@article{WerkhausenAlbrachtCroninetal.2018, author = {Werkhausen, Amelie and Albracht, Kirsten and Cronin, Neil J and Paulsen, G{\o}ran and Bojsen-M{\o}ller, Jens and Seynnes, Olivier R}, title = {Effect of training-induced changes in achilles tendon stiffness on muscle-tendon behavior during landing}, series = {Frontiers in physiology}, journal = {Frontiers in physiology}, number = {9}, publisher = {Frontiers Research Foundation}, address = {Lausanne}, issn = {1664-042X}, doi = {10.3389/fphys.2018.00794}, pages = {11 Seiten}, year = {2018}, abstract = {During rapid deceleration of the body, tendons buffer part of the elongation of the muscle-tendon unit (MTU), enabling safe energy dissipation via eccentric muscle contraction. Yet, the influence of changes in tendon stiffness within the physiological range upon these lengthening contractions is unknown. This study aimed to examine the effect of training-induced stiffening of the Achilles tendon on triceps surae muscle-tendon behavior during a landing task. Twenty-one male subjects were assigned to either a 10-week resistance-training program consisting of single-leg isometric plantarflexion (n = 11) or to a non-training control group (n = 10). Before and after the training period, plantarflexion force, peak Achilles tendon strain and stiffness were measured during isometric contractions, using a combination of dynamometry, ultrasound and kinematics data. Additionally, testing included a step-landing task, during which joint mechanics and lengths of gastrocnemius and soleus fascicles, Achilles tendon, and MTU were determined using synchronized ultrasound, kinematics and kinetics data collection. After training, plantarflexion strength and Achilles tendon stiffness increased (15 and 18\%, respectively), and tendon strain during landing remained similar. Likewise, lengthening and negative work produced by the gastrocnemius MTU did not change detectably. However, in the training group, gastrocnemius fascicle length was offset (8\%) to a longer length at touch down and, surprisingly, fascicle lengthening and velocity were reduced by 27 and 21\%, respectively. These changes were not observed for soleus fascicles when accounting for variation in task execution between tests. These results indicate that a training-induced increase in tendon stiffness does not noticeably affect the buffering action of the tendon when the MTU is rapidly stretched. Reductions in gastrocnemius fascicle lengthening and lengthening velocity during landing occurred independently from tendon strain. Future studies are required to provide insight into the mechanisms underpinning these observations and their influence on energy dissipation.}, language = {en} } @article{YangKriechbaumerAlbrachtetal.2014, author = {Yang, Peng-Fei and Kriechbaumer, Andreas and Albracht, Kirsten and Sanno, Maximilian and Ganse, Bergita and Koy, Timmo and Shang, Peng and br{\"u}ggemann, Gert-Peter and M{\"u}ller, Lars Peter and Rittweger, J{\"o}rn}, title = {A novel optical approach for assessing in vivo bone segment deformation and its application in muscle-bone relationship studies in humans}, series = {Journal of Orthopaedic Translation}, volume = {2}, journal = {Journal of Orthopaedic Translation}, number = {4}, publisher = {Elsevier}, address = {Singapore}, issn = {2214-0328}, doi = {10.1016/j.jot.2014.07.078}, pages = {238 -- 238}, year = {2014}, language = {en} } @misc{OPUS4-10951, title = {Richtlinie zur Durchf{\"u}hrung von Sonderveranstaltungen in den Geb{\"a}uden und Liegenschaften der FH Aachen (Veranstaltungsrichtlinie) : vom 20. November 2019}, organization = {FH Aachen}, pages = {21 Seiten}, year = {2019}, language = {de} } @misc{OPUS4-10952, title = {Richtlinie zur Durchf{\"u}hrung von Sonderveranstaltungen in den Geb{\"a}uden und Liegenschaften der FH Aachen (Veranstaltungsrichtlinie) : vom 20. November 2019 Anlage 1 aktualisiert am 22. Januar 2020}, organization = {FH Aachen}, pages = {21 Seiten}, year = {2019}, language = {de} } @misc{OPUS4-10953, title = {Richtlinie f{\"u}r die Besch{\"a}ftigung und Verg{\"u}tung studentischer und wissenschaftlicher Hilfskr{\"a}fte an der Fachhochschule Aachen : vom 20. November 2019}, organization = {FH Aachen}, pages = {6 Seiten}, year = {2019}, language = {de} } @misc{OPUS4-10954, title = {Richtlinie f{\"u}r die Besch{\"a}ftigung und Verg{\"u}tung studentischer und wissenschaftlicher Hilfskr{\"a}fte an der Fachhochschule Aachen : vom 20. November 2019 aktualisiert am 24. November 2022}, organization = {FH Aachen}, pages = {6 Seiten}, year = {2019}, language = {de} } @misc{OPUS4-10955, title = {Gleichstellungsquoten der FH Aachen f{\"u}r die Jahre 2019 -2021 : vom 20. November 2019}, organization = {FH Aachen}, pages = {2 Seiten}, year = {2019}, language = {de} } @misc{OPUS4-10956, title = {Ordnung zur Aufhebung der Pr{\"u}fungsordnungen f{\"u}r den Masterstudiengang „Nuclear Applications" vom 13. Februar 2004 (FH-Mitteilung Nr. 5/2004) und vom 25. Februar 2010 (FH-Mitteilung Nr. 15/2010) in den Fassungen der Bekanntmachung der {\"A}nderungsordnungen vom 6. November 2012 (FH-Mitteilung Nr. 120/2012), 18. Juni 2014 (FH- Mitteilung Nr. 72/2014) und vom 15. Juni 2015 (FH-Mitteilung Nr. 28/2015) : vom 29. November 2019}, organization = {FH Aachen}, pages = {3 Seiten}, year = {2019}, language = {de} } @misc{OPUS4-10957, title = {5. Ordnung zur {\"A}nderung der Pr{\"u}fungsordnung f{\"u}r die Bachelorstudieng{\"a}nge „Betriebswirtschaft Praxis Plus" und „Betriebswirtschaft Praxis Plus (Teilzeit)" mit dem Studienabschluss „Bachelor of Science" am Fachbereich Wirtschaftswissenschaften der Fachhochschule Aachen (PO - BWL Praxis Plus) : vom 29. November 2019}, organization = {FH Aachen}, pages = {2 Seiten}, year = {2019}, language = {de} } @misc{OPUS4-10958, title = {Pr{\"u}fungsordnung f{\"u}r die Bachelorstudieng{\"a}nge „Betriebswirtschaft Praxis Plus" und „Betriebswirtschaft Praxis Plus (Teilzeit)" mit dem Studienabschluss „Bachelor of Science" am Fachbereich Wirtschaftswissenschaften der Fachhochschule Aachen (PO-BWL Praxis Plus) : vom 14. Januar 2014 - FH-Mitteilung Nr. 2/2014 in der Fassung der Bekanntmachung der {\"A}nderungsordnung vom 29. November 2019 - FH-Mitteilung Nr. 128/2019 (Nichtamtliche lesbare Fassung | Studienbeginn ab WS 2019/20)}, organization = {FH Aachen}, pages = {11 Seiten}, year = {2019}, language = {de} }