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.