Table I.

Results of the tensile test.

			Tangent modulus (kPa)
Tissue	Elongation at failure (kPa)	Tensile strength (kPa)	0–0.1	0.1–0.2	0.2–0.4	0.4–0.6	0.6
Young gray matter (n=6)	0.386±0.0358	92.6±6.62	140±20.9	298±26.0	315±77.6	37.3±13.2
Young white matter (n=8)	0.928±0.115d	110±20.9	93.6±19.0d	155±34.1d	188±35.5d	115±27.4d	63.0±15.4
Old gray matter (n=6)	0.459±0.0733	60.2±30.5b	33.2±14.6b	70.6±30.8b	206±74.7b	98.0±92.2b
Old white matter (n=7)	0.852±0.293c	112±41.2c	65.4±32.5c	113±52.9	171±33.1	229±54.2a,c	79.2±31.9

Values are presented as the means ± standard deviation.

^aP<0.05 (Student's t-test) comparison with young white matter.

^bP<0.05 (Student's t-test) comparison with young gray matter.

^cP<0.05 (Student's t-test) comparison with old gray matter.

^dP<0.05 (Student's t-test) comparison with young gray matter.