Non-invasive analysis of recruitment properties of human motor units using electrical muscle stimulation

• Project/Area Number: 21700651
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Sports science
• Research Institution: The University of Tokyo
• Principal Investigator: SASAKI Kazushige 東京大学, 大学院・総合文化研究科, 助教 (00451849)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2009: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 生理学 / 骨格筋 / 単収縮 / サイズの原理 / 筋電図

Research Abstract

The purpose of this study was to test whether recruitment properties of human motor units can be non-invasively determined by using electrical muscle stimulation. Specifically, a single electrical pulse was applied to the resting muscle before and after a 6-s voluntary force production and then the "potentiation" of electrically evoked contractile response due to the voluntary force production was determined. The results suggest that the magnitude of potentiation represents the recruitment properties of fast-twitch muscle fibers during voluntary muscle contraction predicted from the "size principle".

Research Products

• [Journal Article] Activation of fast-twitch fibers assessed with twitch potentiation (2012)
  • Author(s): Sasaki K, Tomioka Y, Ishii N
  • Journal Title: Muscle and Nerve Volume: (掲載確定)(印刷中) Issue: 2 Pages: 218-227
  • DOI: 10.1002/mus.23290
  • Peer Reviewed
• [Journal Article] Acceleration and force reveal different mechanisms of electromechanical delay (2011)
  • Author(s): Sasaki, K., Sasaki, T., Ishii, N.
  • Journal Title: Medicine and Science in Sports and Exercise Volume: 43 Issue: 7 Pages: 1200-1206
  • DOI: 10.1249/mss.0b013e318209312c
  • Peer Reviewed
• [Journal Article] Unloaded shortening velocity of voluntarily and electrically activated human dorsiflexor muscles in vivo (2010)
  • Author(s): Sasaki K, Ishii N.
  • Journal Title: PLoS One Volume: 5
  • Peer Reviewed
• [Journal Article] Activation of fast-twitch fibers assessed with twitch potentiation.
  • Author(s): Sasaki K, Tomioka Y, and Ishii N.
  • Journal Title: Muscle Nerve Volume: (印刷中掲載確定)
  • Peer Reviewed
• [Journal Article] Endocrine responses to upper- and lower-limb resistance exercises with blood flow restriction
  • Author(s): Madarame H, Sasaki K, Ishii N.
  • Journal Title: Acta Physiologica Hungarica (印刷中)
  • Peer Reviewed
• [Presentation] 速筋線維動員特性の性差と年齢差:筋電気刺激による非侵襲的解析 (2010)
  • Author(s): 佐々木一茂、富岡由紀絵、石井直方
  • Organizer: 第65回日本体力医学会大会
  • Place of Presentation: 千葉
  • Year and Date: 2010-09-17
• [Presentation] 速筋線維動員特性の性差と年齢差:筋電気刺激による非侵襲的解析 (2010)
  • Author(s): 佐々木一茂、富岡由紀絵、石井直方
  • Organizer: 第65回日本体力医学会大会
  • Place of Presentation: 千葉商科大学
  • Year and Date: 2010-09-17
• [Presentation] 主働筋活動を意識した外的無負荷筋力トレーニング法の急性効果 (2009)
  • Author(s): 林芳、佐々木一茂、石井直方
  • Organizer: 第22回日本トレーニング科学会大会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2009-12-06
• [Presentation] 間欠的人工低酸素環境曝露を伴う筋力トレーニングによる筋力の変化 (2009)
  • Author(s): 禰屋光男、佐々木一茂、班目春彦、蒔苗裕平
  • Organizer: 第64回日本体力医学会大会
  • Place of Presentation: 朱鷺メッセ
  • Year and Date: 2009-09-20
• [Presentation] 単収縮の強縮後増強に着目した速筋線維動員特性の解析 (2009)
  • Author(s): 富岡由紀絵、佐々木一茂、石井直方
  • Organizer: 第64回日本体力医学会大会
  • Place of Presentation: 新潟
  • Year and Date: 2009-09-19
• [Presentation] 単収縮の強縮後増強に着目した速筋線維動員特性の解析 (2009)
  • Author(s): 富岡由紀絵、佐々木一茂、石井直方
  • Organizer: 第64回日本体力医学会大会
  • Place of Presentation: 朱鷺メッセ
  • Year and Date: 2009-09-19
• [Presentation] スラックテスト法を応用したヒト肘屈筋無負荷短縮速度の評価:等張力性後負荷法との比較 (2009)
  • Author(s): 佐々木卓、佐々木一茂、石井直方
  • Organizer: 第17回日本運動生理学会大会
  • Place of Presentation: 東京慈恵会医科大学
  • Year and Date: 2009-07-26
• [Presentation] スラックテスト法を応用したヒト肘屈筋無負荷短縮速度の評価:静的測定法の開発 (2009)
  • Author(s): 佐々木一茂、佐々木卓、石井直方
  • Organizer: 第17回日本運動生理学会大会
  • Place of Presentation: 東京慈恵会医科大学
  • Year and Date: 2009-07-25