Use of Three-Dimensional Ultrasonography for the Analysis of the Fascicle Length of Human Gastrocnemius Muscle During Contractions

• Kurihara Toshiyuki

  Department of Life Sciences (Sports Sciences), University of Tokyo

• Oda Toshiaki

  Department of Life Sciences (Sports Sciences), University of Tokyo

• Chino Kentaro

  Department of Life Sciences (Sports Sciences), University of Tokyo

• Kanehisa Hiroaki

  Department of Life Sciences (Sports Sciences), University of Tokyo

• Fukunaga Tetsuo

  Faculty of Sport Sciences, Waseda University

• Kawakami Yasuo

  Faculty of Sport Sciences, Waseda University

抄録

The fascicle lengths of the human gastrocnemius muscle during isometric plantar flexions were analyzed using a three-dimensional ultrasound system (3D-US). Prior to measurements in vivo, the accuracy and reproducibility of the 3D-US were examined by taking images of a phantom. The horizontal errors were 0.3-1.0%, and the vertical errors were 1.2-1.6%. In addition, the coefficients of variance for the repeated measurements were 3.3% and 1.7% for horizontal and vertical directions, respectively. Second, both at rest and each of five intensities {20, 40, 60, 80, 100% of maximum voluntary contraction (MVC)}, at a fixed ankle joint angle of 90deg, the 3D-US images of gastrocnemius muscles were obtained and used to determine fascicle length. The fascicle length was also measured using two-dimensional ultrasound system (2D-US), and the values obtained by 2D-US were used to make comparisons with those by 3D-US. From rest to MVC, the fascicle length decreased as a function of relative torque levels from 6.0 (± 0.5) cm to 3.1 (± 0.4) cm with 3D-US, and, in a similar manner, from 5.6 (± 0.5) cm to 3.0 (± 0.4) cm with 2D-US. Thus the present study indicated the accuracy and reproducibility of the 3D-US measurements and its usefulness for determining the fascicle lengths of human muscles in three-dimensional space. The fascicle length measurements determined by 3D-US were, however, significantly longer than those of 2D-US.

収録刊行物

• Ｉｎｔ．　Ｊ．　Ｓｐｏｒｔ　Ｈｅａｌｔｈ　Ｓｃｉ．

  Ｉｎｔ．　Ｊ．　Ｓｐｏｒｔ　Ｈｅａｌｔｈ　Ｓｃｉ． 3 (Special_Issue_2005), 226-234, 2005

  一般社団法人 日本体育・スポーツ・健康学会

キーワード

• ultrasonography
• fascicle length
• contraction-induced changes
• isometric contractions

詳細情報

• CRID: 1390282680263562368
• NII論文ID: 130000069682
• DOI: 10.5432/ijshs.3.226
• ISSN: 18804012
• ISSN: 13481509
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可