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. 2020 Dec 16;11:607544. doi: 10.3389/fphys.2020.607544

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Copyright © 2020 Karamanidis and Epro.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Measurement locations at the Olympic training centers in Germany incl. study design (A) and the used custom-made analysis device (TEMULAB®, Protendon GmbH & Co. KG, Aachen, Germany) to assess TS MTU mechanical properties incorporating dynamometry and ultrasonography (B). In order to determine the force-elongation relationship of the tendon the displacement of the myotendinous junction (MTJ) of the m. gastrocnemius medialis (ΔL_measured) was digitized at rest (0%) and at three sustained contractions (target joint moment constantly held for 3s) at fixed target ankle joint moment levels (30, 50, and 80%; C).