The interfascicular matrix enables fascicle sliding and recovery in tendon, and behaves more elastically in energy storing tendons.
- Journal Article
- Research Support
- Non-U.S. Gov't
Summary
The research looks into how energy storing tendons work more efficiently due to their elasticity and ability to recover from extreme strains, attributed to an element called the interfascicular matrix (IFM). It also notes how ageing affects the function of the IFM, making it stiffer and therefore making older tendons more prone to injury.
Investigation of Tendon Functions
The researchers first acknowledged the primary function of all tendons, which is to transfer the force between muscles and bones, positioning the limbs appropriately. They then discussed a special function found in some tendons, where they also work as energy stores, reducing the energy cost during locomotion. These types of tendons, called energy-storing tendons, can withstand highly extreme strains and recoil efficiently for maximum energy storage and return.
- The researchers compared the energy storing superficial digital flexor tendon (SDFT) and the positional common digital extensor tendon (CDET) in a horse’s forelimb.
- Notably, the SDFT has higher failure strains than CDET. However, the difference does not lie in the properties of the fascicles- the largest tendon subunits of these tendons.
- Rather, the reason for SDFT’s higher resilience is ascribed to the greater capacity for interfascicular sliding enabled by the interfascicular matrix (IFM), which assists the extended extensions in this particular tendon.
Focus on Interfascicular Matrix (IFM)
The researchers then focused on the IFM, subjecting it and fascicles from the SDFT and CDET to cyclical loading followed by a failure test.
- The results showed that the more elastic behavior of the IFM in the SDFT was not due to irreversible deformation.
- Rather, the IFM has the ability to withstand cyclic loading. In other words, it can endure repeated strain without breaking.
- Additionally, the IFM was found to be more resilient or elastic in the SDFT than in the CDET.
Impact of Ageing on IFM and Tendons
The researchers also studied the impact of ageing on IFM properties, which can affect tendon resilience.
- Findings showed that as IFM ages, its ability to resist repetitive loading diminishes, which consequently causes it to become stiffer.
- This increased stiffness with age was particularly noted in the SDFT.
- Thus, the study concluded that ageing alters the IFM properties, which can compromise its function, making older tendons susceptible to injuries.
Cite This Article
Publication
Researcher Affiliations
- Institute of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS UK. Electronic address: c.thorpe@qmul.ac.uk.
- Institute of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS UK.
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK.
- Institute of Orthopaedics and Musculoskeletal Science, University College London, Royal National Orthopaedic Hospital, Stanmore HA7 4LP, UK.
- Department of Musculoskeletal Biology, Institute of Ageing and Chronic Disease, University of Liverpool, Leahurst Campus, Neston CH64 7TE, UK.
- Institute of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS UK.
MeSH Terms
- Aging
- Animals
- Elasticity
- Energy Metabolism
- Forelimb
- Horses
- Materials Testing
- Tendons / metabolism
Grant Funding
- MR/K006312/1 / Medical Research Council
- BB/K008412 / Biotechnology and Biological Sciences Research Council
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