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A diffusion tensor imaging analysis of gender differences in water diffusivity within human skeletal muscle
Craig J Galbán1, Stefan Maderwald, Kai Uffmann
1Department of Diagnostic and Interventional Radiology, University Hospital Essen, Hufelandstrasse 55, D-45122 Essen, Germany. galbanc@ors.od.nih.gov
NMR in Biomedicine
|August 3, 2005
Summary
Male and female calf muscles show distinct diffusive properties at rest. Diffusion Tensor Imaging (DTI) revealed sex-based differences in muscle fiber characteristics, with males exhibiting higher anisotropy.
Area of Science:
- Biomedical Engineering
- Musculoskeletal Imaging
- Human Physiology
Background:
- Understanding skeletal muscle's diffusive properties is crucial for diagnosing and treating various conditions.
- Diffusion Tensor Imaging (DTI) offers a non-invasive method to assess tissue microstructure.
- Previous research has not extensively explored sex-based differences in calf muscle diffusion characteristics.
Purpose of the Study:
- To investigate and compare the diffusive properties of adjacent calf muscles at rest between males and females using DTI.
- To derive and apply a mathematical model relating diffusion tensor eigenvalues to muscle fiber volume fraction.
- To identify potential sex-based discrepancies in muscle microstructure and their implications.
Main Methods:
- Diffusion Tensor Imaging (DTI) was performed on the left calf of 12 male and 12 female subjects at rest.
- Key diffusion parameters including eigenvalues, trace of the diffusion tensor [Tr(D)], ellipsoid eccentricity (e), and fractional anisotropy (FA) were calculated for seven calf muscles.
- A mathematical model was developed to correlate diffusion tensor eigenvalues with muscle fiber volume fraction.
Main Results:
- Females exhibited higher eigenvalues and Tr(D) in most calf muscles compared to males.
- Males demonstrated higher ellipsoid eccentricity (e) and fractional anisotropy (FA), particularly in large plantar flexor muscles.
- The mathematical model indicated a greater proportion of muscle fibers in males, aligning with experimental findings but highlighting unexplained gender discrepancies.
Conclusions:
- Significant sex-based differences exist in the diffusive properties and microstructural organization of human calf muscles at rest.
- DTI parameters like FA and e may serve as indicators of muscle fiber composition and anisotropy, varying between sexes.
- While the derived model offers insights into water diffusion limitations in skeletal muscle, further research is needed to elucidate the underlying causes of observed gender differences.