practical material on sprinting, core strength training, and research related to teaching and training published over nearly ten years.We understand related theories' research status and development trends. 4These data provide specific materials and basis for this study to determine the research direction, formulate the research plan design, and the overall structure of the thesis.

Experimental method
The athlete uses only the mat for the first phase of core strength training.This exercise stage aims to let the athlete experience the feeling of muscle force during core strength training. 5Athletes learn and master the technical essentials of core strength training.At the same time, it improves the functional state of athletes' core muscles, ligaments, joints, and tendons.
Exercise load: 5 or more training methods are arranged in each session. 6We arrange each exercise for 30~60s according to the difference in the difficulty of the movements.The ratio of practice time to rest time is 1:2.The rest between groups is 2 to 3 times the rest between groups.
The second stage is 7-12 weeks.Train 2 times a week.Each training time is about half an hour.
Exercise load: More than five training methods are arranged in each training session, and each exercise is trained in 4 groups.We arrange each exercise for 30~60s according to the difficulty of the movement. 7he ratio of practice time to rest time is 1:2.The rest between groups is 2 to 3 times the rest between groups.
The training regimen for the control group:

Mathematical Statistics
We perform statistical analysis on the data of the pre-experiment and post-experiment tests. 9In this way, the influence of core strength training on the technical performance of technical cheerleading was explored.

Variational Athlete Sprint Model
It is assumed that the impulse f(t) that the athlete can exert after overcoming the physiological limitation satisfies . k is the impulse limiting factor.f (0) = F is the maximum impulse. 10We need to find expressions for the maximum sprint speed v (t) and the maximum sprint distance D during sprinting.Suppose the known function F (x, y, y) is differentiable and continuous.Solving the function y = y(x) maximizes or minimizes the functional (1).

[ ( )] ( , ( ), ( )) J y x F x y x y x dx
Let v(t), D and [0,T] denote the running speed, distance and period of the athlete, respectively.The relationship between the three is 0 ( ) The problem in sprinting is to arrange the speed v(t) of the athlete in the whole process so that the time T used is the least when the distance D is constant.The dual problem is to arrange x(t) to maximize the distance D when the time T is constant.Here, the variational method is used to solve the dual problem.The running speed v(t) of the athlete is limited by the athlete's physical strength and the frictional resistance during the race. 11Assuming that the speed is proportional to the frictional resistance, the proportionality coefficient is τ -1 .The athlete's momentum is used to overcome resistance and generate acceleration in the forward direction.We assume that the weight of the athlete is m = 1.

The first stage
This is the initial stage of the sprint.The athlete runs forward with maximum momentum.The speed must satisfy . The maximum sprint speed in the initial stage of the sprint competition is solved as The maximum sprint distance is t 1 is the duration of sprinting with maximum force.Substitute (4) into (5) to get: If (σ -F2 τ) > 0, then E(t) → +ꝏ is impossible when t → +ꝏ.Derive the above formula ( ) ( ) The best performance is achieved if the athlete can run with maximum effort throughout the entire process. 12Determine the maximum speed of the athlete at time t 1 at time t 1 (0 < t ≤ t 1 < T).The athlete runs with maximum momentum during the time [0, t 1 ].The determination of t 1 is left to the next stage of the calculation.

The second stage
Athletes overcome physical limitations in this phase.The impulse satisfies , and the solution is f (t) = C 0 e k .This is a conditional extremum problem, that is, to find the extremum of functional (1)   under condition (2).Let . The problem is transformed into a system of differential equations Solve that the maximum sprint speed in the second stage of the sprint competition is 2 0 ( ) . Because sprinting is an oxygen-deficient sport, the moment when the athlete overcomes physical limitations is the critical point between the two phases.
. Substitute into (4) to solve . The maximum sprint distance at this time is And from f(t 1 ) = F, v 2 (t 1 ) = v 1 (t 1 ), we can get: . Substitute C 0 , C into the above calculation formula of speed and distance to get the final result.
There is no need for a code of ethics for this type of study.

RESULTS
After 12 weeks of traditional strength training in the control group, all three indicators tested improved to some extent.And the performance of the experimental group was significantly better than that of the control group (P < 0.05).The experimental group where the youth palace sprint student-athletes belonged implemented core strength training.Because of core strength training, the sprinter' s ability to rebuild quickly is enhanced.(Table 2)

DISCUSSION
The experimental group can effectively improve the stability of the core muscle group of middle school student sprinters under the effect of this training program.The strength of the abdominal, hip, and abdominal muscle groups and the deep small muscle group of middle school sprinters guarantees the athlete's stability.The athlete is in a constant principle state during running.An athlete's lower extremity produces a forward rotational moment while necessarily producing a rotational moment opposite.This is how to achieve balance.The experimental group of sprint student-athletes improved their physical fitness by using the unstable training method of the equipment.This has played a perfect role in promoting the power transmission effect of the dynamic movements of the sprint student-athletes.
The control group used traditional strength training.Athletes use barbells, dumbbells, kettlebells, combination training equipment, and freehand strength training for strength training.The training schedule is divided into 3 phases.The preparation period is 1 to 4 weeks.The muscle strength and coordination training phase are 5 to 8 weeks.The muscle power and endurance training phase are 9 to 12 weeks.The strength training program should be changed every few weeks to improve performance. 8We arrange the strength training program in reasonable stages during the ten weeks of training.The initial training should be non-specific strength training and then gradually turn to special training. 0

Table 1 .
The speed index change table of the experimental group and the control group before the experiment (unit: s) n=30.

Table 2 .
Changes in the speed index of the experimental group and the control group after the experiment.