In vivo localised gastrocnemius subtendon representation within the healthy and ruptured human Achilles tendon
Khair, R. M., Stenroth, L., Cronin, N. J., Reito, A., Paloneva, J., & Finni, T. (2022). In vivo localised gastrocnemius subtendon representation within the healthy and ruptured human Achilles tendon. Journal of Applied Physiology, in Press. https://doi.org/10.1152/japplphysiol.00084.2022
Published inJournal of Applied Physiology
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© 2022, Journal of Applied Physiology
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 the adjacent AT subtendons. We aimed to investigate displacement patterns during voluntary contraction (VOL) and selective transcutaneous stimulation of medial (MGstim) and lateral (LGstim) gastrocnemius between ruptured and healthy tendons, and to examine the representative areas of AT subtendons. Twenty-eight patients with unilateral AT rupture performed bilateral VOL at 30% of the maximal isometric un-injured plantarflexion torque. AT displacement was analysed from sagittal B-mode ultrasonography images during VOL, MGstim and LGstim. Three-way ANOVA revealed a significant two-way interaction of contraction type*location on the tendon displacement (F(10-815)=3.72, p<0.001). The subsequent two-way analysis revealed a significant contraction type*location interaction for tendon displacement (F(10-410)=3.79, p<0.001) in the un-injured limb only, where LGstim displacement pattern was significantly different from MGstim (p=0.008) and VOL (p=0.005). When comparing contraction types between limbs the there were no difference in the displacement patterns, but displacement amplitudes differed. There was no significant difference in the location of maximum or minimum displacement between limbs. The displacement pattern was not different in non-surgically treated compared to un-injured tendons one-year post rupture. Our results suggest that near the calcaneus, LG subtendon is located in the most anterior region adjacent to medial gastrocnemius. However, free tendon stiffness seems to be lower in the injured AT, leading to more displacement during electrically-induced contractions compared to the un-injured. ...
PublisherAmerican Physiological Society
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- Liikuntatieteiden tiedekunta 
Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingThis study was funded by Academy of Finland grant #323168, UNderstanding REStoration of Achilles Tendon function after rupture (UNRESAT), and in part by Academy of Finland grant #332915.
Showing items with similar title or keywords.
Khair, Ra’ad M.; Stenroth, Lauri; Péter, Annamária; Cronin, Neil J.; Reito, Aleksi; Paloneva, Juha; Finni, Taija (Wiley, 2021)The purpose of this study was investigate tendon displacement patterns in non‐surgically treated patients 14 months after acute Achilles tendon rupture (ATR) and to classify patients into groups based on their Achilles ...
Masood, Tahir (University of Jyväskylä, 2015)
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 ...
Muscle-tendon morphomechanical properties of non-surgically treated Achilles tendon 1-year post-rupture Khair, Ra'ad M.; Stenroth, Lauri; Cronin, Neil J.; Reito, Aleksi; Paloneva, Juha; Finni, Taija (Elsevier BV, 2022)Background Achilles tendon rupture appears to alter stiffness and length of the tendon. These alterations may affect the function of tendon in force transmission and in energy storage and recovery. We studied the mechanical ...
Peltonen, Jussi (University of Jyväskylä, 2014)