Table 3. Geometry measurement in cross-section of cortical bone. Values are means (±SEM).
1-Week 2-Week 4-Week 8-Week
L1 C1 L2 C2 L4 C4 L8 C8
Femur n=12 n=12 n=12 n=12 n=12 n=11 n=12 n=12
Iml (mm4) 6.67 (.30) 6.96 (.31) 6.46 (.36) 6.70 (.37) 8.40 (.45) 7.41 (.37) 8.79 (.51) 8.18 (.35)
Ct.Ar (mm2) 6.24 (.15) 6.78 (.12) 6.43 (.26) 6.45 (.13) 7.25 (.09) 6.81 (.10)** 7.80 (.10) 7.59 (.14)
Tt.Ar (mm2) 10.77 (.21) 10.85 (.31) 10.67 (.28) 10.76 (.27) 11.67 (.23) 11.00 (.27) 11.92 (.26) 11.74 (.18)
Ct.Th (mm) .63 (.01) .69 (.01)*** .66 (.02) .66 (.01) .72 (.01) .69 (.01)* .78 (.01) .75 (.01)
Tibia n=10 n=12 n=10 n=9 n=12 n=12 n=12 n=12
Ct. vBMD (g/cm3) 3.50 (.22) 3.50 (.29) 2.91 (.19) 3.17 (.24) 3.56 (.20) 3.40 (.16) 3.87 ± 0.10 3.41 (.16)*
Ct. BMC (mg) 4.50 (.13) 4.32 (.15) 4.23 (.21) 4.59 (.19) 5.13 (.11) 5.07 (.11) 5.43 ± 0.07 5.09 (.10)**
Ct. vBMD (g/cm3) 7.51 (.22) 7.40 (.35) 6.86 (.31) 6.87 (.33) 7.44 (.20) 7.31 (.16) 7.58 ± 0.12 7.33 (.17)
Ct. BMC (mg) .55 (.02) .52 (.02) .54 (.03) .59 (.01) .65 (.01) .65 (.01) 0.70 ± 0.02 .65 (.01)**
*,** and *** denote p ≤ 0.05, 0.01 and 0.001, respectively, between landing group to the time-matched sedentary control group. Iml, moment of inertia about the mediolateral axis for femora; Iap, moment of inertia about the antero-posterior axis for tibiae; Ct.Ar, cortical bone area; Tt.Ar, total cross-sectional area inside the periosteal envelope; Ct.Th, average cortical thickness.