Effect of exhaustive stretch-shortening cycle (SSC) exercise on the Education, Associate Professor

力竭拉伸缩短循环（SSC）运动对教育的影响，副教授

• 批准号: 10680019
• 负责人: HORITA Tomoki
• 金额: $ 1.79万
• 依托单位: TOYAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10680019/
• 关键词: Stretch-shortening cycle; Muscle damage; Fatigue; Motor control; 伸張-短縮サイクル

The purpose of the present project was to investigate the mechanisms of the stretch-shortening cycle (SSC) fatigue effect on the drop jump performance with respect to the delayed onset of the muscle damage and motor control of drop jump. The healthy male subjects performed exhaustive repeated SSC exercises until exhaustion. Drop jump (DJ) tests were performed before and after exercise as well as 2 days and 4 days after the exercise. Blood samples were taken to analyze creatine kinase (CK) activity for evaluating the delayed muscle damage. Kinetic and kinematic analysis were performed during DJ with respect to stiffness and power regulation. Electromyographic (EMG) activities were also analyzed for evaluate neural activities of the muscles. Exhaustive SSC exercise induced specific long lasting fatigue effect on the DJ performance as compared to the squat jump. Changes in DJ performance after SSC exercise showed bimodal pattern which consists of initial and subsequent delayed decline on … More 2 days after the exercise. Subjects who showed greater initial decline also indicated acute recovery 2 hours after the exercise. However these subjects showed secondary decline in DJ performance 2 days after the exercise. Interrelationships were found between the modulations of pre-landing joint kinematics, decreased stiffness and decreased performance in DJ on 2 days after the exercise. Blood CK activities showed delayed increase 2 days after the exercise which indicates possible muscle damage accompanied with muscle pain. Therefore, it has been suggested that the damage inducing pain could affect pre-landing joint movement. Delayed decrease in pre-landing EMG activities 2 days after exercise also suggest the possible modulation of pre-landing motor control and/or strategy which would be affected by delayed muscle damage and pain. In conclusion, it has been considered that the exhaustive repeated SSC exercise induced specific fatigue effect on the jumping activities accompanied with the delayed muscle damage as well as altered motor control strategy of jumping. Less

本项目的目的是研究拉伸-缩短循环（SSC）疲劳对跳伞性能的影响机制，涉及肌肉损伤的延迟发生和跳伞的运动控制。健康男性受试者进行详尽的重复 SSC 练习，直至精疲力竭。在运动前、运动后以及运动后2天和4天进行落跳（DJ）测试。采集血样来分析肌酸激酶（CK）活性，以评估延迟性肌肉损伤。在 DJ 期间进行了关于刚度和功率调节的动力学和运动学分析。还分析肌电图（EMG）活动以评估肌肉的神经活动。与深蹲跳相比，力竭的 SSC 运动会对 DJ 表现产生特定的长期疲劳影响。 SSC 锻炼后 DJ 表现的变化呈现出双峰模式，其中包括锻炼后 2 天的初始下降和随后的延迟下降。最初表现出较大下降的受试者在运动后 2 小时也表现出急性恢复。然而，这些受试者在锻炼后 2 天表现出 DJ 表现的二次下降。训练后 2 天，DJ 的着陆前关节运动学调节、刚度下降和表现下降之间存在相互关系。运动后2天血CK活性呈延迟增加，表明可能存在肌肉损伤并伴有肌肉疼痛。因此，有人认为引起疼痛的损伤可能会影响着陆前的关节运动。运动后 2 天着陆前肌电图活动延迟减少也表明着陆前运动控制和/或策略可能受到延迟肌肉损伤和疼痛的影响。总之，我们认为，反复的力竭SSC运动对跳跃活动产生了特定的疲劳效应，并伴有延迟性肌肉损伤以及跳跃运动控制策略的改变。较少的

项目成果

T. Horita et al.: "Effect of exhausting stretch-shortening cycle exercise on the time course of mechanical behaviour in the drop jump : possible role of muscle damage."European Journal of Applied Physiology. vol 79. 160-167 (1999)

T. Horita 等人：“精疲力竭的拉伸-缩短循环运动对跳伞机械行为时间过程的影响：肌肉损伤的可能作用。”《欧洲应用生理学杂志》。

T.Horita: "Effect of exhausting stretch-shorteing cycle exercise on the time course of mechanical behaviour in the drop jump:possible role of muscle damage." European journal of Applied Physiology. 79巻. 160-167 (1999)

T.Horita：“筋疲力尽的拉伸-缩短循环运动对跳伞机械行为时间过程的影响：肌肉损伤的可能作用”，《欧洲应用生理学杂志》，第 79 卷，160-167（1999 年）。