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In Vivo Evaluation of the Mechanical and Viscoelastic Properties of the Rat Tongue
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Trapezius viscoelastic properties are heterogeneously affected by eccentric exercise.

Adam Kawczyński1, Dariusz Mroczek2, Rasmus Elbæk Andersen3

  • 1Department of Paralympics Sports, University School of Physical Education, Poland.

Journal of Science and Medicine in Sport
|February 4, 2018
PubMed
Summary

Eccentric exercise (ECC) alters upper trapezius muscle properties differently. Stiffness and creep changes varied between the muscle belly and musculotendinous sites 24 hours post-exercise.

Keywords:
Eccentric exerciseMuscle stiffnessMuscle viscoelastic propertiesUpper trapezius

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Musculoskeletal Research

Background:

  • Eccentric exercise (ECC) is known to induce muscle damage and soreness.
  • Understanding the viscoelastic changes in muscles post-ECC is crucial for rehabilitation and training.
  • The upper trapezius muscle is frequently affected by postural strain and exercise.

Purpose of the Study:

  • To investigate the influence of eccentric exercise on the spatial mapping of muscle stiffness and creep in the upper trapezius.
  • To quantitatively assess changes in viscoelastic properties using myotonometry.
  • To explore the differential effects of ECC on muscle belly versus musculotendinous regions.

Main Methods:

  • Two groups of 16 subjects underwent myotonometry assessments.
  • Test-retest reliability of muscle stiffness and creep was established.
  • Muscle stiffness and creep were mapped before, immediately after, and 24 hours after an ECC protocol.

Main Results:

  • Measurements of muscle stiffness and creep demonstrated substantial to almost perfect reliability.
  • Muscle stiffness increased at musculotendinous sites 24h post-ECC, but decreased at the muscle belly immediately and 24h after ECC.
  • Muscle creep decreased at musculotendinous sites and increased at the muscle belly immediately and 24h after ECC.

Conclusions:

  • Eccentric exercise induces distinct changes in upper trapezius viscoelasticity.
  • Opposite alterations in stiffness and creep were observed between the muscle belly and musculotendinous sites.
  • These findings highlight the complex, spatially dependent response of muscle tissue to eccentric loading.