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• W3210155074 abstract "Push-off intensity is largely governed by the forces generated by the triceps surae (TS) muscles (gastrocnemius-GAS, soleus-SOL). During walking, the TS muscles undergo different fascicle kinematics and contribute differently to biomechanical subtasks. These differences may be facilitated by the Achilles tendon (AT), which is comprised of subtendons that originate from the TS muscles. We and others have revealed non-uniform displacement patterns within the AT-evidence for sliding between subtendons that may facilitate independent muscle actuation. However, in older adults, we have observed more uniform AT tissue displacements that correlate with reduced push-off intensity. Here, we employed dual-probe ultrasound imaging to investigate TS muscle length change heterogeneity (GAS-SOL) as a determinant of reduced push-off intensity in older adults. Compared to young, older adults walked with more uniform AT tissue displacements and reduced TS muscle length change heterogeneity. These muscle-level differences appeared to negatively impact push-off intensity-evidenced by between-group differences in the extent to which TS muscle length change heterogeneity correlates with mechanical output across walking tasks. Our findings suggest that the capacity for sliding between subtendons may facilitate independent TS muscle actuation in young adults but may restrict that actuation in older adults, likely contributing to reduced push-off intensity." @default.
• W3210155074 created "2021-11-08" @default.
• W3210155074 creator A5022259086 @default.
• W3210155074 creator A5084741309 @default.
• W3210155074 date "2021-10-28" @default.
• W3210155074 modified "2023-10-16" @default.
• W3210155074 title "Age-related changes to triceps surae muscle-subtendon interaction dynamics during walking" @default.
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• W3210155074 doi "https://doi.org/10.1038/s41598-021-00451-y" @default.
• W3210155074 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8553842" @default.
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• W3210155074 hasPublicationYear "2021" @default.
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