Study for training using ultrasonic 2-wave method and examination of bone density

• Project/Area Number: 17K01701
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Sports science
• Research Institution: Doshisha University
• Principal Investigator: FUJISAWA YOSHIHIKO 同志社大学, スポーツ健康科学部, 教授 (20209042)
• Co-Investigator(Kenkyū-buntansha): 北條 達也 同志社大学, スポーツ健康科学部, 教授 (40298740) ; 真野 功 同志社大学, 研究開発推進機構, 嘱託研究員 (50581352) ; 井口 順太 京都先端科学大学, 健康医療学部, 准教授 (70727479)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 競技力 / 資質 / 骨組成 / 超音波 / トレーニング / 骨密度 / 競技力向上 / 骨強度

Outline of Final Research Achievements

This study using the ultrasound bone densitometry device examined how hypertrophy caused by training effected on bone density. As far as we know, most of the previous studies regarding the quality of bone focused on how resistance training was related to "bone density “using X-ray CT. In this study, since we use the ultrasound bone densitometry device which can evaluate the "structural elasticity" of bone as well as "bone quality", we will examine the relationship between bone composition and sports by integrating "bone density" and "bone quality". In this study, we focus on the "external qualities" represented by the physical fitness elements of athletes, as well as the "internal qualities" of bone composition, and study the "qualities" related to the competitive power of athletes from a new perspective.

Academic Significance and Societal Importance of the Research Achievements

骨強度は，70%の骨密度と30%の骨質により構成されていることから，骨組成とスポーツ選手の資質を検討する場合は，骨密度とともに骨質にも注目する必要があると考えられる．そのため本研究は，超音波２波法を用いた骨組成測定装置により，X線CT法では不可能な，骨質すなわち「構造的弾性特性」を測定し，スポーツ活動による重力負荷とを関連付ける研究は例数が少ないものと考える．

Research Products

• [Journal Article] In-match physical demands on elite Japanese rugby union players using a global positioning system. (2020)
  • Author(s): Hayato Yamamoto, Masanori Takemura, Junta Iguchi, Misato Tachibana, Junzo Tsujita, Tatsuya Hojo
  • Journal Title: BMJ open sport & exercise medicine Volume: 6(1) e000659 Issue: 1 Pages: e000659-e000659
  • DOI: 10.1136/bmjsem-2019-000659
  • Peer Reviewed / Open Access
• [Journal Article] Growth of cortical bone thickness and trabecular bone density in Japanese children, (2020)
  • Author(s): Ozaki E, Matsukawa M, Mano I, Matsui D, Yoneda Y, Masumura M, Koyama T, Watanabe I, Maekawa M, Tomida S, Iwasa K, Umemura S, Kuriyama N, Uehara R
  • Journal Title: BONNE Volume: - Pages: 115669-115669
  • DOI: 10.1016/j.bone.2020.115669
• [Journal Article] Seasonal changes in anthropometric, physiological, nutritional, and performance factors in collegiate rowers (2018)
  • Author(s): 1)Iguchi J, Kuzuhara K, Katai K, Hojo T, Fujisawa Y, Kimura M, Yanagida Y, Yamada ,Y,
  • Journal Title: Journal of Strength and Conditioning Research Volume: 印刷中 Issue: 11 Pages: 3225-3231
  • DOI: 10.1519/jsc.0000000000002521
  • Peer Reviewed / Open Access
• [Presentation] 「The comparison of physical and performance characteristics of Japanese American collegiate football players by divisional level」 (2019)
  • Author(s): Iguchi J,Hojo T,Fujisawa Y,Kuzuhara K,Yuasa Y
  • Organizer: 24th Annual Congress of the European College of Sports Science, Prague, Czech Republic.
  • Int'l Joint Research
• [Presentation] Physical and Performance Characteristics of Japanese Division Ⅱ Female Collegiate Basketball Players (2018)
  • Author(s): Iguchi J, Akiko S, Hojo T, Fujisawa Y, Kuzuhara K
  • Organizer: The 23rd annual Congress of European College of Sport Science
  • Int'l Joint Research