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Bispebjerg Hospital - en del af Københavns Universitetshospital
E-pub ahead of print

Six-weeks of intensive rehearsals for the Swan Lake ballet shows ultrasound tissue characterization changes of the Achilles tendons in dancers

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

DOI

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  • Charlotte Anker-Petersen
  • Birgit Juul-Kristensen
  • Jarrod Antflick
  • Henrik Aagaard
  • Christopher Myers
  • Anders Ploug Boesen
  • Eleanor Boyle
  • Per Hölmich
  • Kristian Thorborg
Vis graf over relationer

The objective was to investigate, first, whether six weeks of intensive ballet dance exposure is associated with structural and clinical changes in the Achilles tendon; second, the importance of demographics, self-reported Achilles pain, and generalized joint hypermobility (GJH). Data were collected at baseline and at six weeks' follow-up, using Achilles tendon ultrasound tissue characteristics (UTC) as primary outcome (percentage distribution of echo-type I-IV: type I = intact and aligned bundles, type II = discontinuous/wavy bundles, type III = fibrillar, and type IV = amorphous cells/fluid). Secondary outcomes included clinical signs of Achilles tendinopathy, Achilles tendon pain during single-leg heel raise, self-reported symptoms (VISA-A questionnaire), and GJH. Sixty-three ballet dancers (aged 18-41) participated. From baseline to follow-up, UTC echo-type I decreased significantly (β = -3.6, p = 0.001; 95% CI: -5.8;-1.4), whereas echo-type II increased significantly (β = 3.2, p < 0.0001, 95% CI: 1.6;4.8). Furthermore, a significant effect of limb (left limb showed decreased echo-type I and increased echo-type III + IV) and sex (women showed decreased echo-type I and increased in type II) was found. No significant changes in the remaining secondary outcomes were found. Ballet dancers showed structural changes in UTC, corresponding to a decreased echo-type I distribution after six weeks of rehearsing for Swan Lake ballet. No changes in self-reported symptoms, clinical signs of Achilles tendinopathy, and single-leg heel raise test were seen from pre- to post-rehearsal. Thus, UTC changes in the Achilles tendon seem to appear earlier than clinical signs of tendinopathy.

OriginalsprogEngelsk
TidsskriftScandinavian journal of medicine & science in sports
Vol/bind31
Udgave nummer11
Sider (fra-til)2133-2143
Antal sider11
ISSN0905-7188
DOI
StatusE-pub ahead of print - 18 aug. 2021

ID: 67246699