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Human calf muscles changes after strength training as revealed by diffusion tensor imaging.

Daniele Bruschetta1, Giuseppe Anastasi1, Veronica Andronaco2

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Strength training significantly increased diffusion parameters and calf muscle volume in young men. Diffusion tensor imaging (DTI) effectively tracks these microstructural changes in skeletal muscle.

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Area of Science:

  • Biomedical Engineering
  • Musculoskeletal Imaging
  • Sports Science

Background:

  • Diffusion Tensor Imaging (DTI) is a non-invasive MRI technique for muscle anatomy analysis.
  • DTI parameters assess microstructural changes related to demographics and exercise.
  • This study investigates calf muscle diffusion parameter changes after a 3-month strength training program.

Purpose of the Study:

  • To evaluate the impact of a 3-month strength training protocol on human calf muscle diffusion parameters.
  • To assess changes in muscle volume and microstructure using DTI.

Main Methods:

  • Ten young men underwent a 3-month strength training program for medial (GCM), lateral gastrocnemius (GCL), and soleus (SL) muscles.
  • Diffusion-weighted MRI scans were acquired pre-training (TPRE) and post-training (TPOST) at 3T.
  • Fractional anisotropy (FA), mean diffusivity (MD), and tensor eigenvalues (λ1, λ2, λ3) were calculated.

Main Results:

  • Significant increases in λ1, λ2, λ3, and MD values were observed in all calf muscles (left and right sides) post-training.
  • Muscle volumes also showed significant increases between TPRE and TPOST.
  • No significant changes in FA were detected.

Conclusions:

  • DTI is a valuable tool for assessing skeletal muscle microstructure and its response to training.
  • Diffusion parameter variations can indicate physiological and pathological changes in muscle tissue.
  • DTI can be used to evaluate the effectiveness of training protocols.