title: Fatigue-induced changes in longitudinal relaxation time determined by magnetic resonance imaging.
abstract: Longitudinal relaxation time (T(1)) determined by 3.0-T magnetic resonance imaging of the tibialis anterior and extensor digitorum longus muscles increased gradually with muscle fatigue caused by three 120-s periods of repeated ankle dorsiflexion separated by 5-min rest periods. T(1) values decreased in the recovery period, although they remained higher than the preexercise values. T(1) values for the soleus muscle were unchanged throughout the experiment. Results suggest that muscle T(1) values increase with increasing muscle fatigue.
authors.affiliation: Department of Sports Sciences, Japan Institute of Sports Sciences, Tokyo, Japan. takahashi.kyohei@jiss.naash.go.jp
authors.forename: Kyohei
authors.initials: K
authors.lastname: Takahashi
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Tohdoh
authors.forename: Takeo
authors.initials: T
authors.lastname: Matsubayashi
authors.forename: Vladimír
authors.initials: V
authors.lastname: Jellúš
authors.forename: Katsuya
authors.initials: K
authors.lastname: Maruyama
mesh_terms: D000328:Adult; D000465:Algorithms; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D018763:Muscle Fatigue / Q000502:physiology*; D018482:Muscle, Skeletal / Q000033:anatomy & histology* / Q000502:physiology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity