Changes in Vertical and Leg Stiffness during Triple Jump Performance | ||||
| Journal of Applied Sports Science | ||||
| Article 7, Volume 5, Issue 1, March 2015, Page 55-60 PDF (647.73 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jass.2015.84462 | ||||
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| Authors | ||||
| Abdel-Monaem Ibrahim Haridy1; Mohamed Abdel-Raouf Diab2; Osama Ismail El-Shaer1; Moamen Mohamed Abdel-Gawad1 | ||||
| 1Faculty of Physical Education for Boys, Alexandria University, Alexandria, Egypt | ||||
| 2Faculty 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. | ||||
| Keywords | ||||
| Vertical and Leg Stiffness; Triple Jump | ||||
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