Time-course of exercise and its association with 12-month bone changes

Table 2 Correlation between the impact exercise at 0-3, 0-6 and 0-12 months and bone geometry changes

			Average daily numbers of impacts at different acceleration levels
	0-3 months					0-6 months					0-12 months
	0.3- 1.0 g	1.1- 2.4 g	2.5- 3.8 g	3.9- 5.3 g	5.4- 9.2 g	0.3- 1.0 g	1.1- 2.4 g	2.5- 3.8 g	3.9- 5.3 g	5.4- 9.2 g	0.3- 1.0 g	1.1- 2.4 g	2.5- 3.8 g	3.9- 5.3 g	5.4- 9.2 g
Mid-femur
Bone circumference	-0.02	0.17	0.07	0.22	0.45⁽*⁾	0.01	0.21	0.35	0.37	0.45*	0.04	0.23	0.39*	0.41*	0.45*
Cortical CSA	0.08	0.37	0.35	0.35	0.28	0.06	0.33	0.26	0.41⁽*⁾	0.39⁽*⁾	0.12	0.36	0.26	0.41⁽*⁾	0.43*
Cortical attenuation	0.08	0.43⁽*⁾	0.41⁽*⁾	0.52⁽*⁾	0.49⁽*⁾	0.10	0.47⁽*⁾	0.51*	0.54*	0.51*	0.18	0.52*	0.52*	0.54*	0.54*
Max cortical CSMI	0.27	0.38⁽*⁾	0.29	0.34	0.39⁽*⁾	0.29	0.41⁽*⁾	0.39⁽*⁾	0.38⁽*⁾	0.42⁽*⁾	0.38⁽*⁾	0.46*	0.42*	0.43*	0.45*
Cortical thickness	0.04	0.40⁽*⁾	0.33	0.31	0.26	0.00	0.38⁽*⁾	0.30	0.44⁽*⁾	0.39⁽*⁾	0.05	0.41*	0.30	0.44*	0.41*

g acceleration of gravity (9.81 m·s^-2), CSA cross-sectional area, CSMI cross-sectional moment of inertia.
* p < 0.05, after Benjamini-Hochberg correction for multiple comparisons
⁽*⁾ the association did not remain significant in multivariate analysis after adjustment for impacts at later months and other confounding factors.
Pearson's correlation coefficients (r) between the impact exercise at different acceleration levels in 0-3, 0-6 and 0-12 months, and changes in cortical bone geometry measured with quantitative computed tomography. N = 35

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