mba論文疲勞對籃球運動員完成急停跳投動作下肢運動模式的影響pdf

1、 IV 疲勞對籃球運動員完成急停跳投動作下肢運動模式的影響論文隨機驗證編號：BT42942044270摘要 摘要 研究目的：通過對比籃球運動員疲勞前后急停跳投動作，分析疲勞對運動員完成急停跳投動作時下肢生物力學(xué)特征的影響。旨在探究疲勞對于運動員運動表現(xiàn)和下肢運動損傷的影響，為籃球?qū)ｍ楏w能訓(xùn)練動作設(shè)計和訓(xùn)練計劃的制定提供理論依據(jù)。 研究方法： 受試者為北京體育大學(xué)男子籃球運動員 10 名。 實驗采用跑-跳結(jié)合疲勞模型制造疲勞。使用紅外高速

2、運動捕捉系統(tǒng)（Motion Analysis Raptor-4，200Hz）與三維測力臺（Kistler 9281CA，1000Hz） ，同步采集疲勞前后完成急停跳投動作時的運動學(xué)和動力學(xué)數(shù)據(jù)。 研究結(jié)果：起跳階段，疲勞后膝關(guān)節(jié)離地時刻屈曲角小于疲勞前，疲勞后踝關(guān)節(jié)蹬伸時間大于疲勞前，蹬伸速度小于疲勞前，垂直方向蹬伸沖量小于疲勞前 （p<0.05） 。 騰空階段， 落地前 100ms 時刻疲勞后髖關(guān)節(jié)屈曲角大于疲勞前，膝關(guān)節(jié)內(nèi)收角

3、小于疲勞前， 踝關(guān)節(jié)跖屈角、 內(nèi)翻角、 外旋角均大于疲勞前 （p<0.05） 。落地階段，落地后垂直地面反作用力第二峰值力疲勞前大于疲勞后，垂直地面反作用力第二峰值力平均加載率疲勞前大于疲勞后，垂直地面反作用力第二峰值力加載率峰值疲勞前大于疲勞后（p<0.05） 。觸地時刻膝關(guān)節(jié)內(nèi)收角小于疲勞前，踝關(guān)節(jié)內(nèi)翻角和外旋角大于疲勞前（p<0.05） 。踝關(guān)節(jié)背屈角峰值和最大運動幅度小于疲勞前，踝關(guān)節(jié)外旋最大運動幅度小于疲勞前

4、，踝關(guān)節(jié)背曲角速度和外旋角速度小于疲勞前（p<0.05） 。落地后髖關(guān)節(jié)內(nèi)收力矩峰值疲勞后小于疲勞前，膝關(guān)節(jié)伸展力矩峰值疲勞后小于疲勞前，膝關(guān)節(jié)內(nèi)收力矩峰值疲勞后小于疲勞前，踝關(guān)節(jié)外旋力矩峰值疲勞后小于疲勞前（p<0.05） 。 研究結(jié)論：急停階段，疲勞前后各生物力學(xué)指標(biāo)并未發(fā)生改變，說明疲勞不會改變急停運動模式。起跳階段，疲勞后較疲勞前膝關(guān)節(jié)離地時刻屈曲角度減小，踝關(guān)節(jié)蹬伸速度較小。整個蹬伸階段踝關(guān)節(jié)蹬伸時間延長，地面反作

5、用力垂直沖量減小，運動表現(xiàn)降低。落地前踝關(guān)節(jié)內(nèi)翻角和外旋角增大，并且觸地時刻踝關(guān)節(jié)內(nèi)翻角和外旋角度增加，提示了神經(jīng)肌肉控制的改變，增加了踝關(guān)節(jié)內(nèi)翻損傷風(fēng)險。落地階段，疲勞后較疲勞前垂直地面反作用力第二峰值力和加載率均減小。落地階段，疲勞后較疲勞前踝關(guān)節(jié)背曲角峰值、幅度、角速VI 疲勞對籃球運動員完成急停跳投動作下肢運動模式的影響論文隨機驗證編號：BT42942044270ABSTRACT Objective: The purpose o

6、f this study was to investigate the lower extremity kinetics and kinematics changes during stop-jump tasks between pre-fatigue and post-fatigue.To determine whether fatigue is a risk factor in lower extremity injuries. M

7、ethods: Subjects were 10 male basketball athletes from Beijing Sports University.Three-dimensional videography（Motion Analysis Raptor-4，200Hz）and force plate data（Kistler 9281CA，1000Hz）were collected for athletes perform

8、ing 3 stop-jump tasks before and after completing a run-jump fatigue protocol. Results: During jump stage, knee flexion angle was less than prefatigue in contact phase, ankle stretching time was greater than prefatigue,

9、ankle stretching velocity was less than prefatigue, vertical stretching impulse was less than prefatigue（p<0.05）. During pre-contact phase, hip flexion angle ,ankle planter flexion angle,ankle inversion angle,ankle pr

10、onation angle were all rised than prefatigue, Besides, knee adduction angle were less than prefatigue（p<0.05）.Landing phase, second peak vertical ground reaction force , average loading rate and peak average loading r

11、ate were greater than prefatigue（p<0.05）. Besides, knee adduction angle were less than prefatigue in pre-contact phase. Ankle planter flexion angle and pronation angle were rised than prefatigue in contact phase（p<

12、0.05）. Peak ankle planter flexion angle,peak ankle planter flexion angular velocity,peak ankle pronation angular velocity ,the ROM of ankle planter flexion angle and the ROM of ankle pronation angle were less than prefat

13、igue in post- contact phase（p<0.05）.Peak hip adduction torque , peak knee extend and adduction torque , peak ankle external rotation torque were less than prefatigue（p<0.05）. Conclusions: Fatigue altered locomotor

14、 performance by changing the lower extremity kinetics and kinematics features. Fatigue might not increase risk of anterior cruciate ligament injury. Fatigue altered ankle kinetics and kinematics features which increased