Ontology type: schema:ScholarlyArticle Open Access: True
2016-09-30
AUTHORSThijs Maria Anne Ackermans, Gaspar Epro, Christopher McCrum, Kai Daniel Oberländer, Frank Suhr, Maarten Robert Drost, Kenneth Meijer, Kiros Karamanidis
ABSTRACTPurposeWe aimed to determine whether there are different changes in Achilles tendon (AT) mechanical properties in middle-aged, compared to younger runners that might indicate that tendon fatigue, induced by long-distance running, is age-dependent.Methods27 middle-aged (50–67 years) and 22 younger (21–29 years) participants ran a 21 km route at their own pace (mean and SD: old: 3.1 ± 0.3 m s−1; young: 3.6 ± 0.5 m s−1). We tested for changes in the AT force–elongation relationship using dynamometry and ultrasonography during isometric voluntary ankle plantarflexion ramp contractions, conducted 20–28 h pre-run, immediately pre-run, immediately post-run and 20–28 h post-run. Stride frequency and number were examined to estimate cyclic tensile loading characteristics of the tendon during running.ResultsMuscle strength decreased significantly (P < 0.05) in both groups immediately post-run (old: 17 %; young: 11 %) and recovered to baseline within 20–28 h post-run. AT stiffness did not change for the younger adults, whereas the middle-aged adults showed a significant (P < 0.05) decrease in AT stiffness (22 %). However, tendon stiffness recovered to baseline 20–28 h post-run. Middle-aged, compared to young adults, demonstrated significantly (P < 0.05) greater stride frequency and number, but no correlations with tendon fatigue changes were determined (R2 ≤ 0.038).ConclusionsThe results suggest that the plasticity of the AT in response to short-term mechanical loading may be age dependent and that the AT length–tension properties of middle-aged runners may be more vulnerable to change following running compared to younger athletes. However, the observed AT changes in the middle-aged runners dissipated within 20–28 h post-run, suggesting that a tendon viscoelastic recovery mechanism may occur in vivo. More... »
PAGES2281-2292
http://scigraph.springernature.com/pub.10.1007/s00421-016-3482-z
DOIhttp://dx.doi.org/10.1007/s00421-016-3482-z
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/27695979
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