Table 4a. Stiff leg drop jump (SDJ) height (cm), contact time (CT, ms), reactive strength index (RSI, m/sec), and peak power (PP, watt) values (means ±SD). 40-s 80-s 120-s Control pre- post- pre- post- pre- post- pre- post- Height 21.2 ± 3.9 20.9 ± 4.5 21.4 ± 3.7 21.1 ± 4.4 21.5 ± 3.6 20.9 ± 4.1 22.8 ± 3.9 21.9 ± 4.1 CT 265.2 ± 48.7 258.9 ± 55.5 257.7 ± 44.4 263.3 ± 54.8 259.1 ± 43.4 278.5 ± 54.5 259.4 ± 44.3 267.9 ± 49.9 RSI 0.8 ± 0.22 0.81 ± 0.20 0.83 ± 0.21 0.80 ± 0.21 0.83 ± 0.20 0.75 ± 0.21 0.88 ± 0.24 0.82 ± 0.28 PP 26.8 ± 5.3 25.7 ± 4.7 26.6 ± 5.0 25.5 ± 5.1 26.4 ± 4.4 24.9 ± 5.1 27.7 ± 5.4 26.3 ± 6.3 RSI: reactive strength index (RSI=HT(meters)/CT(seconds).