Table 10.

Means and standard deviations (S.D.) of root mean squares of ensemble averaged lumbosacral (L5/S1) and thoracolumbar (T12/L1) 3D joint reaction forces (normalized to body weight) by method (inertial measurement unit [IMU] or optical motion capture [OMC]) across conditions.

Method	L5/S1			T12/L1
	Comp	AP shear	ML shear	Comp	AP shear	ML shear
	Mean (S.D.)	Mean (S.D.)	Mean (S.D.)	Mean (S.D.)	Mean (S.D.)	Mean (S.D.)
IMU	1.735 (0.702)	0.442 (0.186)	0.046 (0.027)	1.138 (0.451)	0.099 (0.025)	0.060 (0.032)
OMC	1.754 (0.759)	0.642 (0.306)	0.096 (0.093)	1.040 (0.387)	0.114 (0.045)	0.064 (0.038)

Comp, compression; AP, anteroposterior; ML, mediolateral.