發(fā)布時間：2018-05-08 20:31

  本文選題：落地 + 疲勞��； 參考：《醫(yī)用生物力學(xué)》2017年05期

【摘要】：目的比較兩種疲勞方案對人體落地動作下肢關(guān)節(jié)運動學(xué)及沖擊力時/頻域特征的影響。方法選取15名優(yōu)秀跑、跳類專項男性運動員,利用Vicon運動捕捉系統(tǒng)和Kistler三維測力臺比較兩種疲勞方案(恒速跑、折返跑+垂直縱跳)前后落地時矢、額狀面運動學(xué)和地面反作用力(ground reaction force,GRF)時/頻域特征。結(jié)果(1)兩種疲勞方案均會造成髖、膝關(guān)節(jié)在矢狀面上的角度減小、屈曲活動度增加,且采用跑+跳方案時踝關(guān)節(jié)屈曲活動度、膝關(guān)節(jié)最大屈曲角速度增加(P0.05),髖關(guān)節(jié)外展活動度以及髖、膝關(guān)節(jié)最大外展角速度增加(P0.05);(2)兩種疲勞方案前后,沖擊力時域特征均無顯著差異;采用跑和跑+跳方案,分別在3.51、8.20 Hz及1.17、3.51、7.03 Hz下表現(xiàn)出GRF頻譜振幅減小(P0.05)。結(jié)論兩種疲勞方案均會導(dǎo)致下肢在受到落地沖擊時更多采用屈曲著地方式,但跑+跳方案表現(xiàn)更明顯且干預(yù)時間更短,從實驗方法學(xué)角度更具優(yōu)勢。研究結(jié)果可為研究疲勞后的力特征提供進一步參考。
[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.
【作者單位】： 上海體育學(xué)院運動健身科技省部共建教育部重點實驗室;
【基金】：國家自然科學(xué)基金項目(11772201,11302131) 上海市教育委員會科研創(chuàng)新項目(14YZ125) 教育部博士點基金項目(20123156120003)
【分類號】：G804.6
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本文編號：1862971