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• W3036074438 abstract "Prior studies have observed an age-related decline in net ankle power and work at faster walking speeds. However, the underlying changes in muscle-tendon behavior are not well understood, and are challenging to infer from joint level analyses. This study used shear wave tensiometry to investigate the modulation of force and work done by the triceps surae across walking speeds. Fourteen healthy young (7F/7M, 26±5 years) and older (7F/7M, 67±5 years) adults were tested. Subjects walked on an instrumented treadmill at four walking speeds (0.75, 1.00, 1.25, and 1.50 m/s) while lower extremity kinematics and Achilles tendon shear wave speeds were collected. Subject-specific calibrations were used to compute Achilles tendon force from wave speed. Excursions of the soleus and gastrocnemius muscle-tendon units were computed from the kinematic data and subject-specific measures of the Achilles tendon moment arm. Work loop plots were then used to assess effective muscle-tendon stiffness during lengthening, and positive, negative, and net work production during stance. Two-way mixed ANOVAs were used to evaluate the effects of age group and walking speed on each outcome measure. Tendon loading during muscle-tendon lengthening (effective stiffness) did not differ between age groups, but did vary with speed. The soleus became effectively stiffer with increasing speed while the gastrocnemius became effectively more compliant. There was a marked age-related deficit in net soleus (-66% on average) and gastrocnemius (-36%) work across all walking speeds. We did not observe an age-speed interaction effect on net work production. These results suggest the age-related decline in triceps surae output in walking is pervasive across speed, and hence seemingly not linked to absolute mechanical demands of the task." @default.
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• W3036074438 date "2020-06-19" @default.
• W3036074438 modified "2023-10-16" @default.
• W3036074438 title "Shear Wave Tensiometry Reveals an Age-Related Deficit in Triceps Surae Work at Slow and Fast Walking Speeds" @default.
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• W3036074438 doi "https://doi.org/10.3389/fspor.2020.00069" @default.
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