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安排9名有一定训练的青少年运动员参加10周举重训练。每周6次,每次8小时。训练前后用电子计算机—X线断层扫描技术(CT)测量大腿肌肉横断面积,股外肌针刺活检取样测定Ⅰ、Ⅱ型肌纤维％和面积。测定大腿伸膝肌最大随意等长力量。将结果(实验前、后)与对照组(13名无训练者)和优秀举重运动员(健将3人、一级4人)进行比较。结果表明,有训练人(实验前、后和优秀)与没有训练人(对照)在肌比力上存有差别。短、长期举重训练后,肌比力与Ⅱ型肌纤维％呈正相关。短、长期举重训练不曾改变肌纤维类型分布。举重训练对Ⅱ型肌纤维有选择性作用,且这个作用不受年龄的影响。结果还提示,肌比力的变化及肌比力与肌纤维之间的关系都会受运动项目专项特点的影响。
Arrange for a group of nine young athletes with certain training to participate in 10-week weight training. 6 times a week, every 8 hours. Before and after training, computerized tomography (CT) was used to measure the cross-sectional area of thigh muscles. Acupuncture biopsy samples of femoral muscle were used to determine the percentage and area of type Ⅰ and Ⅱ myofibers. Determination of maximum knee extensor muscle equal isometric strength. The results (before and after the experiment) were compared with those of the control group (13 non-trainers) and elite weightlifters (3 athletes and 4 at the first level). The results showed that there was a difference in muscle tone between trained (pre-test, post-test and excellent) and no-trained (control) subjects. Short and long-term weight training, muscle strength and type Ⅱ muscle fibers were positively correlated. Short, long-term weight training did not change the type of muscle fiber distribution. Weight training has a selective effect on type II muscle fibers, and this effect is not affected by age. The results also suggest that changes in muscle tone and the relationship between muscle strength and muscle fibers will be subject to the special characteristics of sports events.