TABLE 1.

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

		Group	SOL
			30% MVC	40% MVC	60% MVC
SR fiber	[ms–1]	Young	−731 ± 387	−906 ± 389	−1,102 ± 588
		Senior	–805 ± 683	−769 ± 344	−1,021 ± 664
SR out–plane	[ms–1]	Young	28 ± 218	−105 ± 115	−10 ± 277
		Senior	−76 ± 85	20 ± 60	−92 ± 81
SR in–plane	[ms–1]	Young	551 ± 196	660 ± 319	888 ± 360
		Senior	509 ± 303	530 ± 221	599 ± 321
SR max	[ms–1]	Young	1,082 ± 481	1,305 ± 516	1,656 ± 634
		Senior	1,103 ± 832	1,087 ± 410	1,363 ± 801
L fiber*		Young	−0.395 ± 0.216	−0.477 ± 0.242	−0.512 ± 0.188
		Senior	−0.287 ± 0.106	−0.327 ± 0.090	−0.363 ± 0.116
L out–plane		Young	−0.016 ± 0.093	−0.053 ± 0.136	−0.023 ± 0.129
		Senior	–0.041 ± 0.056	−0.011 ± 0.065	0.005 ± 0.060
L in–plane		Young	0.240 ± 0.062	0.291 ± 0.103	0.306 ± 0.097
		Senior	0.228 ± 0.125	0.285 ± 0.117	0.264 ± 0.116
L max*		Young	0.519 ± 0.212	0.630 ± 0.265	0.682 ± 0.194
		Senior	0.403 ± 0.156	0.475 ± 0.141	0.498 ± 0.172
L vol		Young	−0.171 ± 0.268	−0.295 ± 0.297	−0.248 ± 0.327
		Senior	−0.107 ± 0.195	−0.086 ± 0.206	−0.184 ± 0.086

*L _fiber, L _max, p < 0.05 between age groups.