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Development of a new index for quantifying muscle elongation using ultrasonography

Research Project

Project/Area Number 22K21223
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0909:Sports sciences, physical education, health sciences, and related fields
Research InstitutionKansai Medical University

Principal Investigator

Nakao Sayaka  関西医科大学, リハビリテーション学部, 助教 (30967253)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords超音波診断装置 / ストレッチング / 筋輝度
Outline of Research at the Start

各筋の効果的なストレッチング方法の開発や効果検証のため、個別の筋の伸張量を非侵襲的に定量化できる指標が必要である。筋の伸張量の評価方法として、超音波診断装置せん断波エラストグラフィー機能で計測される弾性率が用いられるが、装置が高価であるため、汎用性が低い。そこで本研究では、比較的安価な超音波診断装置でも算出可能な輝度に着目し、筋伸張に伴い筋の輝度が増加するかを若年者や高齢者において検証する。

Outline of Final Research Achievements

We investigated whether echo intensity of the gastrocnemius muscle would change with muscle elongation by passive ankle angle change. To evaluate echo intensity, B-mode images were scanned longitudinally using ultrasonography. The echo intensity was determined as the average grayscale values of the region of interest (RoI). Grayscale analysis was performed using two RoIs: one that included as much of the muscle as possible, and a rectangular one with size and depth identical for all images captured from all participants. The results indicated that echo intensity increased with muscle elongation via passive ankle dorsiflexion. The echo intensity of the longitudinal images, calculated using the RoI that included as much of the muscle as possible, may be useful for quantifying muscle elongation.

Academic Significance and Societal Importance of the Research Achievements

各筋の効果的なストレッチング方法の開発や効果検証のため、個別の筋の伸張量を非侵襲的に定量化できる指標が必要である。本研究の結果、筋伸張に伴い腓腹筋の輝度が増加することが、若年男性だけでなく、元々筋内脂肪が多く輝度が高いとされる女性においても明らかとなった。本研究の成果は、一般的な超音波診断装置でも算出可能な輝度を新たな筋の伸張量の指標として利用できる可能性を示すものであり、臨床現場での応用につながる可能性が考えられる。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (1 results)

All 2023

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results)

  • [Journal Article] Changes in echo intensity of the gastrocnemius muscle with passive ankle dorsiflexion: can echo intensity be used to assess muscle elongation?2023

    • Author(s)
      Nakao Sayaka、Ikezoe Tome、Yagi Masahide、Umehara Jun、Nojiri Shusuke、Ichihashi Noriaki
    • Journal Title

      Frontiers in Physiology

      Volume: 14 Pages: 1197503-1197503

    • DOI

      10.3389/fphys.2023.1197503

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access

URL: 

Published: 2022-09-01   Modified: 2025-01-30  

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