Affsect coupling in the lower extremity joints has on the consistancy of the step characteristics in the early acceleration phase of the sprint running
University of Wales Institute Cardiff
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Purposes: This study was conducted to develop the understanding of the influence variability in the coordination between the lower extremity joints in the support leg have on the consistency of the step characteristics in the early accelerating phase of sprint running. Methods: Five well-trained male sprinters performed eight maximal effort sprints over 10 meters. The kinematic data for the first three steps of the sprint where captured using automatic motion analysis system CODA CX1. Step velocity, step length and step frequency where found for each subject. The coefficient of variation in step velocity, step length and step frequency was found for each subject. The variability in the continuous joint angle profile differences in the lower extremity where found to show the joint coupling and plotted against the variability in the step characteristics using a linear correlation and regression graphs to test for a linear relationship. Results: The variability in the coupling of the ankle – knee had a strong positive correlation r = 0.91 with step frequency variability and r = 0.49 with step velocity variability. The variability in the coupling of the ankle – hip was shown to have a strong positive correlation r = 0.79 with step frequency variability, step length variability r = 0.68 and step velocity variability r = 0.94. Indicating these couplings are indicative of the consistency of the step characteristics. Conclusion: The ankle joint was found to have a significant role in enabling consistent performance in the step characteristics by coordinating its movement with the knee and the hip joint.
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