Ibrahim Haridy, A., Abdel-Raouf Diab, M., Ismail El-Shaer, O., Mohamed Abdel-Gawad, M. (2015). Changes in Vertical and Leg Stiffness during Triple Jump Performance. Journal of Applied Sports Science, 5(1), 55-60. doi: 10.21608/jass.2015.84462
Abdel-Monaem Ibrahim Haridy; Mohamed Abdel-Raouf Diab; Osama Ismail El-Shaer; Moamen Mohamed Abdel-Gawad. "Changes in Vertical and Leg Stiffness during Triple Jump Performance". Journal of Applied Sports Science, 5, 1, 2015, 55-60. doi: 10.21608/jass.2015.84462
Ibrahim Haridy, A., Abdel-Raouf Diab, M., Ismail El-Shaer, O., Mohamed Abdel-Gawad, M. (2015). 'Changes in Vertical and Leg Stiffness during Triple Jump Performance', Journal of Applied Sports Science, 5(1), pp. 55-60. doi: 10.21608/jass.2015.84462
Ibrahim Haridy, A., Abdel-Raouf Diab, M., Ismail El-Shaer, O., Mohamed Abdel-Gawad, M. Changes in Vertical and Leg Stiffness during Triple Jump Performance. Journal of Applied Sports Science, 2015; 5(1): 55-60. doi: 10.21608/jass.2015.84462
Changes in Vertical and Leg Stiffness during Triple Jump Performance
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.