Figure 1.

Body position and the kinetic and kinematic variables in selected takeoff phases of the CMVJ. F - vertical component of the ground reaction force,

V - velocity of the body center of gravity,

tP - duration of the preparatory phase,

tB - duration of the braking phase,

tA - duration of the accelerating phase,

tT - total duration of the takeoff phase (tT = tP + tB + tA),

IB - impulse in the braking phase $(\mathrm{I}\mathrm{B}=\underset{\mathrm{t}1}{\overset{\mathrm{t}2}{\int }}\mathrm{F}(\mathrm{t})\cdot \mathrm{d}(\mathrm{t}))-G\cdot tB)$,

IA- impulse in the accelerating phase $(\mathrm{I}\mathrm{A}=\underset{\mathrm{t}2}{\overset{\mathrm{t}3}{\int }}\mathrm{F}(\mathrm{t})\cdot \mathrm{d}(\mathrm{t})-G\cdot tA)$,

FBA- average force in the braking phase (FBA = IB / tB + G, where G = m · g);

FAA - average force in the accelerating phase (FAA = IA / tA + G)