Isokinetic muscle strength of the shoulder flexor and extensormuscles in adolescent softball players
Ma Tao
Gao Bing-hong
Abstract：BACKGROUND:The isokinetic muscle strength test system can quantitatively testtheshoulder flexor and extensormusclesand objectively analyze the relationship between size and balance of flexor and extensor.Therefore,itcould be used forstrength trainingmonitoringas wel asprediction and rehabilitation of sports injuries. OBJECTIVE:To understand shoulder flexor and extensor strength characteristics of adolescent softbal players, and find out shortcomings in the shoulder flexor and extensor strength to provide guidance for adolescent athletes’ strength trainingandpoint out possible sports injury risks caused by imbalanced strength. METHODS:ISOMED2000 isokinetic testing system(D&R,Germany)was employedto test theisokinetic strengthofshoulderflexor andextensor of12adolescentfemalesoftbal playersfromShanghaiSports University, China. RESULTS AND CONCLUSION:With the increase of test speed, the bilateral shoulder flexor and extensor peak torque, the flexor and extensor average power ratio,andthe flexor and extensor powers were reduced, but the flexor and extensor average power was on the rise. Under the same test speed,flexor and extensor peak torque, the flexor and extensor peak torque ratio, the flexor and extensor average power, the flexor and extensor average power ratio and the flexor powersof the throwing shoulderwere significantly larger thanthoseofthenon-throwingshoulder(P< 0.05), whiletheextensor peak torque and the extensor average powerof thethrowingand non-throwing shouldersshowedno significant differences (P> 0.05).Under the same test speed, bilateral shoulder homonymous flexor strength ratio was larger than that of the extensor, andthe extensor powerof the throwing shoulderwas less thanthatof the non-throwingshoulder.The ratio ofhomolateralshoulder flexor and extensor ranged from 70% to 80%. These results indicate that there is a significant difference betweentheflexor strength ofthebilateral shoulders inadolescent softbal players,but the bilateralextensor strengthis similar.Flexor fast strength and extensor maximum strengthof the throwing shoulderare lower. Besides, the isokinetic muscle strength test system canbe used toevaluate the flexor and extensor strengthinadolescent softbal athletes,based on whichcoachescangivetargetedstrength traininginadolescent softbal athletes.
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Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 3595-3601 )