Changes in morphological and mechanical properties of muscle-tendon unit with aging

• Project/Area Number: 20509007
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Sports science
• Research Institution: Waseda University
• Principal Investigator: KINUGASA Ryuta Waseda University, スポーツ科学学術院, 助教 (10409378)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥240,000); Fiscal Year 2010: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2009: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2008: ¥2,600,000 (Direct Cost: ¥2,600,000)
• Keywords: 歪み / 高齢者 / 腓腹筋 / 腱膜 / ギア比 / 筋束 / 足関節底屈 / 筋・腱組織のひずみ / 筋の形状 / 腱組織の形状 / 筋収縮 / ヒラメ筋

Research Abstract

I hypothesized that during an isometric contraction, elderly people have greater longitudinal strain than young people. Aponeurosis longitudinal strain was greater in young people than in elderly people. The magnitude of fascicle shortening was significantly lower in elderly people than in young people. The "amplification" of muscle fascicle length changes into aponeurosis displacement has been termed the "gear ratio". The lower than unity value of the ratio implies that the aponeurosis displacement is lower than the fascicle length change. These results suggest that movement of the calcaneus would be constrained by due to lower aponeurosis longitudinal strain without amplification of the muscle fascicle length change.

Research Products

• [Journal Article] Reduction in Tendon Elasticity from Unloading is unrelated to its Hypertrophy. (2010)
  • Author(s): Ryuta Kinugasa, John A.Hodgson, V.Reggie Edgerton, David D.Shin, Shantanu Sinha
  • Journal Title: J Appl Physiol 109 Pages: 870-877
  • Peer Reviewed
• [Journal Article] Reduction in tendon elasticity from unloading is unrelated to its hypertrophy (2010)
  • Author(s): Kinugasa, et al
  • Journal Title: J Appl Physiol Volume: 109 Pages: 870-877
  • Peer Reviewed
• [Journal Article] Phase contrast MRI reveals the mechanical behavior of the superficial and deep aponeuroses in human medial gastrocnemius during isometric contraction (2008)
  • Author(s): Ryuta Kinugasa, Dongsuk Shin, Junichiro Yamauchi, Chandan Mishra, John A.Hodgson, V.Reggie Edgerton, Shantanu Sinha
  • Journal Title: J Appl Physiol 105 Pages: 1312-1320
  • Peer Reviewed
• [Presentation] Reduced Stiffness is Uncorrelated to Tendon Hypertrophy Resulting From Unloading of LowerLeg Limb. (2010)
  • Author(s): Ryuta Kinugasa, John A. Hodgson, V.Reggie Edgerton, David D.Shin, Shantanu Sinha
  • Organizer: 15th annual Congress of the European College of Sport Science
  • Place of Presentation: Antalya, Turkey
• [Presentation] Reduced Stiffness is Uncorrelated to Tendon Hypertrophy Resulting From Unloading of LowerLeg Limb (2010)
  • Author(s): Kinugasa, et al.
  • Organizer: 15th annual Congress of the European College of Sport Science
  • Place of Presentation: Antalya, Turkey
• [Presentation] Velocity encoded phase contrast MRI reveals in vivo tissue dynamics of the human medial gastrocnemius during isometric contraction. (2008)
  • Author(s): Ryuta Kinugasa, Dongsuk Shin, John A.Hodgson, V.Reggie Edgerton, Shantanu Sinha
  • Organizer: International Society for Magnetic Resonance in Medicine 16th Scientific Meeting and Exhibition
  • Place of Presentation: Toronto, Canada
• [Presentation] Superficial and deep aponeuroses movements in the human medial gastrocnemius during isometric plantarflexion contraction (2008)
  • Author(s): Ryuta Kinugasa, Dongsuk Shin, John A.Hodgson, V.Reggie Edgerton, Shantanu Sinha
  • Organizer: Experimental Biology 2008
  • Place of Presentation: San Diego, CA, USA
• [Book] 運動生理学のニューエビデンス(宮村実晴編集)(神経・筋活動分布) (2010)
  • Author(s): 衣笠竜太
  • Publisher: 真興交易(株)医書出版部,東京
• [Book] 運動生理学のニューエビデンス (2010)
  • Author(s): 衣笠竜太
  • Total Pages: 464
  • Publisher: 神経・筋活動分布
• [Remarks] 受賞 American College of Sport Medicine, Biomechanics Interest Group : Vendor's Innovation in Research Award, 2009.
• [Remarks] ホームページ
  • URL: http://www.aoni.waseda.jp/rkinugasa/japn.htm
• [Remarks]
  • URL: http://www.aoni.waseda.jp/rkinugasa/japn.htm