Shear Wave Tensiometry Reveals an Age-Related Deficit in Triceps Surae Work at Slow and Fast Walking Speeds.
Shear Wave Tensiometry Reveals an Age-Related Deficit in Triceps Surae Work at Slow and Fast Walking Speeds.
复制标题
剪切波张力计揭示了三头肌相关的赤字，以缓慢而快速的步行速度工作。
DOI：
10.3389/fspor.2020.00069
复制
发表时间：
2020
影响因子：
2.7
通讯作者：
Thelen DG
中科院分区：
文献类型：
--
作者：
Ebrahimi A;Martin JA;Schmitz DG;Thelen DG
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 deficit in triceps surae output in walking is pervasive across speed, and hence seemingly not linked to absolute mechanical demands of the task.
登录
查看更多内容
影响因子：
4.6
作者：
Keuler, Emily M.;Loegering, Isaac F.;Thelen, Darryl G.
通讯作者：
Thelen, Darryl G.
影响因子：
2.4
作者：
Hawkins, David;Lum, Corey;Dunning, Russell
通讯作者：
Dunning, Russell
DOI：
10.1109/86.650292
发表时间：
1997-12-01
期刊：
IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society
影响因子：
--
作者：
Buford, W L Jr;Ivey, F M Jr;Stewart, A A
通讯作者：
Stewart, A A
影响因子：
2.8
作者：
Cronin, Neil J.;Avela, Janne;Peltonen, Jussi
通讯作者：
Peltonen, Jussi
DOI：
10.1046/j.1365-201x.2002.00917.x
发表时间：
2002-01-01
期刊：
ACTA PHYSIOLOGICA SCANDINAVICA
影响因子：
--
作者：
Hof, AL;Van Zandwijk, JP;Bobbert, AF
通讯作者：
Bobbert, AF