The Research On Characteristics Of Hip And Knee Isokinetic Muscle Strength Of Some Chinese Snowboarding Half-pipe Elites

The isokinetic double hip and knee joint flexion and extension of16snowboardinghalf-pipe young athletes were measured in order to provide scientific data to probe into thepractical training level. The research was aimed at finding out the characteristics of lower limbsflexion and extension in snowboarding half-pipe young male and female athletes and thecorrelation between biomechanics feature and flexion and extension muscle strength and toprovide the data for sports training, selecting materials in a scientific way and rehabilitation.The peak torque, flexion/extension, peak torque/body weight, average power, range ofmotion, and the degree at peak torque of hip and knee joint at different speed were measured bythe German ISOMED2000isokinetic test system to12athletes, who have been training for morethan5years. And the correlation between isokinetic strength and sports ability of specializationwas analyzed. The thesis would enrich the mechanism of this event as well as the research theoryin power application, which would help coaches with making training plans, and help the athleteincrease the reserve of strength to enhance the training efficiency. The thesis would also promotethe development of snow sports.The results showed that: There weren’t significant differences between male and female’speak torque, and the female had larger range of joint motion; The results of extensor were greaterthan flexor, and the right side myodynamia was slightly greater than that of left side, whichindicated that after long-term specific training the main joint muscle groups of lower limbs ofhalf-pipe athletes were affected by the division work for the regular and back foot resulting inbetter for back foot than regular foot. However, there weren’t significant differences between theregular and back foot on hip joint testing, which indicated that it was more coordinating forflexor and extensor of hip joint, and the right and left side tended to balance. The average powerof half-pipe young athletes was on the rise with the test speed increasing from60°/s to120°/s, while on the decline with the test speed increasing from120°/s to180°/s. Therefore, it wasconcluded that there was the specific speed at which hip and knee joints were the most effectiveat the same velocity. The changes of half-pipe athletes’ peak torque in hip and knee joints were inaccord with the theory that is the tension of muscle is inverse to the velocity of the contraction ofmuscle. The extensor were greater than flexor, and the indexes of average power and the range ofjoint motion stood out, which fit the characteristics of specific skills.