ABSTRACT
This study presents subject specific analysis using friction cone to assess the relation between normal and tangential ground reaction force (GRF) during impulsion phase on maximum vertical jump (MVJ) at countermovement jump (CMJ) and drop jump (DJ) for comparison with squat jump (SJ). Experimental ensemble is composed by six adult male voluntary sports students, performing each 3 SJ, CMJ, and DJ repetitions. During trial tests GRF were acquired with force platform and Simi Motion 3D. Normal and tangential GRF were assessed using friction cone and spherical coordinates for detection of the components relation and achieved performance at SJ, CMJ and DJ. Results conduced to detection of higher friction at DJ with lower impulse time and vertical height, and lower friction at SJ with intermediate impulse time and vertical height, whereas CMJ with intermediate friction presents higher impulse time and vertical height, pointing intermediate friction level association to higher performance.
