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The cause of shoulder disorders of juvenile baseball pitchers by analyzing shoulder girdle motion

Research Project

Project/Area Number 17500445
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Sports science
Research InstitutionChukyo University

Principal Investigator

SHIMIZU Takuya (2006)  Chukyo University, School of Health and Sport Sciences, Professor, 体育学部, 教授 (60273223)

桜井 伸二 (2005)  中京大学, 体育学部, 教授 (20144173)

Co-Investigator(Kenkyū-buntansha) 清水 卓也  中京大学, 体育学部, 教授 (60273223)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Keywordslandmark / magnetic sensor / DLT method / restriction of internal rotation / laxity / baseball shoulder / juvenile / baseball / 体表マーカー / 内旋制限 / 肩甲骨 / 上肢帯 / コッキング / 加速期 / 赤外線3次元動作解析装置
Research Abstract

We measured the position of the anatomical landmarks of the scapular and humerus by use of an optical motion capture system at 25 selected positions (5 elevation planes and 5 elevation angles) of the upper arm and estimated changes of the scapulohumeral angle during the dynamic upperarm elevation by the regression equation, and compared with data obtained by use of an electromagnetic sensor which were set as standard values. The estimated scapular internal rotation and upward rotation values matched well with those measured by electromagnetic sensor when the humeral horizontal adduction angle was above 30°. A systematic error was observed between the estimated values and the data obtained from the electromagnetic sensor when the humeral adduction angle was less than 30°. The scapular tilt could not be estimated with accuracy. The present model can reasonably predict scapular upward rotation and internal rotation angles.
We had medical check on shoulders of forty juvenile baseball players (av. 12.3 years). External rotation of the first position of the dominant side was significantly greater than that of the non-dominant side. Nine players who had positive sulcus signs on either dominant or non-dominant side had significantly less internal rotation of the third position than the other players. Whereas the eighteen players who had positive posterior laxity on either dominant or non-dominant side didn't have significantly less internal rotation of the third position than the other players. Positive sulcus sign suggests inferior laxity. This means inferior laxity has different role on developing posterior tightness of the throwing shoulder from posterior laxity.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (6 results)

All 2007 2006

All Journal Article (6 results)

  • [Journal Article] 愛知県内少年野球チームの肩関節および肘関節のメディカルチェック2007

    • Author(s)
      清水卓也, 桜井伸二ら
    • Journal Title

      中京大学体育学論叢 48巻1・2合併号

      Pages: 1-6

    • NAID

      110006607245

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Medical Assessment on Shoulder and Elbow Joints of Juvenile Players of Baseball Club in Aichi Prefecture2007

    • Author(s)
      Shimizu T. et al.
    • Journal Title

      Research Journal of Physical Education Chukyo University 48

      Pages: 1-6

    • NAID

      110006607245

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Quantitative Analysis of Human Scapular Motion by Skin Based Markers -Static Analysis-2007

    • Author(s)
      Konda S. et al.
    • Journal Title

      Proceeding of the 19^<th> Annual Meeting of Japanese Society of Biomechanics 100

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 愛知県内少年野球チームの型関節および肘関節のメディカルチェック2007

    • Author(s)
      清水卓也, 桜井伸二ら
    • Journal Title

      中京大学体育学論叢 1(in print)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 体表マーカーによる肩甲骨の動きの定量化-静的状態での計測-2006

    • Author(s)
      近田彰治, 清水卓也ら
    • Journal Title

      第19回日本バイオメカニクス学会大会論集

      Pages: 100-100

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 体表マーカーによる肩胛骨の動きの定量化-静的状態での計測-2006

    • Author(s)
      今田章治, 清水卓也ら
    • Journal Title

      第19回日本バイオメカニクス学会大会論集

      Pages: 100-100

    • Related Report
      2006 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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