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Energy metabolism in human masseter muscle observed by mfMRI and 31P-MRS

Research Project

Project/Area Number 23593032
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Orthodontic/Pediatric dentistry
Research InstitutionKyushu University

Principal Investigator

KITAHARA TORU  九州大学, 歯学研究科(研究院), 講師 (00274473)

Co-Investigator(Kenkyū-buntansha) 高橋 一郎  九州大学, 歯学研究科(研究院), 教授 (70241643)
湯浅 賢治  福岡歯科大学, 歯学部, 教授 (40136510)
飯久保 正弘  東北大学, 歯学研究科(研究院), 講師 (80302157)
Project Period (FY) 2011 – 2013
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords咀嚼筋 / 疲労 / 筋機能MRI / 31P-MRS / 咀嚼筋疲労 / MRS / T2値
Research Abstract

1. T2 mapping of the individual masseter muscles showed that 30% MVC produces significant increases in the values. The T2 relaxation time decreased rapidly after the contraction. 2. Using 31P-MRS, it was observed that muscle activation produced significant decreases in the signal intensity of phosphocreatine (PCr), leading to recovery after releasing the 30% MVC, while the inorganic phosphate level (Pi) showed moderate increases and returned to its former condition.
The current state of investigation indicates that the mechanism responsible for the increased T2 results from osmotically-driven shifts in the muscle water that increase the volume of the intracellular space, and from intracellular acidification. Both mfMRI and MRS, a quantitative noninvasive biochemical sampling technique, represent viable alternatives for metabolic studies of the masseter muscle.
These findings suggested the effectiveness of both mfMRI and 31P-MRS as promising tools to study masseter muscle fatigue.

Report

(4 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Research-status Report
  • 2011 Research-status Report
  • Research Products

    (2 results)

All 2013 2012

All Journal Article (2 results)

  • [Journal Article] 咬筋における筋疲労と浮腫性変化の関連に関する研究2013

    • Author(s)
      佐々城真、飯久保正弘、下里舞、笹野高嗣
    • Journal Title

      日本口腔診断学会総会プログラム・抄録集

      Volume: 26 Pages: 79-79

    • Related Report
      2013 Final Research Report
  • [Journal Article] フイルムレスペーパーレスのセファロメトリックプレディクション2012

    • Author(s)
      北原亨
    • Journal Title

      顎変誌

      Volume: 22(4) Pages: 287-290

    • Related Report
      2013 Final Research Report

URL: 

Published: 2011-08-05   Modified: 2019-07-29  

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