Distinct muscle-tendon interaction during running at different speeds and in different loading conditions

Publikationen: Beitrag in FachzeitschriftZeitschriftenaufsätzeForschungBegutachtung


  • Amelie Werkhausen
  • Neil J Cronin
  • Kirsten Albracht
  • Jens Bojsen-Møller
  • Olivier R Seynnes



The interaction between the Achilles tendon and the triceps surae muscles seems to be modulated differently with various task configurations. Here we tested the hypothesis that the increased forces and ankle joint work during running under contrasting conditions (altered speed or load) would be met by different, time-dependent adjustments at the muscle-tendon level. Ultrasonography, electromyography, kinematics and ground reaction force measurements were used to examine Achilles tendon, gastrocnemius and soleus muscle mechanics in sixteen runners in four different running conditions, consisting of a combination of two different speeds (preferred and +20% of preferred speed) and two loading conditions (unloaded and +20% of body mass). Positive ankle joint work increased similarly (+13%) with speed and load. Gastrocnemius and soleus muscle fascicle length and peak velocity were not altered by either condition, suggesting that contractile conditions are mostly preserved despite the constraints imposed in this experimental design. However, at higher running speed, tendon length changes were unaltered but mean muscle electromyographic activity increased in gastrocnemius (+10%, P<0.01) and soleus (+14%, P<0.01). Conversely, when loading was increased, mean muscle activity remained similar to unloaded conditions but the mean velocity of gastrocnemius fascicles was reduced and tendon recoil increased (+29%, P<0.01). Collectively, these results suggest that the neuromuscular system meets increased mechanical demands by favoring economical force production when enough time is available.

ZeitschriftJournal of applied physiology (Bethesda, Md. : 1985)
PublikationsstatusElektronische Veröffentlichung vor Drucklegung. - 2019

Bibliographische Notiz

Online: 19.05.2019

ID: 4017140


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