Non-uniform displacement and strain between the soleus and gastrocnemius subtendons of rat Achilles tendon
Finni Juutinen, T., Bernabei, M., Baan, G. C., Noort, W., Tijs, C., & Maas, H. (2018). Non-uniform displacement and strain between the soleus and gastrocnemius subtendons of rat Achilles tendon. Scandinavian Journal of Medicine and Science in Sports, 28(3), 1009-1017. https://doi.org/10.1111/sms.13001
Julkaistu sarjassa
Scandinavian Journal of Medicine and Science in SportsTekijät
Päivämäärä
2018Tekijänoikeudet
© John Wiley & Sons A/S., 2017. This is a final draft version of an article whose final and definitive form has been published by John Wiley & Sons A/S. Published in this repository with the kind permission of the publisher.
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 displacement (0.79 vs 0.74 mm, P = .002) and strain (7.7% vs 4.4%, P = .003) were greater in SOL than in LG. These data show that the different subtendons of AT can experience relative displacement and differential strains. Together with anatomical dissections, the results revealed that such uniformities may be due to a lower stiffness of SOL subtendon compared to LG.
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Wiley-Blackwell Publishing Ltd.ISSN Hae Julkaisufoorumista
0905-7188Asiasanat
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https://converis.jyu.fi/converis/portal/detail/Publication/27333334
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Non-uniformity of displacement and strain within the Achilles tendon is affected by joint angle configuration and differential muscle loading
Maas, Huub; Noort, Wendy; Baan, Guus C.; Finni, Taija (Elsevier, 2020)Although the Achilles tendon (AT) has been studied for more than a century, a complete understanding of the mechanical and functional consequences of AT structural organization is currently lacking. The aim of this study ... -
Acute effects of isometric plantarflexion exercise on Achilles tendon non-uniform displacement
Parkkola, Roosa (2024)The non-uniformity is a function of a healthy tendon and has been seen decreased among injured and aging populations. The purpose of this study was to detect acute changes in Achilles tendon (AT) non-uniformity in response ... -
In vivo localized gastrocnemius subtendon representation within the healthy and ruptured human Achilles tendon
Khair, Raad M.; Stenroth, Lauri; Cronin, Neil J.; Reito, Aleksi; Paloneva, Juha; Finni, Taija (American Physiological Society, 2022)The Achilles tendon (AT) is composed of three distinct in-series elastic subtendons, arising from different muscles in the triceps surae. Independent activation of any of these muscles is thought to induce sliding between ... -
Approximation of pre-twisted Achilles sub-tendons with continuum-based beam elements
Obrezkov, Leonid; Bozorgmehri, Babak; Finni, Taija; Matikainen, Marko K. (Elsevier Inc., 2022)Achilles sub-tendons are materially and geometrically challenging structures that can nearly undergo around 15% elongation from their pre-twisted initial states during physical activities. Sub-tendons’ cross-sectional ... -
Biplanar ultrasound investigation of in vivo Achilles tendon displacement non-uniformity
Stenroth, Lauri; Thelen, Darryl; Franz, Jason (John Wiley & Sons Ltd., 2019)The Achilles tendon is a common tendon for the medial and lateral gastrocnemius and soleus muscles. Non‐uniform Achilles tendon regional displacements have been observed in vivo which may result from non‐uniform muscle ...
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