Changes in the Medial and Lateral Gastrocnemius Fiber Architecture with Age.
Yanjie Xue 1 , Usha Sinha 1 , Vadim Malis 1 , Robert Csapo 2 , and Shantanu Sinha 2
Physics, SDSU, San Diego, CA, United States,
UCSD, San Diego, CA, United States
Age related changes in muscle alter fiber architecture
(fiber lengths and pennation angles). Diffusion tensor
imaging (DTI) allows the mapping of fiber architecture,
this study investigates age related changes in fiber
architecture of the medial and lateral gastrocnemius
using DTI. Ten female subjects (5 young/ 5 old) were
imaged using DTI and fiber length and pennation angles
were determined. Decreases in fiber length and pennation
angle were seen in the older cohort as well as regional
differences between distal and middle origin fibers. The
length/pennation angle changes in the LG were smaller
than those seen in the MG.
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