Alterations in intramuscular water movement associated with mechanical changes in human skeletal muscle fibers: An evaluation using magnetic resonance diffusion-weighted imaging and B-mode ultrasonography

Osamu Yanagisawa, Toshiyuki Kurihara, Toru Fukubayashi

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Background: Intramuscular water movement is expected to be affected by the mechanical changes of the muscle fibers. However, the effect of changes in fiber length (FL) and pennation angle (PA) on the water movement has not been sufficiently investigated in human skeletal muscles. Purpose: To determine the relationship between intramuscular water movement and the mechanical changes in human muscle fibers. Material and Methods: Axial magnetic resonance diffusion-weighted images of the right leg (eight men) were taken using a 1.5-Tesla device with the ankle joint maximally dorsiflexed and maximally plantar flexed. The apparent diffusion coefficient (ADC) values of both the dorsiflexors (the superficial and deep parts of the tibialis anterior) and the plantar flexors (medial gastrocnemius and soleus) were calculated along three orthogonal axes (S-I: superior-to-inferior, A-P: anterior-to-posterior, and R-L: right-to-left). FL and PA of both muscle groups were also calculated from longitudinal B-mode ultrasound images with the ankle joint maximally dorsiflexed and plantar flexed. Results: There was a significant increase in the ADC in superficial (P < 0.05) and deep (P < 0.05) parts of the dorsiflexors in the S-I direction when the ankle was plantar flexed and in the A-P and R-L directions when the ankle was dorsiflexed (P < 0.05). The plantar flexors showed significantly elevated ADC in the S-I direction when the ankle was dorsiflexed (P < 0.05), and in the A-P and R-L directions when the ankle was plantar flexed (P < 0.05). The dorsiflexors also showed significantly increased PA and decreased FL values when the ankle was dorsiflexed (P < 0.05). The plantar flexors displayed similar morphological changes when the ankle was plantar flexed (P< 0.05). Conclusion: Water diffusion is affected by structural changes in the long axis of the muscle fibers, namely the changes in PA and FL.

    Original languageEnglish
    Pages (from-to)1003-1008
    Number of pages6
    JournalActa Radiologica
    Volume52
    Issue number9
    DOIs
    Publication statusPublished - 2011 Nov

    Fingerprint

    Water Movements
    Diffusion Magnetic Resonance Imaging
    Skeletal Muscle Fibers
    Ankle
    Ultrasonography
    Muscles
    Ankle Joint
    Leg
    Skeletal Muscle
    Magnetic Resonance Spectroscopy
    mephenoxalone
    Equipment and Supplies
    Direction compound
    Water

    Keywords

    • Fiber length
    • Pennation angle
    • Skeletal muscle
    • Water diffusion

    ASJC Scopus subject areas

    • Radiology Nuclear Medicine and imaging
    • Radiological and Ultrasound Technology
    • Medicine(all)

    Cite this

    Alterations in intramuscular water movement associated with mechanical changes in human skeletal muscle fibers : An evaluation using magnetic resonance diffusion-weighted imaging and B-mode ultrasonography. / Yanagisawa, Osamu; Kurihara, Toshiyuki; Fukubayashi, Toru.

    In: Acta Radiologica, Vol. 52, No. 9, 11.2011, p. 1003-1008.

    Research output: Contribution to journalArticle

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    abstract = "Background: Intramuscular water movement is expected to be affected by the mechanical changes of the muscle fibers. However, the effect of changes in fiber length (FL) and pennation angle (PA) on the water movement has not been sufficiently investigated in human skeletal muscles. Purpose: To determine the relationship between intramuscular water movement and the mechanical changes in human muscle fibers. Material and Methods: Axial magnetic resonance diffusion-weighted images of the right leg (eight men) were taken using a 1.5-Tesla device with the ankle joint maximally dorsiflexed and maximally plantar flexed. The apparent diffusion coefficient (ADC) values of both the dorsiflexors (the superficial and deep parts of the tibialis anterior) and the plantar flexors (medial gastrocnemius and soleus) were calculated along three orthogonal axes (S-I: superior-to-inferior, A-P: anterior-to-posterior, and R-L: right-to-left). FL and PA of both muscle groups were also calculated from longitudinal B-mode ultrasound images with the ankle joint maximally dorsiflexed and plantar flexed. Results: There was a significant increase in the ADC in superficial (P < 0.05) and deep (P < 0.05) parts of the dorsiflexors in the S-I direction when the ankle was plantar flexed and in the A-P and R-L directions when the ankle was dorsiflexed (P < 0.05). The plantar flexors showed significantly elevated ADC in the S-I direction when the ankle was dorsiflexed (P < 0.05), and in the A-P and R-L directions when the ankle was plantar flexed (P < 0.05). The dorsiflexors also showed significantly increased PA and decreased FL values when the ankle was dorsiflexed (P < 0.05). The plantar flexors displayed similar morphological changes when the ankle was plantar flexed (P< 0.05). Conclusion: Water diffusion is affected by structural changes in the long axis of the muscle fibers, namely the changes in PA and FL.",
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    T2 - An evaluation using magnetic resonance diffusion-weighted imaging and B-mode ultrasonography

    AU - Yanagisawa, Osamu

    AU - Kurihara, Toshiyuki

    AU - Fukubayashi, Toru

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    N2 - Background: Intramuscular water movement is expected to be affected by the mechanical changes of the muscle fibers. However, the effect of changes in fiber length (FL) and pennation angle (PA) on the water movement has not been sufficiently investigated in human skeletal muscles. Purpose: To determine the relationship between intramuscular water movement and the mechanical changes in human muscle fibers. Material and Methods: Axial magnetic resonance diffusion-weighted images of the right leg (eight men) were taken using a 1.5-Tesla device with the ankle joint maximally dorsiflexed and maximally plantar flexed. The apparent diffusion coefficient (ADC) values of both the dorsiflexors (the superficial and deep parts of the tibialis anterior) and the plantar flexors (medial gastrocnemius and soleus) were calculated along three orthogonal axes (S-I: superior-to-inferior, A-P: anterior-to-posterior, and R-L: right-to-left). FL and PA of both muscle groups were also calculated from longitudinal B-mode ultrasound images with the ankle joint maximally dorsiflexed and plantar flexed. Results: There was a significant increase in the ADC in superficial (P < 0.05) and deep (P < 0.05) parts of the dorsiflexors in the S-I direction when the ankle was plantar flexed and in the A-P and R-L directions when the ankle was dorsiflexed (P < 0.05). The plantar flexors showed significantly elevated ADC in the S-I direction when the ankle was dorsiflexed (P < 0.05), and in the A-P and R-L directions when the ankle was plantar flexed (P < 0.05). The dorsiflexors also showed significantly increased PA and decreased FL values when the ankle was dorsiflexed (P < 0.05). The plantar flexors displayed similar morphological changes when the ankle was plantar flexed (P< 0.05). Conclusion: Water diffusion is affected by structural changes in the long axis of the muscle fibers, namely the changes in PA and FL.

    AB - Background: Intramuscular water movement is expected to be affected by the mechanical changes of the muscle fibers. However, the effect of changes in fiber length (FL) and pennation angle (PA) on the water movement has not been sufficiently investigated in human skeletal muscles. Purpose: To determine the relationship between intramuscular water movement and the mechanical changes in human muscle fibers. Material and Methods: Axial magnetic resonance diffusion-weighted images of the right leg (eight men) were taken using a 1.5-Tesla device with the ankle joint maximally dorsiflexed and maximally plantar flexed. The apparent diffusion coefficient (ADC) values of both the dorsiflexors (the superficial and deep parts of the tibialis anterior) and the plantar flexors (medial gastrocnemius and soleus) were calculated along three orthogonal axes (S-I: superior-to-inferior, A-P: anterior-to-posterior, and R-L: right-to-left). FL and PA of both muscle groups were also calculated from longitudinal B-mode ultrasound images with the ankle joint maximally dorsiflexed and plantar flexed. Results: There was a significant increase in the ADC in superficial (P < 0.05) and deep (P < 0.05) parts of the dorsiflexors in the S-I direction when the ankle was plantar flexed and in the A-P and R-L directions when the ankle was dorsiflexed (P < 0.05). The plantar flexors showed significantly elevated ADC in the S-I direction when the ankle was dorsiflexed (P < 0.05), and in the A-P and R-L directions when the ankle was plantar flexed (P < 0.05). The dorsiflexors also showed significantly increased PA and decreased FL values when the ankle was dorsiflexed (P < 0.05). The plantar flexors displayed similar morphological changes when the ankle was plantar flexed (P< 0.05). Conclusion: Water diffusion is affected by structural changes in the long axis of the muscle fibers, namely the changes in PA and FL.

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    KW - Pennation angle

    KW - Skeletal muscle

    KW - Water diffusion

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