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Alteration of proton diffusivity associated with passive muscle extension and contraction
Author(s) -
Hatakenaka Masamitsu,
Matsuo Yoshio,
Setoguchi Taro,
Yabuuchi Hidetake,
Okafuji Takashi,
Kamitani Takeshi,
Nishikawa Kei,
Honda Hiroshi
Publication year - 2008
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.21302
Subject(s) - ankle , plantar flexion , gastrocnemius muscle , ankle dorsiflexion , contraction (grammar) , tibialis anterior muscle , medicine , muscle contraction , thermal diffusivity , skeletal muscle , fractional anisotropy , anatomy , diffusion mri , magnetic resonance imaging , physics , radiology , quantum mechanics
Purpose To determine whether passive muscle extension and contraction affect the proton diffusivity of the muscle. Materials and Methods Five male subjects were examined. The fractional anisotropy (FA), and primary (λ 1 ), secondary (λ 2 ), and tertiary eigenvalues (λ 3 ) of the right tibialis anterior and medial gastrocnemius muscles were compared between conditions of passive plantar flexion and passive dorsiflexion of the ankle joint. Results In the tibialis anterior, FA, and λ 1 at dorsiflexion decreased significantly ( P < 0.01 and P < 0.01, respectively) compared to those at plantar flexion, but λ 3 at dorsiflexion increased significantly ( P = 0.02). In the gastrocnemius, FA and λ 1 at dorsiflexion increased significantly ( P < 0.01 and P < 0.01, respectively) compared to those at plantar flexion, but λ 3 at dorsiflexion decreased significantly ( P < 0.01). The λ 2 value showed no significant change in either the tibialis anterior or medial gastrocnemius. Conclusion The results indicate that passive muscle extension and contraction associated with passive joint movement would affect the proton diffusivity of the muscle. This alteration of proton diffusivity is probably associated with microscopic structural changes of the muscle. J. Magn. Reson. Imaging 2008;27:932–937. © 2008 Wiley‐Liss, Inc.