等速离心训练对优势、劣势踝关节肌肉力量影响的研究
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摘要
[方法]实验法:实验对象共计30人,对照组10人,优势踝关节离心训练组10人,劣势踝关节离心训练组10人,其中离心训练采用同样的角速度60°/s。实验共进行8周,第1周主要测试学生训练前踝关节肌肉的最大力矩(PT)、总功(TW)等指标。首先,将仪器设置为向心收缩的模式,给受试者讲解测试的注意事项,使他们熟练掌握等速离心训练,在正式测试前运动员热身运动10分钟,然后正式测试5个来回60°/s的向心运动,要求受试者尽力完成测试,根据在60°/s向心测试时踝关节屈伸肌群最大力矩和总功的原始成绩随机分为三组(分组原则是根据统计学无差异性检验进行分组,各组测试数据间的独立样本检验均无显著性差异),训练前要充分做好学生的思想工作,使每位学生都能按照制定的训练计划进行训练。第2至第7周为训练周,每周训练3天,优势踝关节离心训练组在每周一、三、五下午3点进行,劣势踝关节离心训练组在每周二、四、六下午3点进行,随后各进行两天休息。接着开始训练,第2至第5周离心训练的阻力矩为最大向心力矩的150%,每次训练2轮,每轮2组,每组15次,组间休息15秒,一轮结束之后再进行下一轮的训练。第6、7两周每组训练次数增加到20次,力量增加至受试者最大向心力矩的180%进行离心训练,组间休息10秒,其它条件均不变。在第8周后测试记录训练之后踝关节肌肉的最大力矩、总功等指标。
     [结果]在最大力矩、总功方面,优势侧和劣势侧踝关节肌群进行60°/s离心训练后,以60°/s、120°/s、180°/s进行向心测定时在最大力矩、总功方面均显著高于实验前,表明离心训练效果显著,对照组没有参加离心训练,实验前后最大力矩、总功方面没有显著变化。在屈伸肌力比和屈伸肌总功比方面,实验前后优势侧和劣势侧的屈伸肌力比均出现不同程度下降。在原地深蹲纵跳方面,训练组实验后跳跃高度均显著性高于实验前,劣势侧经离心训练后的纵跳效果更为显著。
     [结论]
     (1)6周离心训练对提高运动员的踝关节屈伸肌群肌肉力量有显著作用,训练组踝关节优势侧和劣势侧屈伸肌实验后在最大力矩和总功方面均有显著增加,表明离心训练的确是一种行之有效的力量训练方式。
     (2)选择测定的离心角速度不同,最大力矩和总功效果也不同,训练组和对照组优势侧和劣势侧屈伸肌最大力矩和总功均呈现出60°/s>120°/s>180°/s的趋势,表明慢速离心测试能够表现肌肉的最大力量。
     (3)经过6周离心训练后,两组训练组受试者在原地深蹲纵跳测定中,实验后的跳跃高度比实验前均有显著性增高,反映出60°/s的离心训练在改善原地纵跳能力方面有明显效果。
     (4)6周踝关节优势侧和劣势侧屈伸肌离心训练后,训练组优势侧和劣势侧屈伸肌力比和总功比试验后均呈现出低于实验前的趋势,表明踝关节屈伸肌经过离心训练后,伸肌肌力增长的更快,屈肌和伸肌经过离心训练后反差会减小,这种反差减小会使屈伸肌力更加均衡,也更能防止弱侧的肌肉出现拉伤。
[Method]There are altogether 30 objects of experiment,among them 10 objects are in control group,10 in superior ankle joint experimental group and 10 in inferior ankle joint experimental group.The eccentric training is taken in the same angular velocity-60°/s.The experiment goes on for 8 weeks.In the first week,the PT and TW of ankle joint muscle of the objects are measured before the experiment.At first the experimental is set in the model of concentric contraction and then the experimenter asks the objects get familiar with isokinetic eccentric training by telling them.Some special things they should pay attention to. Before the formal experiment,the objects are asked to do the warming-up exercises for 10 minutes,and then take eccentric training of 60°/s for 5 turns.All the objects are required to try their best to persist until the end of the experiment.Before the experiment the objects are asked to be well-prepared and try their best to finish the training according to the training plan.The objects are trained from the second to seventh weeks, three days a week.The objects in superior ankle joint experimental group are trained at 3 o'clock every Monday,Wednesday and Friday and the objects in inferior ankle joint experimental group are trained at 3 o'clock every Tuesday,Thursday and Saturday,then both groups are allowed to rest for 2 days.From the 2~(nd) to the 5~(th) week of the training the resisting moment of the eccentric training is 150%of the TW.Every set of training has 2 rounds(2 turns each round,15 times each turn and 15 seconds for a break).The next round of training does not start until the end of the first round of training.In the 6~(th) and 7~(th) week the frequency of the training is increased to 20 times each turn.The TW of the objects is increased to 180%.8 weeks after the training the PT and TW of ankle joint muscle of the objects are recorded.
     [Result]After 60°/s eccentric training,both the superior ankle joint muscle groups and the inferior ankle joint muscle groups are improved greatly on the sides of PT and TW.It shows that eccentric training is very effective whereas the control group has little change because the objects in this group don't accepted eccentric training.The ratio of the power of flexor and extensor on both superior side and inferior side has decreased in different degrees.After the training,the objects in experimental group can jump much higher especially their inferior side are improved greatly.
     [Conclusion]
     (1) The 6 week's eccentric training has a very effective effect on strengthening the subjects' flexor and extensor on their ankle joints.The flexor and extensor of the subjects in the experimental group on the ankle joints of both superior side and inferior side are strengthened dramatically on PT and TW.It shows the eccentric training is really a very effective training method.
     (2) PT and TW are quite different because of different eccentric angular velocity.For the experimental group and the control group,PT and TW of flexor and extensor on superior side and inferior side tend to be:60°/s>120°/s>180°/s.It is proved that the greatest strength can be reflected in slow eccentric training.
     (3)After 6 week's eccentric training,the subjects in both groups can jump much higher in different degrees.It shows 60°/s eccentric train is very effective in improving the ability of jumping upward.
     (4) After 6 week's eccentric training,the ratio of the power of flexor and extensor on both superior and inferior side has decreased.It shows after the eccentric training the extensor of ankle joints become more powerful and difference between the flexor and extensor is narrowed which helps keeping the balance of flexor and extensor and prevents the muscle on the inferior side from being damaged.
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