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Exploring functional significance of phase synchronization between cardiac and locomotor rhythms

Research Project

Project/Area Number 16500390
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

NIIZEKI Kyuichi  Yamagata University, Faculty of Engineering, Professor, 工学部, 教授 (00228123)

Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2005: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2004: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordsphase synchronization / cardiac rhythm / locomotor rhythm / functional significance / nonlinear oscillator / 筋内圧 / 大腿動脈血流 / 動脈閉塞
Research Abstract

It has been demonstrated that cardiac rhythm and locomotor rhythm are often led to oscillate in coincidence, thereby giving rise to synchronization. The synchronization of cardiac and locomotor rhythms has been suggested to enhance the efficiency of arterial delivery to active muscles during rhythmic exercise, but direct evidence showing such a functional role has not been provided. The present study was conducted to test this hypothesis. Rhythmic intramuscular pressure changes during locomotion were simulated using a computer-controlled, dynamic, thigh-cuff occlusion device. Alternating occlusions of bilateral thigh cuffs, administered at the frequency of the mean heart rate, produced significant phase synchronization between the cardiac and occlusion rhythms, provided that the occlusion pressure is comparable to the systolic pressure. During synchronization, heartbeats were most likely to occur in phases that did not include overlap between peak arterial flow velocity in the thigh and elevated cuff pressure.
Next, we compared the coupling phases that occurred during the simulation of intramuscular pressure changes and during walking on a treadmill. During walking experiment, subjects were required to walk while synchronizing their locomotion pace with their mean heart rate. The timing of the intramuscular pressure change was evaluated using the cuff wrapped around right thigh. Almost identical distributions of the phase histogram were found between walking and simulation experiments. The synchronized phases observed in both experiments are approximately consistent. These results suggest that cardiac-locomotor synchronization occurs so that the cardiac cycle is timed to deliver blood through the lower legs when the intramuscular pressure is not maximal.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (12 results)

All 2005 2004

All Journal Article (10 results) Book (2 results)

  • [Journal Article] Heartbeat is coupled with rhythmic increases in intramuscular pressure : Implications for cardiac-locomotor synchronization2005

    • Author(s)
      Niizeki K., Suzuki S., Oshikiri K.
    • Journal Title

      FASEB JOURNAL 19(4)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Intramuscular pressure-induced inhibition of cardiac contraction : implications for cardiac-locomotor synchronization2005

    • Author(s)
      Niizeki K.
    • Journal Title

      Am. J. Physiol. Regulatory Integrative and Comparative Physiology 288(3)

      Pages: 645-650

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Functional significance of coupling between cardiac and locomotor rhythms2005

    • Author(s)
      Suzuki S., Aiba K., Nishidate I., Niizeki K.
    • Journal Title

      Transaction of the Jpn.Soc. for Med.Biol.Eng. 43

      Pages: 565-565

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Heartbeat is coupled with rhythmic increases in intramuscular pressure : Implications for cardiac-locomotor synchronization.2005

    • Author(s)
      Niizeki K., Suzuki S., Oshikiri K.
    • Journal Title

      FASEB JOURNAL 19(4)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Intramuscular pressure-induced inhibition of cardiac contraction : implications for cardiac-locomotor synchronization.2005

    • Author(s)
      Niizeki K.
    • Journal Title

      Am.J.Physiol.Regulatory Integrative and Comparative Physiology 288(3)

      Pages: 645-650

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Functional significance of coupling between cardiac and locomotor rhythms.2005

    • Author(s)
      Suzuki S., Aiba K., Nishidate I., Niizeki K.
    • Journal Title

      Transaction of the Jpn.Soc.for Med.Biol.Eng. 43

      Pages: 565-565

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Intramuscular pressure-induced inhibition of cardiac contraction : implications for cardiac-locomotor synchronization2005

    • Author(s)
      Niiseki K.
    • Journal Title

      Am.J.Physiol. Regulatory Integrative and Comparative Physiology 288(3)

      Pages: 645-650

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Functional significance of coupling between cardiac and locomotor rhythms2005

    • Author(s)
      Suzuki S., Aiba K., Nishidate I., Niizeki K.
    • Journal Title

      Transaction of the Jpn.Soc.for Med.Biol.Eng. 43

      Pages: 565-565

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Intramuscular pressure-induced inhibition of cardiac contraction : implications for cardiac-locomotor synchronization.2005

    • Author(s)
      K.Niizeki
    • Journal Title

      Am.J.Physiol. 288

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Heart abhors contracting during elevated intramuscular pressure : implication for cardiac-locomotor synchronization.2004

    • Author(s)
      K.Niizeki
    • Journal Title

      Proc.43th SICE Int.Ann.Conf.(SICE'04) CDROM論文集

    • NAID

      130005441213

    • Related Report
      2004 Annual Research Report
  • [Book] 「呼吸の事典」第32章 呼吸リズムと運動リズム2005

    • Author(s)
      新関久一
    • Total Pages
      11
    • Publisher
      朝倉書店
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Book] Encyclopedia of Respiration (in Japanese)2005

    • Author(s)
      Niizeki K.
    • Publisher
      Asakura Publishing Co.Ltd.
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary

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Published: 2004-04-01   Modified: 2016-04-21  

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