Alterations to the orientation of the ground reaction force vector affect sprint acceleration performance in team sports athletes

被引:27
作者
Bezodis, Neil E. [1 ,2 ]
North, Jamie S. [2 ]
Razavet, Jane L. [2 ]
机构
[1] Swansea Univ, Appl Sports Technol Exercise & Med Res Ctr, Swansea, W Glam, Wales
[2] St Marys Univ, Sch Sport Hlth & Appl Sci, Twickenham, England
关键词
Attentional focus; biomechanics; ratio of forces; sprinting; technique; ATTENTIONAL FOCUS; POWER PREDICTORS; EXTERNAL FOCUS; STRENGTH; KINEMATICS; MOVEMENT; POSITION; IMPULSE;
D O I
10.1080/02640414.2016.1239024
中图分类号
G8 [体育];
学科分类号
04 ; 0403 ;
摘要
A more horizontally oriented ground reaction force vector is related to higher levels of sprint acceleration performance across a range of athletes. However, the effects of acute experimental alterations to the force vector orientation within athletes are unknown. Fifteen male team sports athletes completed maximal effort 10-m accelerations in three conditions following different verbal instructions intended to manipulate the force vector orientation. Ground reaction forces (GRFs) were collected from the step nearest 5-m and stance leg kinematics at touchdown were also analysed to understand specific kinematic features of touchdown technique which may influence the consequent force vector orientation. Magnitude-based inferences were used to compare findings between conditions. There was a likely more horizontally oriented ground reaction force vector and a likely lower peak vertical force in the control condition compared with the experimental conditions. 10-m sprint time was very likely quickest in the control condition which confirmed the importance of force vector orientation for acceleration performance on a within-athlete basis. The stance leg kinematics revealed that a more horizontally oriented force vector during stance was preceded at touchdown by a likely more dorsiflexed ankle, a likely more flexed knee, and a possibly or likely greater hip extension velocity.
引用
收藏
页码:1817 / 1824
页数:8
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