TABLE 2.

Peak strain rate and strain indices for a region of interest in GM averaged across young and senior subjects.

		Group	GM
			30% MVC	40% MVC	60% MVC
SR fiber†	[ms–1]	Young	−596 ± 290	−777 ± 282	−940 ± 316
		Senior	−651 ± 375	−709 ± 327	−922 ± 421
SR out–plane	[ms–1]	Young	−96 ± 174	−31 ± 137	−76 ± 91
		Senior	−71 ± 171	−49 ± 112	−47 ± 194
SR in–plane†	[ms–1]	Young	583 ± 339	744 ± 270	961 ± 336
		Senior	577 ± 302	726 ± 415	945 ± 538
SR max†	[ms–1]	Young	992 ± 503	1,270 ± 315	1,587 ± 473
		Senior	1,025 ± 548	1,197 ± 579	1,552 ± 706
L fiber†		Young	−0.254 ± 0.129	−0.371 ± 0.176	−0.420 ± 0.120
		Senior	−0.235 ± 0.127	−0.265 ± 0.103	−0.354 ± 0.179
L out–plane		Young	−0.003 ± 0.085	0.033 ± 0.128	−0.001 ± 0.142
		Senior	−0.014 ± 0.076	0.002 ± 0.058	−0.004 ± 0.109
L in–plane*†		Young	0.422 ± 0.116	0.569 ± 0.161	0.697 ± 0.204
		Senior	0.378 ± 0.197	0.459 ± 0.215	0.543 ± 0.217
L max*†		Young	0.552 ± 0.175	0.765 ± 0.243	0.899 ± 0.221
		Senior	0.509 ± 0.266	0.600 ± 0.256	0.715 ± 0.297
L vol		Young	0.169 ± 0.212	0.305 ± 0.155	0.350 ± 0.249
		Senior	0.153 ± 0.183	0.203 ± 0.160	0.177 ± 0.253

*L _in–plane, L _max p < 0.05 between age groups. ^†SR _fiber, SR _in–plane, SR _max, L _fiber, L _in–plane, L _max p < 0.05 between 30 and 60% MVC.