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Measuring changes in muscle stiffness after eccentric exercise using elastography.

M A Green1, R Sinkus, S C Gandevia

  • 1Neuroscience Research Australia, Randwick, NSW, 2031, Australia.

NMR in Biomedicine
|January 17, 2012
PubMed
Summary
This summary is machine-generated.

Eccentric exercise increases muscle stiffness, measured directly for the first time using Magnetic Resonance Elastography (MRE). This noninvasive technique tracked changes in passive muscle elasticity following exercise.

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Area of Science:

  • Biomechanics
  • Musculoskeletal System
  • Medical Imaging

Background:

  • Muscle stiffness is known to increase after eccentric exercise.
  • Previous measurements of muscle stiffness have relied on indirect methods.
  • Understanding these changes is crucial for rehabilitation and performance.

Purpose of the Study:

  • To directly measure passive elasticity changes in skeletal muscles after eccentric exercise.
  • To investigate the time-course of these elasticity changes using Magnetic Resonance Elastography (MRE).
  • To assess changes in shear storage modulus (G') and loss modulus (G'') in the medial gastrocnemius and soleus muscles.

Main Methods:

  • Utilized Magnetic Resonance Elastography (MRE), a noninvasive imaging technique.
  • Measured shear storage modulus (G') and loss modulus (G'') in vivo.
  • Included eight healthy subjects, assessing muscles before, 1 hour, 48 hours, and 1 week post-exercise.

Main Results:

  • Observed a 21% increase in medial gastrocnemius shear storage modulus (G') after eccentric exercise.
  • The peak increase in G' for the medial gastrocnemius occurred approximately 48 hours post-exercise.
  • No significant changes in soleus muscle G' or in the loss modulus (G'') for either muscle were detected.

Conclusions:

  • Magnetic Resonance Elastography (MRE) provides direct, noninvasive measurements of muscle elasticity changes.
  • Eccentric exercise induces time-dependent alterations in passive muscle stiffness, particularly in the medial gastrocnemius.
  • MRE is a viable tool for monitoring the effects of exercise-induced muscle damage on mechanical properties.