Table 3 ANOVA test with Tukey’s multiple comparisons for structural and intrinsic mechanical properties of the right tibiae from control, sham, LI, MI and HI groups of rats derived from three-point bending tests of the mid-diaphysis.
From: High Impact Exercise Improves Bone Microstructure and Strength in Growing Rats
Parameters/Groups | Control | Sham | L.I. | M.I. | H.I. |
---|---|---|---|---|---|
Structural mechanical properties | |||||
Ultimate load, Fult (N)* | 84.9 ± 13.3 | 80.1 ± 11.2 | 89.4 ± 9.22 | 93.5 ± 7.43 α | 97.0 ± 8.16 α |
Failure load, Ffail (N) | 73.8 ± 11.6 | 67.3 ± 10.3 | 65.3 ± 10.6 | 63.4 ± 9.44 | 64.6 ± 9.82 |
Stiffness, k (N/mm)* | 123 ± 18.7 | 113 ± 16.8 | 124 ± 15.8 | 135 ± 17.6 α | 142 ± 15.8 α |
Energy to ultimate load (mJ) | 39.3 ± 5.7 | 35.3 ± 6.11 | 41.4 ± 6.82 | 42.2 ± 7.03 | 44.5 ± 7.26 |
Energy to failure load (mJ)* | 55.2 ± 17.3 | 63.5 ± 15.2 | 77.6 ± 18.4 | 81.7 ± 14.8 α | 79.8 ± 18.9 α |
Intrinsic mechanical properties | |||||
Ultimate stress, σult (MPa)* | 294 ± 44.5 | 286 ± 37.2 | 308 ± 52.1 | 319 ± 49.2 α | 316 ± 38.2 α |
Failure stress, σfail (MPa)* | 223 ± 36.2 | 216 ± 21.2 | 187 ± 30.3 | 184 ± 26.2 α | 186 ± 22.4 α |
Young’s modulus, E (GPa) | 10.9 ± 1.22 | 10.5 ± 1.46 | 11.2 ± 1.31 | 11.8 ± 1.01 | 12.3 ± 1.06 |
Energy to ultimate stress (mJ/mm3) | 3.46 ± 1.11 | 2.71 ± 0.82 | 2.56 ± 0.96 | 2.89 ± 1.21 | 2.95 ± 0.85 |
Energy to failure stress (mJ/mm3) | 8.37 ± 3.46 | 11.4 ± 4.17 | 11.7 ± 4.61 | 12.2 ± 3.19 | 11.9 ± 4.89 |