The research group consisted of elite soccer players (n = 138, age = 25,1 +- 4,7 years, height = 184,2 +- 7,2 cm, weight = 79,7 +- 8,1 kg). For recording force effect of lower limbs on the surface, two force platforms Kistler B8611A (KISTLER Instrumente AG, Switzerland) were used.
All participants performed three types of a vertical jump, T1 - countermovement jump with arms included, T2 - countermovement jump with arms excluded, T3 - squat jump. Evaluation parameters were: high of the jump (cm), maximal strength produced by separate lower limb FmaxR(L) and strength impulse produced by separate lower limb during the take off (Ns-1).