{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,3]],"date-time":"2026-11-03T12:45:48Z","timestamp":1793709948806,"version":"4.6.1"},"reference-count":68,"publisher":"Human Kinetics","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,8,1]]},"abstract":"<jats:p>Ankle joint quasi-stiffness is an aggregate measure of the interaction between triceps surae muscle stiffness and Achilles tendon stiffness. This interaction may be altered due to age-related changes in the structural properties and functional behavior of the Achilles tendon and triceps surae muscles. The authors hypothesized that, due to a more compliant of Achilles\u2019 tendon, older adults would exhibit lower ankle joint quasi-stiffness than young adults during walking and during isolated contractions at matched triceps surae muscle activations. The authors also hypothesized that, independent of age, triceps surae muscle stiffness and ankle joint quasi-stiffness would increase with triceps surae muscle activation. The authors used conventional gait analysis in one experiment and, in another, electromyographic biofeedback and <jats:italic>in vivo<\/jats:italic> ultrasound imaging applied during isolated contractions. The authors found no difference in ankle joint quasi-stiffness between young and older adults during walking. Conversely, this study found that (1)\u00a0young and older adults modulated ankle joint quasi-stiffness via activation-dependent changes in triceps surae muscle length\u2013tension behavior and (2)\u00a0at matched activation, older adults exhibited lower ankle joint quasi-stiffness than young adults. Despite age-related reductions during isolated contractions, ankle joint quasi-stiffness was maintained in older adults during walking, which may be governed via activation-mediated increases in muscle stiffness.<\/jats:p>","DOI":"10.1123\/jab.2019-0340","type":"journal-article","created":{"date-parts":[[2020,6,5]],"date-time":"2020-06-05T10:46:58Z","timestamp":1591354018000},"page":"209-216","source":"Crossref","is-referenced-by-count":11,"title":["Older Adults Overcome Reduced Triceps Surae Structural Stiffness to Preserve Ankle Joint Quasi-Stiffness During Walking"],"prefix":"10.1123","volume":"36","author":[{"given":"Rebecca L.","family":"Krupenevich","sequence":"first","affiliation":[{"name":"1University of North Carolina at Chapel Hill and North Carolina State University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William H.","family":"Clark","sequence":"additional","affiliation":[{"name":"1University of North Carolina at Chapel Hill and North Carolina State 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