Table 3. Effects of a 7-week training program on Strength, Velocity and Power variables in the Back Squat and Jumping Ability test. Data are means (±SD). Variable Group Pre Post p for Group p for GxTi ES/SP p for Ti ES/SP 1RM BS (kg) IRT 83.08 (13.84) 93.91 (17.37) .034‡ .002‡ .3/.935 .000* .5/.999 TRT 85.80 (26.16) 96.60 (21.32) CG 78.91 (12.79) 78.41 (12.09) BS AV (m·s-1) IRT .95 (.15) 1.05 (.16) .062 .000* .3/.991 .000* .4/1.0 TRT .96 (.19) 1.05 (.18) CG .95 (.14) .95 (.14) BS PV (m·s-1) IRT 1.52 (.23) 1.65 (.23) .104 .005‡ .2/.850 .000* .2/.994 TRT 1.57 (.30) 1.64 (.24) CG 1. 51 (.24) 1.52 (.24) BS AP (W) IRT 414.34 (68.71) 457.79 (69.86) .029‡ .000* .3/.990 .000* .2/.975 TRT 417.52 (81.29) 456.42 (80.48) CG 422.10 (81.04) 407.88 (71.30) BS PP (W) IRT 811.69 (170.1) 969.33 (188.20) .014‡ .005‡ .2/.845 .000* .3/1.0 TRT 832.56 (208.8) 1018.26 (289.50) CG 815.70 (167.20) 835.37 (167.10) SJ (cm) IRT 26.3 (4.7) 32.1 (5.4) .059 <.001* .6/1.0 <.001* .8/1.0 TRT 28.3 (6.2) 34.0 (5.2) CG 28.6 (4.5) 28.8 (4.6) CMJ (cm) IRT 31.7 (5.6) 37.3 (6.3) .079 <.001* .5/.999 <.001* .7/1.0 TRT 34.2 (7.0) 39.4 (6.3) CG 33.8 (4.2) 33.9 (4.3) * = differences between groups; p < 0.001. ‡ = differences between groups; p < 0.05. 1RM = 1 repetition maximum; AP= Average power; AV = Average velocity; BS = back squat; CG = control group; cm = centimeter; CMJ = counter movement jump; ES = Effect size; GxTi = group x time; IRT= instability resistance training program; kg = kilogram; m·s= meter·second; Post = posttest; PP = Peak power; Pre = pretest; PV = Peak velocity; SJ = squat jump; SP = statistical power; TRT= traditional resistance training program; Ti = Time; W= watts.