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目的:通过对9～20岁男生双侧膝关节进行等动肌力测试,探讨青少年膝关节屈伸肌群力量发育特征。方法:运用Kinitech等动测力系统对研究对象双侧膝关节进行60°/s、120°/s、240°/s三种速度的测试。结果:青少年男子膝关节屈伸肌PT值随年龄的增大而增大,不存在某个年龄段快速增长的现象,在同一年龄膝关节屈伸肌PT值均随测试速度的增加而减小;相同年龄男生比较,在同一速度下同侧屈伸肌有较大差异,且在各年龄段伸肌的PT值均大于屈肌,在60°/s下,差异在9～14岁有显著性(P<0.05),在15～20岁有高度显著性(P<0.01),在120°/s测试条件下,左侧差异在14～20岁表现出显著性,右侧差异在15～20岁表现出显著性;同一测试速度下同年龄异侧同名肌比较差异均无显著性;在同一测试速度下,H/Q值随年龄的增加显示出减小的趋势;同年龄段男生的H/Q值随速度的增加逐渐增大。结论:9～20岁男子膝关节屈伸肌群力量均随年龄的增大而增大,但表现出随年龄增长屈伸肌力比H/Q值呈递减的趋势,形成随年龄增大屈伸肌群力量差距增大的现象。
OBJECTIVE: To evaluate the strength development of the flexors and extensors of the knee joint in young people by measuring the isokinetic strength of bilateral knee joints in boys aged 9-20 years. Methods: Kinitech and other dynamic force measuring system were used to test the bilateral knee joint at 60 ° / s, 120 ° / s and 240 ° / s. Results: The PT of knee joint flexors and extensors of adolescent boys increased with age, and there was no phenomenon of rapid growth in one age group. The PT of knee flexors and extensors decreased at the same age with the increase of test speed. The boys at the same age had greater differences in ipsilateral flexors and extensors at same speed, and the PT values of extensors in all ages were greater than those in flexors. The differences were significant at 9 to 14 years at 60 ° / s (P (P <0.01). Under the condition of 120 ° / s test, the difference of the left side was significant between the ages of 14 and 20 years, and the difference of the right side was between 15 and 20 years The same test speed at the same age with the same side of the same name muscle was no significant difference; at the same test speed, H / Q value with age showed a decreasing trend; same age boys H / Q The value increases with increasing speed. CONCLUSION: The strength of knee flexors and extensors of 9-20 years old men increases with age, but shows a tendency of flexor-extensor muscle strength decreasing with H / Q ratio as the age increases, forming flexor-extensor muscles group with age The gap between the strength of the phenomenon.