Ballistic movement performance in karate athletes.
Ballistic movement performance in karate athletes.
复制标题
空手道运动员的弹道运动表现。
DOI：
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发表时间：
1997
影响因子：
4.1
通讯作者：
J. Dowling
中科院分区：
文献类型：
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作者：
E. Zehr;D. Sale;J. Dowling
9名男子空手道运动员和13名未经训练的男子进行了最大自主等距（MVC）和弹道肘伸动作，后者卸载（L0）并承受等于10% MVC （L10）的负荷。空手道组L0（30%）和L10（40%）的等距扭矩（32%）和弹道动作峰值扭矩（P < 0.05）更高。当弹道动作与等距动作的比例为L10时，空手道组的峰值扭矩增加了13%，这表明了特定负荷的训练适应。L0组间相应比例无显著差异。空手道组L0和L10的弹道动作峰值扭矩发展率（51%、51%）和峰值加速度（15%、9%）分别大于空手道组。而两组间的峰值速度和运动时间差异不显著。在等长运动和弹道运动中，对激动剂肱三头肌和拮抗剂肱二头肌进行肌电图记录。由于弹道动作（L10）是从预加载状态开始的，因此监测了预运动激动剂抑制的发生和持续时间。在弹道动作中，在激动剂激活、弹道动作与等距动作激动剂激活或拮抗剂共激活的比率方面没有组间差异。运动前激动剂抑郁在两组中都很少发生，没有组间差异。由此得出结论，空手道运动员肘关节伸展弹道性能增强，但这与激动剂激活放大、拮抗剂激活改变或激动剂运动前抑制更频繁发生无关。
Nine male karate athletes and 13 untrained men did maximal voluntary isometric (MVC) and ballistic elbow extension actions, the latter unloaded (L0) and against a load equal to 10% MVC (L10). The karate group achieved greater (P < 0.05) isometric (32%) and ballistic action peak torque with L0 (30%) and L10 (40%). With L10 the ratio of ballistic action to isometric action, peak torque was 13% greater in the karate group, indicating a load specific training adaptation. With L0 the corresponding ratio did not differ significantly between groups. Ballistic action peak rate of torque development (51%, 51%) and peak acceleration (15%, 9%) with L0 and L10, respectively, were greater in the karate group. In contrast, peak velocity and movement time did not differ significantly between groups. Electromyographic recordings of agonist triceps and antagonist biceps were made during the isometric and ballistic actions. Since ballistic actions (L10) were initiated from a preloaded condition, the occurrence and duration of premovement agonist depression were monitored. In ballistic actions there were no group differences in agonist activation, the ratio of ballistic to isometric action agonist activation, or antagonist coactivation. Premovement agonist depression occurred infrequently in both groups, with no group differences. It is concluded that karate athletes have enhanced elbow extension ballistic performance, but it could not be related to amplified agonist activation, altered antagonist activation, or more frequent occurrence of agonist premovement depression.