Do triceps surae muscle dynamics govern non-uniform Achilles tendon deformations?

PeerJ
William H Clark, Jason R Franz

Abstract

The human Achilles tendon (AT) consists of sub-tendons arising from the gastrocnemius and soleus muscles that exhibit non-uniform tissue displacements thought to facilitate some independent actuation. However, the mechanisms governing non-uniform displacement patterns within the AT, and their relevance to triceps surae muscle contractile dynamics, have remained elusive. We used a dual-probe ultrasound imaging approach to investigate triceps surae muscle dynamics (i.e., medial gastrocnemius-GAS, soleus-SOL) as a determinant of non-uniform tendon tissue displacements in the human AT. We hypothesized that superficial versus deep differences in AT tissue displacements would be accompanied by and correlate with anatomically consistent differences in GAS versus SOL muscle shortening. Nine subjects performed ramped maximum voluntary isometric contractions at each of five ankle joint angles spanning 10° dorsiflexion to 30° plantarflexion. For all conditions, SOL shortened by an average of 78% more than GAS during moment generation. This was accompanied by, on average, 51% more displacement in the deep versus superficial region of the AT. The magnitude of GAS and SOL muscle shortening positively correlated with displacement in their ass...Continue Reading

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Citations

Jan 25, 2019·Journal of Applied Biomechanics·William H Clark, Jason R Franz
May 23, 2019·Connective Tissue Research·William H Clark, Jason R Franz
Nov 27, 2019·Medicine and Science in Sports and Exercise·Marion CrouzierFrançois Hug
Apr 23, 2019·Translational Sports Medicine·Lauri StenrothJason Franz
May 20, 2021·Journal of Biomechanical Engineering·Giorgos KrikelisLaura-Anne M Furlong
Aug 6, 2021·The Journal of Experimental Biology·Nathan L LehrJason R Franz

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Methods Mentioned

BETA
imaging technique

Software Mentioned

UltraTrack
MATLAB

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