Changes in Vertical and Leg Stiffness during Triple Jump Performance

Document Type : Original Article

Authors

1 Faculty of Physical Education for Boys, Alexandria University, Alexandria, Egypt

2 Faculty of Physical Education, Mansoura University, Mansoura, Egypt

Abstract

Purpose: the aim of the present study to identify changes in vertical stiffness(K_vert) and leg stiffness 〖(K〗_leg) during triple jump and identify the relationship between both vertical and leg stiffness and horizontal velocity and the loss of horizontal velocity.
Methods: Six male triple jumpers were videotaped during triple jump performance with three video cameras 60 Hz and the analysis was performed by DARTFISH TEAM PRO 4.5 software program, One-way repeated measure ANOVA was performed for each parameter. For the correlation analysis Pearson’s correlation coefficients were used to examine the relationships between both (K_vertand〖 K〗_leg), and horizontal velocity and loss of horizontal velocity.
Results:K_vertreached maximum value at hop (31.42 kN/m), then decreased consistently during step (25.83 kN/m) and jump (20.33 kN/m. Decrease in horizontal velocity during step and jump was 11.3 % and 13.4% respectively. On the other hand K_leg reaches a minimum value during hope (13.77 kN/m), then peaked at step phase (25.89 kN/m) and decreased during jump (16.97 kN/m).
Conclusion: the results of the present study suggested that a higher K_vert values are necessary to maintain horizontal velocity and minimizing the loss of horizontal velocity during triple jump performance. And also K_leg plays an important role in maintaining horizontal velocity during step and jump but not in whole triple jump performance.

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