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

The unconscious mental inhibiting process of human maximal voluntary contraction

Research Project

Project/Area Number 21K11532
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 59030:Physical education, and physical and health education-related
Research InstitutionWaseda University

Principal Investigator

Takarada Yudai  早稲田大学, スポーツ科学学術院, 教授 (70367093)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywordsgoal-priming / unconscious motivation / motor system activity / noradrenergic activity / TMS / pupillometry / maximal effort / shout / motor system state / Silent period / Motor system / M1 / silent period / pupillary size / human strength / maximal volition / unconscious / maximal strength / inhibiting process / volition / Unconscious inhibition / maximal volitional force
Outline of Research at the Start

Ikai & Steinhaus(1961)は、「最大随意等尺性筋力(MVC)発揮には抑制機構が作用する」との仮説を提唱した。最近、閾下の視覚刺激による無自覚的動機づけが、MVC発揮前の皮質脊髄路の活性化をともなったMVC増大を引き起こすことが報告されている。これらは運動システムの潜在的な活動特性を暗示しているが、その神経メカニズムは不明である。この神経メカニズム解明を念頭に、上述の仮説の検証を運動システムの活動との関連で試みる。と同時に、被検者のMVCに対する潜在記憶に焦点をあて、MVCの無意識的推論の痕跡を古典的条件づけのパラダイムを用いた無自覚的動機づけによりあぶりだす。

Outline of Final Research Achievements

When combined with the term‘maximal'in the consciously visible form, the effect of this subliminal motor-goal priming in inducing pupil dilation and stronger action preparation/execution was abolished without conscious awareness. This is the first objective evidence of motor inhibitory effect-predicting patterns of pupil-linked noradrenergic activity as a signature of a type of mental inhibition underlying the MVC behavioural goal. Meanwhile, shouting significantly increased handgrip maximal voluntary force and reduced the silent period, indicating that shouting increased handgrip voluntary force during sustained maximal exertion effort through the reduced silent period. This is the first objective evidence that the muscular force of shouting during maximal force exertion is associated with the potentiation of motor system activity produced by the additional drive of shouting operating on the motor system (i.e., shouting-induced excitatory input to the primary motor cortex).

Academic Significance and Societal Importance of the Research Achievements

シャウトが最大随意筋力(MVC)を増加させる原因を調べてみると、シャウト自体の運動指令が一次運動野(M1)皮質内抑制を低減させることが分かった。つまり、シャウトによる力増強効果はシャウトによる心理的抑制の除去あるいは軽減(Ikai & Steinhaus,1961)というよりはむしろ、シャウトに関連した運動指令のM1への追加的入力であることが初めて客観的に示された。このようなMVC変動のメカニズム解明は、アスリートのみならず、筋機能改善を目指した中高齢者やリハビリテーション患者の健康・運動性能の適切な評価や再現性の高い測定法の確立に必要不可欠であると考えられる。

Report

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

    (3 results)

All 2023 2022 2021

All Journal Article (3 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results)

  • [Journal Article] 最大随意筋力に影響を与える心理的要因2023

    • Author(s)
      宝田雄大
    • Journal Title

      体育科学

      Volume: 73 Pages: 312-316

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
  • [Journal Article] Shouting strengthens voluntary force during sustained maximal effort through enhancement of motor system state via motor commands2022

    • Author(s)
      Takarada Y, Nozaki D
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 16182-16182

    • DOI

      10.1038/s41598-022-20643-4

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The unconscious mental inhibiting process of human maximal voluntary contraction2021

    • Author(s)
      Yudai Takarada, Daichi Nozaki
    • Journal Title

      Psychological Research

      Volume: 1 Issue: 5 Pages: 1-10

    • DOI

      10.1007/s00426-021-01578-3

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi