Table 3.

Collected SWV data from volunteer subjects, including interspinous distances in physiologic extension and flexion, percent increase between the positions, and SWV in both positions.

Level	Subjects, N	Extension Distance, cm	Flexion Distance, cm	% Increase	Extension SWV, m/s	Flexion SWV, m/s	% Increase
T10-T11	7	1.34 ± 0.12	1.48 ± 0.28	11	2.50 ± 0.97	3.28 ± 1.20	31
T12-L1	9	1.02 ± 0.32	1.61 ± 0.30	58	1.71 ± 0.59	4.08 ± 1.13	139
L2-L3	9	0.96 ± 0.27	1.86 ± 0.34	93	1.70 ± 0.36	5.01 ± 1.58	195
L4-L5	9	0.84 ± 0.31	1.91 ± 0.46	127	1.53 ± 0.37	4.59 ± 2.31	200

Abbreviation: SWV, shear wave velocity.