Non-uniform displacement and strain between the soleus and gastrocnemius subtendons of rat Achilles tendon

Scandinavian Journal of Medicine & Science in Sports
T FinniH Maas

Abstract

Achilles tendon (AT) comprises of 3 subtendons arising from the soleus (SOL) and the lateral (LG) and medial (MG) heads of the gastrocnemius muscle. While recent human studies show differential displacement within AT, these displacements have not been attributed to specific subtendons. We tested the hypothesis that the SOL and LG subtendons show differential displacement and strain during various combinations of SOL, LG, and MG excitations. Movement of knots, sutured onto SOL and LG subtendons of 12 Wistar rats, was videotaped, while the muscles were stimulated intramuscularly and ankle torque was assessed. When SOL only was stimulated, the plantar flexion torque was the smallest among the different conditions (P < .001). In this condition, from passive to active state, the displacement (0.57 vs 0.47 mm, P = .002) and strain (8.4% vs 2.4%, P < .001) in the SOL subtendon were greater than in LG subtendon. When LG only was stimulated, a higher ankle torque was measured as compared to SOL stimulation (P < .001); the displacement was similar in both subtendons (~0.6 mm), while the strain was greater in LG than in SOL (4.7% vs 1.7%, P < .001). When all 3 muscles were stimulated simultaneously, ankle torque was highest and the displa...Continue Reading

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Citations

Sep 22, 2018·The Journal of Experimental Biology·Marion CrouzierFrançois Hug
May 23, 2019·Connective Tissue Research·William H Clark, Jason R Franz
Feb 16, 2020·European Journal of Applied Physiology·Christian CouppéS Peter Magnusson
Apr 23, 2019·Translational Sports Medicine·Lauri StenrothJason Franz
Jun 7, 2018·Integrative and Comparative Biology·Chris TijsHuub Maas
Apr 13, 2019·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Andrea H Lee, Dawn M Elliott
Sep 4, 2018·BioMed Research International·Carolin GablerThomas Tischer
Aug 9, 2020·Frontiers in Bioengineering and Biotechnology·Connor C GainsHuub Maas
Jan 20, 2021·Scandinavian Journal of Medicine & Science in Sports·Ra'ad M KhairTaija Finni
Dec 22, 2020·Frontiers in Sports and Active Living·Geoffrey G HandsfieldVickie Shim
Sep 19, 2018·Journal of Biomechanics·Laura Chernak SlaneLennart Scheys
Jul 6, 2021·Frontiers in Sports and Active Living·Huub MaasJason R Franz
Jul 9, 2021·Journal of Anatomy·Hai-Ming FanYu-Long Sun
Aug 6, 2021·The Journal of Experimental Biology·Nathan L LehrJason R Franz

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