The aim of this paper was to determine the participation of the supporting feet in vertical jump take-off with run-up. Vertical and horizontal components were recorded for total impulse, brake impulse and acceleration impulse. 23 physical education undergraduates and baseball/basketball players participated in the study (average height 179 ± 6.1 cm.; average mass: 70.96 ± 8.82 kg). Two force platforms were used (Dinascan - IBV), one for each supporting foot, timesynchronised to a high speed video camera (Redlake Motion Space 1000 S) at 250 Hz. The results show that the second foot delay does not influence vertical component mean acceleration impulses, so there will be no advantage in CG height. Horizontal component impulse, developed by the first supporting foot, is greater when the time between foot contact is increased (p<0.001) but no differences were found for the second foot.
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