Table 3.

Body size changes over 6 or 12 mos of weight training

Variable nameBaseline
6 mos
12 mos
Δ0-6 mos
P for 0-6 mo differences*Δ6-12 mos
P for within-person control tests
nMean ± SDnMean ± SDnMean ± SDMean ± SDMean ± SD
Body weight (kg)
    Immediate treatment4069.21 ± 2.223969.54 ± 2.223369.15 ± 2.230.32 ± 0.430.84−0.38 ± 0.460.76
    Delayed treatment§4168.96 ± 2.204069.16 ± 2.203669.59 ± 2.200.20 ± 0.420.43 ± 0.44
BMI (kg/m2)
    Immediate treatment4025.94 ± 0.733925.99 ± 0.743325.81 ± 0.740.06 ± 0.170.95−0.18 ± 0.180.77
    Delayed treatment§4125.76 ± 0.734025.83 ± 0.733625.98 ± 0.730.07 ± 0.160.15 ± 0.17
Body fat (kg)
    Immediate treatment4028.81 ± 1.723928.29 ± 1.723327.34 ± 1.73−0.52 ± 0.430.23−0.95 ± 0.460.08
    Delayed treatment§4128.75 ± 1.704028.97 ± 1.703627.87 ± 1.700.22 ± 0.43−1.10 ± 0.45
Lean mass (kg)
    Immediate treatment4037.90 ± 0.773938.78 ± 0.773339.29 ± 0.780.88 ± 0.230.0080.50 ± 0.24<0.0001
    Delayed treatment§4137.64 ± 0.764037.66 ± 0.773639.11 ± 0.770.02 ± 0.231.45 ± 0.24
Body fat %
    Immediate treatment4042.05 ± 1.313940.91 ± 1.313339.82 ± 1.32−1.15 ± 0.450.03−1.08 ± 0.480.003
    Delayed treatment§4142.05 ± 1.294042.29 ± 1.303640.21 ± 1.300.23 ± 0.44−2.07 ± 0.46
Waist circumference (cm)
    Immediate treatment4094.44 ± 2.013994.59 ± 2.023392.53 ± 2.050.14 ± 1.050.39−2.05 ± 1.120.22
    Delayed treatment§4193.04 ± 1.984094.45 ± 1.993693.61 ± 2.011.41 ± 1.04−0.84 ± 1.08
  • * P from test for comparing the changes in the immediate treatment group to the changes in the delayed treatment group over the first 6 mos of the study (randomized controlled trial).

  • P from test for comparing the delayed treatment group changes from mos 7 to 12 to the delayed treatment group changes from mos 0 to 6 (within person control).

  • The immediate treatment group trained from 0 to 12 mos continuously.

  • § The delayed treatment group started training after the 6-mo measures were complete and through 12 mos.