Study On The Correlation Between The Characteristics Of Major Joints' Muscle Group Strength And Swimming-forward Ability Of Elite Liaoning Male Short-distance Freestyle Stroke Athletes

In this thesis,based on a test about the major muscle force of trunk,shoulders and knee joints of outstanding Liaoning men's short distance freestyle athletes,the researcher analyzed their strength characteristics in accordance with the technical characteristics of freestyle,dissected the main problem existing in developing athlete's major joints' muscle strength,and worked on the correlation between athletes' swimming-forward abilities and their major joints' muscle strength characteristics by statistical methods,hoping to find out the main muscle strength indicator that affects swimmer's performance in Liaoning's freestyle physical training,which would provide coaches theoretical references and help them in designing scientific training method and specific strength training for athletes.In this thesis,based on literature analysis,the researcher conducted an isokinetic muscle test on 10 outstanding Liaoning male short-distance freestyle sprint swimmers,and made a 100 m freestyle field test on them in the same period.The researcher then set up a database with the statistics of related researches,discussed the correlation between the main muscle strength characteristics and the swimming-forward ability of the athletes with mathematical statistics and logical analysis.Results: 1.The athletes' muscle strength of major joints: the slow-twitch muscles are better than the fast-twitch muscles,the extensor groups are better than the flexor groups,the right side is better than the left side.2.Some indicators such as the peak torque,the peak torque's angle,the peak torque per unit of weight,the total energy per unit of weight of athletes' trunk,shoulder,hip and knee joints are different,but their values show a gradual decrease along with the increase of speed.3.There are differences between the average power of shoulder,hip and knee joints,where the parameter values are increasing with the speed.And there are also differences between the ranges of motion of shoulder joint in ipsilateral movement at the same speed and heterolateral movement at the same speed,and the ranges of motion of knee joint in ipsilateral movement at the same speed.4.There are 18 indicators of the athletes' major joint muscle strength characteristics in total that suggest a significant correlation with the swimmers' swimming-forward abilities: the trunk has 5,the shoulder joints have 3,the hip joint has 5,and the knee joints have 5.Conclusions: 1.The accelerating capacity of fast-twitch extensor muscles on the subjects' trunk is weak,the peak torque of trunk muscle increases with the test speed,and the peak torques of shoulder,hip and knee joints muscles decrease with the increase of test speed,and the data of hip and knee joints show a more obvious decrease.2.The muscle strength of the two sides of the subjects' shoulder,hip and knee joints are imbalanced.3.The strength performances and joint flexibility of the subjects' major joints related to technical movements are weak.Suggestions: 1.Athletes should pay attention to a reasonable control of weight and a balanced muscle strength development in daily training,improving the strength of fast flexor and extensor muscles under a moderate increase of speed.2.Athletes should emphasize on the training of the "core" power of trunk and give the major muscle groups a systematic and specialized training,for the major muscle groups are the key to forward swimming ability.3.Athletes should pay attention to the training of coordination and rhythm of the movements.4.Keeping muscles stretched and relaxed in daily training is the key to increasing movement range,and relaxation can effectively avoid an overstrained start and running out of energy quickly in a race.