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An investigation into the physical determinants of change of direction speed

机译:方向速度变化的物理决定因素研究

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Aim. Change of direction speed (CODS) is an important attribute for many sports and is believed to be influenced by a variety of physical factors. However, there is a lack of consensus as to which physical attributes relate to CODS. The aim of this study was to examine the relationship of several physical attributes to CODS.rnMethods. Thirty-eight subjects (mean±SD: age, 21.5±3.8 years; height, 1.77±0.07 m; mass, 77.5±13.9 kg) undertook tests of speed, CODS, strength and power. Running speed was assessed via a 25 m sprint with split times taken at 5,20 and 25 m. CODS was assessed by a 505-test, which involves measuring the time to complete a 5 m out and back course. The strength and power tests included unilateral isokinetic concentric and eccentric knee extensor and flexor strength at 60°/s and bilateral leg press, countermovement and drop jumps. Pearson's product moment correlation and co-efficients of determination were used to explore relationships amongst all variables. Multiple regression was used to determine the combined effects of significantly correlated variables on CODS. Results. Stepwise multiple regression revealed that running speed explained 58% of the variance in CODS (F_(1,33)=45.796, P<0.001) with the addition of eccentric knee flexor strength raising the value to 67% (F_(1,32)=8.781, P=0.006). Conclusion. The results suggest that for basic improvements in CODS, athletes should seek to maximise their sprinting ability and enhance their eccentric knee flexor strength to allow effective neuromuscular control of the contact phase of the CODS task.
机译:目标。方向速度的变化(CODS)是许多运动的重要属性,并且据信会受到多种物理因素的影响。但是,关于哪些物理属性与CODS有关尚缺乏共识。这项研究的目的是研究几种物理属性与CODS的关系。 38名受试者(平均±SD:年龄,21.5±3.8岁;身高,1.77±0.07 m;体重,77.5±13.9 kg)进行了速度,CODS,力量和力量测试。运行速度是通过25 m冲刺评估的,分割时间分别为5,20和25 m。通过505次测试评估了CODS,该测试涉及测量完成5 m出航和后航的时间。力量和力量测试包括60°/ s的单侧等速同心和偏心膝盖伸肌和屈肌力量以及双侧腿部按压,反移动和跌落跳跃。皮尔逊的乘积矩相关性和确定系数被用来探索所有变量之间的关系。多元回归用于确定CODS上显着相关变量的综合影响。结果。逐步多元回归显示,跑步速度解释了CODS中58%的方差(F_(1,33)= 45.796,P <0.001),并且偏心膝屈肌力量的增加将其值提高到67%(F_(1,32) = 8.781,P = 0.006)。结论。结果表明,为了对CODS进行基本改善,运动员应寻求最大程度地提高短跑能力并增强偏心膝屈肌力量,以有效地神经肌肉控制CODS任务的接触阶段。

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