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. 2020 Dec 3;11:600590. doi: 10.3389/fphys.2020.600590

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.