title: Acute change of exercised muscle using magnetization transfer contrast MR imaging.
abstract: We evaluated the acute changes in exercised muscle using magnetization transfer contrast (MTC) MR imaging with a short repetition time sequence. Ten volunteers performed supine ankle dorsiflexion exercise. MTC gradient-recalled echo (GRE) images were obtained before and after exercise at 1.5 T. The effect of MTC was assessed by dividing the signal intensity on MTC GRE images by that on conventional GRE images (M(s)/M0). The signal intensity, M(s)/M0 and cross-sectional area of exercised muscle were all greater at 1-2 min after exercise than immediately after exercise. We propose that this additional increase in these parameters after exercise was due to physiological reflow or hyperemia. Since the M(s)/M0 showed a good correlation with free water content in exercised muscle, this ratio may provide a quantitative variable for evaluating dynamic change of water-macromolecule interaction in skeletal muscle.
authors.affiliation: Department of Radiology, University of Tsukuba, Ibaraki, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yoshioka
authors.forename: H
authors.initials: H
authors.lastname: Takahashi
authors.forename: H
authors.initials: H
authors.lastname: Onaya
authors.forename: I
authors.initials: I
authors.lastname: Anno
authors.forename: M
authors.initials: M
authors.lastname: Niitsu
authors.forename: Y
authors.initials: Y
authors.lastname: Itai
mesh_terms: D000273:Adipose Tissue / Q000502:physiology; D000328:Adult; D001834:Body Water / Q000502:physiology; D006801:Humans; D006940:Hyperemia / Q000503:physiopathology; D007089:Image Enhancement / Q000379:methods*; D007537:Isometric Contraction / Q000502:physiology; D046911:Macromolecular Substances; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008280:Magnetics; D008297:Male; D009126:Muscle Relaxation / Q000502:physiology; D018482:Muscle, Skeletal / Q000098:blood supply / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D012039:Regional Blood Flow / Q000502:physiology; D015203:Reproducibility of Results; D016683:Supine Position; D013997:Time Factors
chemical_list: D046911:Macromolecular Substances