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Razieh Yousefian Molla1 
, Luca Paolo Ardigò2 , Ali Fatahi *1 , Davood Khezri3 , Elena Mainer Pardos4 , Hadi Nobari5
, Luca Paolo Ardigò2 , Ali Fatahi *1 , Davood Khezri3 , Elena Mainer Pardos4 , Hadi Nobari5
1- Department of Physical Education and Sport Science, CT.C., Islamic Azad University, Tehran, Iran
2- Department of Teacher Education, NLA University College, 0166 Oslo, Norway
3- Department of Sport Biomechanics and Technology, Sport Sciences Research Institute, Tehran, Iran
4- Health Sciences Faculty, Universidad San Jorge, 50830 Villanueva de Gállego, Zaragoza, Spain
5- LFE Research Group, Department of Health and Human Performance, Faculty of Physical Activity and Sport Science (INEF), Universidad Politécnica de Madrid, Madrid, Spain
2- Department of Teacher Education, NLA University College, 0166 Oslo, Norway
3- Department of Sport Biomechanics and Technology, Sport Sciences Research Institute, Tehran, Iran
4- Health Sciences Faculty, Universidad San Jorge, 50830 Villanueva de Gállego, Zaragoza, Spain
5- LFE Research Group, Department of Health and Human Performance, Faculty of Physical Activity and Sport Science (INEF), Universidad Politécnica de Madrid, Madrid, Spain
Abstract: (20 Views)
Purpose: The rate of force development (RFD) is commonly used as indicator of explosive strength and has been linked to sport-specific performance. However, the exact role of RFD and other temporal variables in relation to performance criteria remains unclear. This study aimed to examine the relationship of RFD and countermovement jump (CMJ) height during the eccentric and concentric phases of the CMJ.
Methods: Fifteen professional male volleyball players participated. Each performed CMJs on a force platform. Average power, peak power, time to peak power, maximum RFD, average RFD, and peak RFD were calculated for both concentric and eccentric phases. Pearson correlation analyses were conducted to assess relationships among kinetic and temporal variables and CMJ height. Regression coefficients assessed the association of force and jump height (p<0.05).
Results: No significant correlations existed between force variables and jump height in either the eccentric or concentric phases. The findings suggest that contractile force variables, such as RFD, do not significantly influence vertical jump height during CMJ. Vertical jump height in CMJ is likely influenced more by non-contractile factors including anthropometric and biomechanical characteristics, rather than contractile force alone.
Conclusion: Therefore, caution is advised when using RFD to interpret explosive power during CMJ. Additionally, RFD may not be a reliable tool to forecast jump performance in athletes engaged in sports requiring high explosive strength.
Methods: Fifteen professional male volleyball players participated. Each performed CMJs on a force platform. Average power, peak power, time to peak power, maximum RFD, average RFD, and peak RFD were calculated for both concentric and eccentric phases. Pearson correlation analyses were conducted to assess relationships among kinetic and temporal variables and CMJ height. Regression coefficients assessed the association of force and jump height (p<0.05).
Results: No significant correlations existed between force variables and jump height in either the eccentric or concentric phases. The findings suggest that contractile force variables, such as RFD, do not significantly influence vertical jump height during CMJ. Vertical jump height in CMJ is likely influenced more by non-contractile factors including anthropometric and biomechanical characteristics, rather than contractile force alone.
Conclusion: Therefore, caution is advised when using RFD to interpret explosive power during CMJ. Additionally, RFD may not be a reliable tool to forecast jump performance in athletes engaged in sports requiring high explosive strength.
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