Alterations of the proton-T2 time in relaxed skeletal muscle induced by passive extremity flexions. Rump, J., Braun, J., Papazoglou, S., Taupitz, M., Sack, & c, I. Journal of Magnetic Resonance Imaging, 23(4):541-546, 2006. cited By (since 1996)5
Alterations of the proton-T2 time in relaxed skeletal muscle induced by passive extremity flexions [link]Paper  doi  abstract   bibtex   
Purpose: To demonstrate reciprocal changes of the apparent proton-T2 time in the biceps and triceps due to passive contraction and extension of the muscle fibers. Materials and Methods: The contraction state of the upper arm muscles of six healthy volunteers was passively changed by alternating the forearm position between the straight-arm position and an elbow flexion of 90°. The relaxation of the muscle during passive contraction and extension was measured with the use of muscle electromyography (EMG) experiments. Spin-echo (SE) MRI with increasing echo times (TEs) of 12-90 msec was used to acquire the averaged signal decay of the segmented biceps and triceps. The apparent T2 was deduced using monoexponential least-square fitting. Results: The median T2 alterations in biceps and triceps among all volunteers were found to be 1.2 and -1.3 msec in the straight and bent forearm positions, respectively. The confidence intervals (0.5 to 1.7 msec in biceps, and -2.6 to -1.1 msec in triceps) clearly indicate that proton-T2 in MR : images Is significantly (P < 0.05) prolonged with muscle contraction. Conclusion: The observed increase of the proton-T2 time was correlated with a passive contraction of skeletal muscle fibers. This passive effect can be attributed to changes in the intracellular water mobility corresponding to the well-known "active" T2 increase that occurs after stimulation of muscle. © 2006 Wiley-Liss, Inc.
@article{ Rump2006541,
  author = {Rump, J.a  and Braun, J.b  and Papazoglou, S.a  and Taupitz, M.a  and Sack, I.a  c },
  title = {Alterations of the proton-T2 time in relaxed skeletal muscle induced by passive extremity flexions},
  journal = {Journal of Magnetic Resonance Imaging},
  year = {2006},
  volume = {23},
  number = {4},
  pages = {541-546},
  note = {cited By (since 1996)5},
  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33645677712&partnerID=40&md5=06e97acec1424a0be7760baed5dd78e3},
  affiliation = {Institute of Radiology, Charité-University Medicine Berlin, Berlin, Germany; Institute of Medical Informatics, Charité-University Medicine Berlin, Berlin, Germany; Institute of Radiology, Charité-University Medicine Berlin, Humboldt University Berlin, Schumannstr. 20/21, 10117 Berlin, Germany},
  abstract = {Purpose: To demonstrate reciprocal changes of the apparent proton-T2 time in the biceps and triceps due to passive contraction and extension of the muscle fibers. Materials and Methods: The contraction state of the upper arm muscles of six healthy volunteers was passively changed by alternating the forearm position between the straight-arm position and an elbow flexion of 90°. The relaxation of the muscle during passive contraction and extension was measured with the use of muscle electromyography (EMG) experiments. Spin-echo (SE) MRI with increasing echo times (TEs) of 12-90 msec was used to acquire the averaged signal decay of the segmented biceps and triceps. The apparent T2 was deduced using monoexponential least-square fitting. Results: The median T2 alterations in biceps and triceps among all volunteers were found to be 1.2 and -1.3 msec in the straight and bent forearm positions, respectively. The confidence intervals (0.5 to 1.7 msec in biceps, and -2.6 to -1.1 msec in triceps) clearly indicate that proton-T2 in MR : images Is significantly (P &lt; 0.05) prolonged with muscle contraction. Conclusion: The observed increase of the proton-T2 time was correlated with a passive contraction of skeletal muscle fibers. This passive effect can be attributed to changes in the intracellular water mobility corresponding to the well-known "active" T2 increase that occurs after stimulation of muscle. © 2006 Wiley-Liss, Inc.},
  author_keywords = {Diffusion;  Muscle contraction;  Relaxometry;  Skeletal muscle MRI;  T2;  Water mobility},
  keywords = {article;  biceps brachii muscle;  electromyography;  human;  human experiment;  muscle blood flow;  muscle contraction;  muscle relaxation;  normal human;  oxygen blood level;  passive movement;  priority journal;  proton nuclear magnetic resonance;  skeletal muscle;  triceps brachii muscle;  volunteer;  arm;  body posture;  image processing;  methodology;  muscle contraction;  muscle isometric contraction;  nonparametric test;  nuclear magnetic resonance imaging;  physiology, proton, Humans;  Image Processing, Computer-Assisted;  Isometric Contraction;  Magnetic Resonance Imaging;  Muscle Contraction;  Muscle, Skeletal;  Prone Position;  Protons;  Statistics, Nonparametric;  Upper Extremity},
  chemicals_cas = {proton, 12408-02-5, 12586-59-3; Protons},
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  correspondence_address1 = {Sack, I.; Institute of Radiology, Charité-University Medicine Berlin, Humboldt University Berlin, Schumannstr. 20/21, 10117 Berlin, Germany; email: ingolf.sack@charite.de},
  issn = {10531807},
  coden = {JMRIF},
  doi = {10.1002/jmri.20534},
  pubmed_id = {16514596},
  language = {English},
  abbrev_source_title = {J. Magn. Reson. Imaging},
  document_type = {Article},
  source = {Scopus}
}
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