An examination of the kinematics and co-ordination of the hip and shoulder joints
Cardiff Metropolitan University
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The Tkachev is a key release and re-grasp skill used in female gymnastics. The newest variation is the toe-on Tkachev. The aim of this study was to investigate the kinematics and coordination of the hip and shoulder joints to further develop understanding of this variation of the skill. Five toe-on Tkachevs performed by female gymnasts in the 2007 World Championships were recorded using twin video cameras (50Hz). Movement images were digitised and analysed. Continuous angular displacement and velocity profiles and intra-limb continuous relative phase (CRP) relationships for the hip and shoulder joint were produced to allow kinematic and coordination analyses of the movement. Kinematic difference in circle angle for the key phases identified for the hip and shoulder confirmed the difference in the toeon variation in comparison to the older outward and inward variants. Shoulder angle of release was reported as 12.5±8˚ (circle angle 417˚) demonstrating a more flexed position imposing less demand on the body at release. CRP phase relationship of the hip and shoulder showed most of the movement to be out-of-phase with only two points of in-phase coupling throughout the movement pattern. No significant differences (p>0.05) were found between the CRP values for the five gymnasts. Further kinetic and coordination analysis is required to develop a full understanding of the skill. The difference of the toe-on variant from other techniques found in the study highlights the need for more skill specific progressions to be explored.
DEGREE OF BACHELOR OF SCIENCE (HONOURS) SPORT AND EXERCISE SCIENCE
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