Directional Dependence of Experimental Trunk Stiffness: Role of Muscle-Stiffness Variation of Nonneural Origin

Table 1

Experimental stiffness results.

			99% CI			99% CI	(%)
Trunk loading (N)	μ (N/mm); ()	SD; (N/mm)		μ (N/mm); ()	SD; (N/mm)
350	2.41	(0.11)	[2.32; 2.50]	2.05	(0.11)	[1.96; 2.14]	17.5
483.5	2.54	(0.11)	[2.45; 2.63]	2.42	(0.09)	[2.35; 2.49]	4.9
617	3.00	(0.13)	[2.90; 3.10]	3.13	(0.10)	[3.05; 3.21]	–4.1
750	3.19	(0.10)	[3.10; 3.27]	3.47	(0.13)	[3.36; 3.58]	–8

μ: mean value; SD: standard deviation; CI: confidence interval for the mean value; : .