• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Uncovering mechanisms of human circulatory control during exercise in the heat and building a basis for its applications

Research Project

Project/Area Number 21K17582
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 59020:Sports sciences-related
Research InstitutionAkita University

Principal Investigator

Watanabe Kazuhito  秋田大学, 教育文化学部, 准教授 (70733145)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords暑熱ストレス / 心機能 / 循環反応 / 呼吸代謝応答 / 血液の運動エネルギー / 体温 / 運動 / 暑熱負荷
Outline of Research at the Start

暑熱環境下での長時間運動など、体温上昇や体水分損失(脱水)による複合的なストレス下では循環器系への負担が増大する。その典型として心臓から拍出される血液量(心拍出量)の減少が起こり、これは熱中症発症の誘因となるが、心臓の収縮・拡張機能は体温上昇と脱水によってむしろ高まる傾向がみられる。本研究では、体温上昇と脱水により運動時の心機能が亢進する主要因を明らかにし、暑熱下運動時の循環動態の制御メカニズムに関する理解を深め、安全かつ効果的な新しい運動法開発のための基盤構築を目指す。

Outline of Final Research Achievements

This study comprehensively investigated human circulatory responses and cardiac function and its relation to the other physiological responses during hyperthermia. Findings of this study suggest that local hyperthermia does not have profound effects on left ventricular function, whereas core hyperthermia enhances left ventricular systolic and diastolic functions. Alterations in pulmonary ventilation, systemic aerobic metabolism and blood volume may be involved in the enhanced LV functions during hyperthermia, but these responses are not obligatory for increasing cardiac output during hyperthermia. Furthermore, observations based on hydrodynamic approach suggest that local hyperthermia-induced selective augmentations in the velocity and kinetic energy of flowing blood appear to play an important role in the elevated cardiac output during hyperthermia.

Academic Significance and Societal Importance of the Research Achievements

本研究では、運動や暑熱に関わる種々の生理応答に関して、高体温時の循環応答や心機能を中心とした統合的な検討を行い、呼吸、代謝、体液等の変化が心機能変化の誘因となり得ること、また、心拍出量応答は必ずしもそれらの要因と関連せず、末梢血の流速や運動エネルギーに強く影響を受ける可能性があることが示唆された。本研究の成果はヒトの高体温時の循環動態制御メカニズムの解明に寄与し、今後のさらなる知見の集積により運動や暑熱負荷の効果や安全性の向上に資する方法開発へ繋がると考えられる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (13 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (5 results) Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (2 results) (of which Int'l Joint Research: 1 results) Book (1 results) Remarks (1 results)

  • [Int'l Joint Research] ブルネル大学(英国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] ブルネル大学(英国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] ハノーファー大学(ドイツ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] ブルネル大学(英国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] ハノーファー大学(ドイツ)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Heat‐related changes in the velocity and kinetic energy of flowing blood influence the human heart's output during hyperthermia2024

    • Author(s)
      Kazuhito Watanabe, Nuno Koch Esteves, Oliver R. Gibson, Koichi Akiyama, Sumie Watanabe, Jose Gonzalez-Alonso
    • Journal Title

      The Journal of Physiology

      Volume: 602 Issue: 10 Pages: 2227-2251

    • DOI

      10.1113/jp285760

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Muscle metaboreflex activation during hypercapnia modifies nonlinear heart rhythm dynamics, increasing the complexity of the sinus node autonomic regulation in humans2023

    • Author(s)
      Stephane Delliaux, Masashi Ichinose, Kazuhito Watanabe, Naoto Fujii, Takeshi Nishiyasu
    • Journal Title

      Pflugers Archiv - European Journal of Physiology

      Volume: 475 Issue: 4 Pages: 527-539

    • DOI

      10.1007/s00424-022-02780-x

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 運動時循環反応の個人差2022

    • Author(s)
      渡邊 和仁, 一之瀬 真志, 藤井 直人, 西保 岳
    • Journal Title

      体育の科学

      Volume: 72 Pages: 176-182

    • Related Report
      2021 Research-status Report
  • [Journal Article] Carbohydrate hastens hypervolemia achieved through ingestion of aqueous sodium solution in resting euhydrated humans2021

    • Author(s)
      Naoto Fujii, Akira Sugihara, Kazuhito Watanabe, Takehiro Niwa, Akira Katagiri, Shodai Moriyama, Izumi Miyanagi, Junpei Kojima, Takeshi Nishiyasu
    • Journal Title

      European Journal of Applied Physiology

      Volume: 121 Issue: 12 Pages: 3527-3537

    • DOI

      10.1007/s00421-021-04788-0

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Vascular and cardiac interactions during leg and whole-body hyperthermia: Insight into the peripheral and central mechanisms controlling the human circulation2022

    • Author(s)
      Kazuhito Watanabe, Nuno Koch Esteves, Eric J. Stohr, Oliver Gibson, Koichi Akiyama, Sumie Watanabe, Jose Gonzalez-Alonso
    • Organizer
      27th Annual Congress of the European College of Sport Science
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 温熱負荷に対する心拍出量及び末梢血流量の応答と体温変化との関係2022

    • Author(s)
      渡邊 和仁,Nuno Koch Esteves, Eric J. Stohr, Oliver Gibson, 秋山 浩一, 渡邊 寿美江, Jose Gonzalez-Alonso
    • Organizer
      第77回日本体力医学会大会
    • Related Report
      2022 Research-status Report
  • [Book] 『温度ストレスによる生体応答ダイナミクス』 第6章第2節「暑熱下運動時における循環動態制御メカニズム」2023

    • Author(s)
      渡邊 和仁
    • Total Pages
      9
    • Publisher
      エヌ・ティー・エス
    • ISBN
      9784860438302
    • Related Report
      2023 Annual Research Report
  • [Remarks] Akita University Lab Interview vol.60

    • URL

      https://www.akita-u.ac.jp/honbu/lab/vol_60.html

    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-04-28   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi