两种疲劳方案对落地时下肢运动学和冲击力时频特征的影响

发布时间：2018-05-08 20:31

  本文选题：落地 + 疲劳　； 参考：《医用生物力学》2017年05期

【摘要】：目的比较两种疲劳方案对人体落地动作下肢关节运动学及冲击力时/频域特征的影响。方法选取15名优秀跑、跳类专项男性运动员,利用Vicon运动捕捉系统和Kistler三维测力台比较两种疲劳方案(恒速跑、折返跑+垂直纵跳)前后落地时矢、额状面运动学和地面反作用力(ground reaction force,GRF)时/频域特征。结果(1)两种疲劳方案均会造成髋、膝关节在矢状面上的角度减小、屈曲活动度增加,且采用跑+跳方案时踝关节屈曲活动度、膝关节最大屈曲角速度增加(P0.05),髋关节外展活动度以及髋、膝关节最大外展角速度增加(P0.05);(2)两种疲劳方案前后,冲击力时域特征均无显著差异;采用跑和跑+跳方案,分别在3.51、8.20 Hz及1.17、3.51、7.03 Hz下表现出GRF频谱振幅减小(P0.05)。结论两种疲劳方案均会导致下肢在受到落地冲击时更多采用屈曲着地方式,但跑+跳方案表现更明显且干预时间更短,从实验方法学角度更具优势。研究结果可为研究疲劳后的力特征提供进一步参考。
[Abstract]:Objective to compare the effects of two fatigue schemes on the kinematics of lower extremity joint and the time / frequency characteristics of impact force. Methods Fifteen male athletes with excellent running and jumping were selected to compare the two fatigue schemes (constant-speed running, reverse run, vertical vertical jump) with the Vicon motion capture system and the Kistler three-dimensional force table, and the time vectors before and after the landing were compared. Frontal surface kinematics and ground reaction force GRF) time / frequency domain characteristics. Results 1) both kinds of fatigue schemes could cause hip joint, the angle of knee joint on sagittal plane decreased, the flexion motion increased, and the ankle flexion motion was increased when running and jumping scheme was adopted. There was no significant difference in the time domain characteristics of impact force between the two groups before and after the maximum flexion angular velocity of knee joint increased (P 0.05), hip joint outreaching motion and hip joint, and knee joint maximal abduction angle velocity increasing (P 0.05). The time domain characteristics of impact force were not significantly different between the two schemes, running and jumping schemes were used, and there was no significant difference between them before and after fatigue. At 3.51 ~ 8.20 Hz and 1.17 ~ 3.51 ~ 7.03 Hz, respectively, the amplitude of GRF spectrum was decreased by P0.05. Conclusion both of the two fatigue schemes can lead to more flexion and landing of lower limbs when they are impacted by landing, but the performance of running and jumping scheme is more obvious and the intervention time is shorter, so it is more advantageous from the point of view of experimental methodology. The results can provide a further reference for the study of fatigue force characteristics.
【作者单位】： 上海体育学院运动健身科技省部共建教育部重点实验室;
【基金】：国家自然科学基金项目(11772201,11302131) 上海市教育委员会科研创新项目(14YZ125) 教育部博士点基金项目(20123156120003)
【分类号】：G804.6
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本文编号：1862971