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. Author manuscript; available in PMC: 2009 Oct 6.
Published in final edited form as: Spine (Phila Pa 1976). 2008 Jul 15;33(16):1731–1738. doi: 10.1097/BRS.0b013e31817bb116

Figure 4.

Figure 4

Mean stiffnesses and phase angles plotted as a percentage of those at 0.001 Hz as a function of frequency for group 1 DOFs (those thought to be dominated by poroelastic behavior) and group 2 DOFs (those thought to be dominated by intrinsic viscoelastic behavior) (error bars = 95% confidence interval).