2016
DOI: 10.1055/s-0042-108198
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Influence of Age and Pathology on Achilles Tendon Properties During a Single-leg Jump

Abstract: Prevalence of Achilles tendinopathy increases with age leading to a weaker tendon with predisposition to rupture. Conclusive evidence of the influence of age and pathology on Achilles tendon (AT) properties remains limited, as previous studies are based on standardized isometric conditions. The study investigates the influence of age and pathology on AT properties during single-leg vertical jump (SLVJ). 10 children (C), 10 asymptomatic adults (A), and 10 tendinopathic patients (T) were included. AT elongation … Show more

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Cited by 18 publications
(14 citation statements)
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“…In addition, AT-thickness was shown to be on adult athletes' level (Hirschmüller et al, 2010 ; Cassel et al, 2016 ), indicating that maximum AT thickness is already determined by the age of 12 years. It was previously argued that an increased tendon thickness results from an adaptation to increased force generation capacity, i.e., due to higher body/muscle mass, leading also to increased stiffness of its structure (Intziegianni et al, 2016 ; Kulig et al, 2016 ). Taking results of the present study into account it can be hypothesized that tendons might adapt to higher forces by changes on micro-morphological level (Kulig et al, 2016 ), leading to higher fiber density, which was not analyzed in the present study.…”
Section: Discussionmentioning
confidence: 99%
“…In addition, AT-thickness was shown to be on adult athletes' level (Hirschmüller et al, 2010 ; Cassel et al, 2016 ), indicating that maximum AT thickness is already determined by the age of 12 years. It was previously argued that an increased tendon thickness results from an adaptation to increased force generation capacity, i.e., due to higher body/muscle mass, leading also to increased stiffness of its structure (Intziegianni et al, 2016 ; Kulig et al, 2016 ). Taking results of the present study into account it can be hypothesized that tendons might adapt to higher forces by changes on micro-morphological level (Kulig et al, 2016 ), leading to higher fiber density, which was not analyzed in the present study.…”
Section: Discussionmentioning
confidence: 99%
“…As the stiffness of its structures depends on its dimensions, it could be speculated that the higher compliance in CSA found in females is attributable to their smaller structures. However, this relationship is quite ambiguous 27 as there are studies which have shown that stiffness in tendons is independent of its dimensions 18 34 36 . Hence other factors such as tendon micro-structure could be assumed to also play a role, e. g. increased fibril diameter, fibril packing 33 , collagen cross-linking 2 and reduced collagen crimping 21 .…”
Section: Discussionmentioning
confidence: 99%
“…The probe was place on the defined point on the AT by the investigator and three image scans were taken. For warm-up and familiarisation with the measurement procedure, a standardized warm-up protocol was chosen consisting of three submaximal and two maximal isometric plantar flexion contractions of 5 s, with 1 min rest in between 1 17 18 . After these practice trials, participants performed 3 maximal isometric plantar flexion contractions of 3 s with 1 min rest.…”
Section: Methodsmentioning
confidence: 99%
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“…Intratendinous alterations were rarely detected in ATs of athletes as well as in controls. High compliance of tendon tissue before and during the pubertal phase may play an important role in protecting ATs from pathology [18,32]. In contrast, the incidence of intratendinous alterations in PTs was substantially higher.…”
Section: Incidence Of Intratendinous Alterationsmentioning
confidence: 95%