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Early detection of exercise-induced muscle damage using elastography.

Lilian Lacourpaille1,2, Antoine Nordez3, François Hug3,4,5

  • 1Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, University of Nantes, 25 bis boulevard Guy Mollet, BP 72206, 44322, Nantes Cedex 3, France. lilian.lacourpaille@univ-nantes.fr.

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Muscle shear modulus measured 30 minutes post-exercise accurately predicts force deficits 48 hours later. This non-invasive measure helps estimate exercise-induced muscle damage.

Keywords:
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Area of Science:

  • Exercise Physiology
  • Biomedical Engineering
  • Musculoskeletal Research

Background:

  • Eccentric exercise is known to induce muscle damage, leading to force deficits.
  • Assessing the extent of muscle damage is crucial for effective rehabilitation and training.
  • Current methods for evaluating muscle damage can be invasive or time-consuming.

Purpose of the Study:

  • To determine if muscle shear modulus, measured 30 minutes after eccentric exercise, correlates with force deficits observed 48 hours post-exercise.
  • To investigate the utility of shear modulus as a non-invasive indicator of exercise-induced muscle damage.

Main Methods:

  • Fifty-three healthy participants were divided into five groups.
  • Four groups underwent eccentric elbow flexion or knee extension exercises at low or high loads.
  • A control group performed concentric elbow flexions.

Main Results:

  • Eccentric exercises significantly reduced peak torque at 48 hours post-exercise (P < 0.001).
  • Muscle shear modulus increased significantly 30 minutes after eccentric exercise for both elbow flexors and knee extensors (P < 0.001).
  • The increase in shear modulus at 30 minutes strongly correlated with the decrease in peak torque at 48 hours (r = -0.80 for elbow, r = -0.82 for knee).

Conclusions:

  • An elevated muscle shear modulus 30 minutes post-exercise is a reliable indicator of the magnitude of force deficit at 48 hours.
  • Muscle shear modulus offers a valuable, non-invasive tool for coaches and clinicians to quantify exercise-induced muscle damage.
  • Specific muscles like biceps brachii and rectus femoris appear more susceptible to damage.