Sport Sciences Research Institute Studies in Sport Medicine 2322-1658 11 26 2020 01 21 Analysis of Selected Kinetic-Temporal Variables of Lower Extremity of Elite junior volleyball players during Block Jump Skill Analysis of Selected Kinetic-Temporal Variables of Lower Extremity of Elite junior volleyball players during Block Jump Skill 81 90 2131 10.22089/smj.2020.8290.1412 FA Ali Fatahi Assistant Professor, Sports Biomechanics Department, Physical Education and Sports Sciences Faculty, Islamic Azad University of Central Tehran Branch, Tehran, Iran 0000-0002-8863-4061 Razieh Yousefian Molla PhD Candidtate, Sports Biomechanics Department, Physical Education and Sports Sciences Faculty, Islamic Azad University of Central Tehran Branch, Tehran, Iran Mitra Ameli Master of Physical Education and Sport Sciences, Physical Education and Sport Sciences Department, Payam-E-Noor University, Tehran, Iran 0000-0002-4876-3037 Journal Article 2020 01 20 The aim of this study was to Analysis of Selected Kinetic-Temporal Variables of Lower Extremity of Elite junior volleyball players during Block Jump Skill. 30 junior volleyball players of National Team of the Islamic Republic of Iran stand on Force platform and performed block jump skill, peak vertical forces, Time of peaks, Time elapsed between peaks, time of contact, end of the landing, total landing time, Ratio between peaks and between the time of the peaks were calculated. There are significant positive correlations between Times of peaks, Time elapsed between peaks and peak vertical forces and negative correlations exist between other variables of the research. So in volleyball players great stress would be placed on lower extremity at the moment of landing. Because of increasing time of the second peak will decrease the impact force, although it is not appropriate for volleyball goals. The aim of this study was to Analysis of Selected Kinetic-Temporal Variables of Lower Extremity of Elite junior volleyball players during Block Jump Skill. 30 junior volleyball players of National Team of the Islamic Republic of Iran stand on Force platform and performed block jump skill, peak vertical forces, Time of peaks, Time elapsed between peaks, time of contact, end of the landing, total landing time, Ratio between peaks and between the time of the peaks were calculated. There are significant positive correlations between Times of peaks, Time elapsed between peaks and peak vertical forces and negative correlations exist between other variables of the research. So in volleyball players great stress would be placed on lower extremity at the moment of landing. Because of increasing time of the second peak will decrease the impact force, although it is not appropriate for volleyball goals. https://smj.ssrc.ac.ir/article_2131_a869ccbcbd9568808b8497e28275c7c8.pdf