Isokinetic muscle strength characteristics of the main joints in juvenile male gymnasts

Ju Xiu-kui

doi:10.3969/j.issn.2095-4344.2016.46.011

Abstract：BACKGROUND:The gymnastic skil training of juveniles tends to be scientific and systematic, such as confirming the strength characteristics of joints and muscles and implementing training program pertinently based on the scientific diagnostic method. OBJECTIVE:To explore the isokinetic muscle strength characteristics of the trunk, hips and knees in juvenile male gymnasts. METHODS:Sixteen juvenile male gymnasts who were active athletes in Liaoning province were enrol ed. ISOMED2000 isokinetic muscle strength test system was used to detect the muscle strength, and the test speed of trunk set as 30, 60 and 180 (°)/s, while 60, 180 and 300 (°)/s for the hips and knees. RESULTS AND CONCLUSION:At 30, 60 and 180 (°)/s, the hamstring/quadriceps ratio of trunk were 91.36±1.25, 87.77±3.74 and 78.20±4.70, respectively. At 60, 180 and 300 (°)/s, the hamstring/quadriceps ratio of the left hip was 65.55±4.38, 66.92±3.22 and 68.18±2.82, while that of the right hip were 57.40±4.43, 65.73±1.07 and 64.15±5.55. Additional y, the left flexor strength was significantly higher than that of the right, while the right extensor strength was significantly higher than that of the left at 60 (°)/s (P<0.05). At 60, 180 and 300 (°)/s, the hamstring/quadriceps ratio was 50.88±4.98, 54.75±4.51 and 58.80±7.93 for the left knee, and 51.55±4.30, 55.20±5.08 and 58.43±5.93 for the right knee. In three test speeds there were no significant differences in flexor and extensor strength between two sides (P>0.05). These results indicate that the rapid strength of the back especial y of the flexor is insufficient markedly, and the basic strength of the extensor is weak. The basic strength of the left flexor in the hip is large, the same as the right extensor;the rapid strength of flexor is weak, and imbalance in the muscle strength between two sides appears. Fortunately, the muscle strength of the knee between two sides achieves balance, but there is stil a certain deficiency in the rapid strength of the left flexor and the basic strength of the extensor on both sides.