Table 1. Pre-exercise values of indices of electrostimulation-induced contractions of quadriceps muscle and MVCF in men (n=11). Data are means (±SD). Pt (N) Ct (ms) Rt (ms) P20 (N) P100 (N) P20/P100 MVCF (N) Height of DJ (cm) 79.7 (27.8) 78.5 (9.7) 58.4 (13.9) 274.7 (21.1) 319.4 (76.2) .88 (.11) 596.2 (23.4) 40.2 (10.1) Pt, P20 and P100 – muscle contraction force evoked by stimulating quadriceps muscle at 1 Hz, 20 Hz and 100 Hz frequencies. Ct – Pt contraction time; Rt – relaxation to half Pt time; MVCF – maximum voluntary contraction force; Height of DJ – height of drop jumps.