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Changes in circulatory dynamics of upper extremity and saccadic reaction time during neck flexion

Research Project

Project/Area Number 14580050
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 体育学
Research InstitutionOsaka City University

Principal Investigator

WATANABE Hitoshi  Osaka City University, Institute for Health and Sport Sciences, Associate Professor, 体育学研究室, 助教授 (50167160)

Co-Investigator(Kenkyū-buntansha) FUJIWARA Katsuo  Kanazawa University, Department of Human Movement and Health, Graduate School of Medical Science, Professor, 大学院・医学系研究科, 教授 (60190089)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2002: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsNeck flexion0 / Saccadic reaction time / Near-infrared spectroscopy / Muscle oxygenation / Vasodilatation / Muscle sympathetic nerve activity / Circulatory dynamics / Brain activation / 脳の賦活 / 衝動性眼球運動反応時間
Research Abstract

The present study investigated changes in circulatory dynamics of upper extremity muscles during a task involving maintaining neck flexion and during the neck flexion task accompanied with an eye movement reaction task. Neck flexion angles were randomly set at 0°, 10° and 20°. Muscle oxygenation in the biceps brachii and triceps brachii, skin blood flow over the muscles, electrocardiograms, blood pressure and cardiac output were measured during both tasks. Furthermore, muscle sympathetic nerve activity (MSNA) was recorded from peroneal nerve during the neck flexion. During the neck flexion task, oxygenation in muscles increased significantly with angle of neck flexion. Oxygenation in muscles tended to be larger in the neck flexion task with the eye movement reaction task than in the neck flexion task alone. A significant difference between tasks was found at 20° flexion. Furthermore, skin blood flow over the biceps brachii tended to be smaller under the combined task than under the neck flexion task alone. A significant difference between tasks was found at 20° flexion. No significant task effects were found in electrocardiograms, blood pressure or cardiac output. Blood flow within upper extremity muscles was clearly increased while maintaining neck flexion. Blood flow increased more when the neck-flexion task accompanied the eye movement reaction task. MSNA was tendency to decrease during neck flexion. This suggests that brain activation associated with maintaining neck flexion influences the vasomotor center in the medulla oblongata controlling circulatory responses, leading to vasodilatation in muscles. Furthermore, additional brain activation appears to offer synergistic effects during the combined neck flexion and eye movement reaction tasks, and reduction of skin blood flow by skin vasoconstriction might be related to increased blood flow in addition to vasodilatation in muscles.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (2 results)

All 2005

All Journal Article (2 results)

  • [Journal Article] 上肢筋循環動態の頚部前屈姿勢保持および眼球運動反応課題による変化2005

    • Author(s)
      渡辺一志, 藤原勝夫, 国田賢治
    • Journal Title

      Health and Behavior Sciences 3(2)

      Pages: 41-48

    • NAID

      130007879435

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Changes in circulatory dynamics of upper extremity muscles during a task involving maintaining neck flexion and during the neck flexion task accompanied with an eye movement reaction task2005

    • Author(s)
      Hitoshi Watanabe, Katsuo Fujiwara, Kenji Kunita
    • Journal Title

      Health and Behavior Sciences 3(2)

      Pages: 41-48

    • NAID

      130007879435

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary

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Published: 2002-04-01   Modified: 2016-04-21  

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