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
1RMBS (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.