What are the kinematical differences in soccer instep kicking with the dominant and non-dominant limbs?
University of Wales
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The concept of ambidexterity within sport is highly desirable as it gives the performer an advantage over their opponent. This is why it is important to analyse the differences between the dominant and non-dominant limbs to help improve performance. The aims of this study were to analyse the release speed of the ball in maximal instep kicking with the dominant and non-dominant limb and to relate accuracy to defined joint angles, angular velocity and speed of the ball. Three skilled soccer players performed maximal speed kicks with a rolling ball from their own accord, with the dominant and non-dominant leg. Their movements were analysed using CODAmotion V6.69G (200 Hz) with 16 markers attached to 8 specific anatomical landmarks on both sides of the body. The data collected through CODA was time normalised to aid comparison and the speed of the ball was measured using a SpeedTrac X Radar Gun (Kmph). Higher ball speed was achieved with the dominant leg for successful and unsuccessful kicks and the angular velocity at the ankle, knee and hip were predominately higher for the dominant leg. The higher ball speeds and greater angular velocity at the ankle knee and hip were caused by the greater range of movement at the dominant leg due to the extension at the hip and the flexion of the knee at the beginning of the kicking phase. No differences were found at the ankle in terms of velocity. It was concluded that a lower joint angular velocity produces a lower ball speed but a more accurate kick. Finally the differences between the successful and non-successful kicks were significant, whilst the differences between the dominant and non-dominant leg were not.
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