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関連する概念動画

Exercise and Muscle Performance01:27

Exercise and Muscle Performance

1.6K
Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
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Microscopic Anatomy of Skeletal Muscles01:13

Microscopic Anatomy of Skeletal Muscles

15.0K
Skeletal muscle cells, also called muscle fibers, are distinctly elongated, multi-nucleated, slender biological units. They are packed with specialized structures designed to facilitate their primary function, which is contraction.
The muscle sarcolemma is a plasma membrane enclosing each muscle cell that conducts electrical signals called action potentials. The sarcolemma extends into the cell to form T-tubules, ensuring the neural impulses are uniformly distributed across the entire muscle...
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Energy Supply for Muscle Contraction01:25

Energy Supply for Muscle Contraction

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Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...
3.7K
Overview of Skeletal Muscle01:15

Overview of Skeletal Muscle

12.4K
Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
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Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
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Cross-bridge Cycle01:26

Cross-bridge Cycle

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As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
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関連する実験動画

Updated: Sep 9, 2025

Measurement of Insulin- and Contraction-Stimulated Glucose Uptake in Isolated and Incubated Mature Skeletal Muscle from Mice
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Measurement of Insulin- and Contraction-Stimulated Glucose Uptake in Isolated and Incubated Mature Skeletal Muscle from Mice

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骨格筋Rac1は,筋肉のグリコゲン再合成とタンパク質合成に対する運動トレーニングの適応を媒介する.

Steffen H Raun1, Carlos Henriquez-Olguín2, Emma Frank1

  • 1The Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.

Redox biology
|August 31, 2025
PubMed
まとめ

Rho GTPase Rac1は運動への筋肉の適応に不可欠です. Rac1の喪失は筋肉の成長と運動能力を損なうので,骨格筋のトレーニングに対する反応におけるその役割を強調する.

キーワード:
収縮する運動訓練グリコゲンメタボリズム筋肉の縮タンパク質合成ラック1骨格筋

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Human Skeletal Muscle Biopsy Procedures Using the Modified Bergström Technique
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Application of Chronic Stimulation to Study Contractile Activity-induced Rat Skeletal Muscle Phenotypic Adaptations
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関連する実験動画

Last Updated: Sep 9, 2025

Measurement of Insulin- and Contraction-Stimulated Glucose Uptake in Isolated and Incubated Mature Skeletal Muscle from Mice
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Measurement of Insulin- and Contraction-Stimulated Glucose Uptake in Isolated and Incubated Mature Skeletal Muscle from Mice

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Human Skeletal Muscle Biopsy Procedures Using the Modified Bergström Technique
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Application of Chronic Stimulation to Study Contractile Activity-induced Rat Skeletal Muscle Phenotypic Adaptations
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Application of Chronic Stimulation to Study Contractile Activity-induced Rat Skeletal Muscle Phenotypic Adaptations

Published on: January 25, 2018

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科学分野:

  • 運動生理学
  • 分子生物学
  • 骨格筋の生物学

背景:

  • 長期にわたる運動は 健康に有益ですが 分子機構は不明です
  • 運動後の骨格筋ではRho GTPases,特にRac1が著しく変化しています.
  • 運動を媒介する分子標的を特定することは 治療開発に不可欠です

研究 の 目的:

  • 運動訓練への骨格筋の適応におけるRho GTPase Rac1の役割を調査する.
  • Rac1 が運動に対する筋肉の反応に影響を与える分子経路を解明する.
  • 筋肉の性能と適応に対する Rac1 調節の機能的影響を決定する.

主な方法:

  • 急性運動後の人間の骨格筋のRac1活性化の分析
  • 筋肉特有のRac1欠乏症または機能増強を有する遺伝的マウスモデルを使用する.
  • ウェスタン・ブロッティング,ランニング・キャパシティ・テスト,筋肉増縮の評価,質量スペクトロメトリーベースのプロテオミクスを採用する.

主要な成果:

  • Rac1の活性化は,運動後のヒトの骨格筋で急激に観察された.
  • マウスにおける筋肉特有のRac1喪失は,タンパク質の合成,運動能力,および過剰増殖を減少させた.
  • Rac1はNOX2依存の経路を通じてグリコゲン再合成を調節し,収縮誘発信号に不可欠であることが判明しました.
  • プロテオミク解析により,Rac1は細胞骨格の組織,筋肉の適応,およびリボソーム経路に影響を及ぼすことが明らかになった.

結論:

  • 骨格筋Rac1は,運動訓練に対する分子的および機能的適応の両方の重要な媒介です.
  • Rac1は,運動誘発の筋肉のタンパク質合成,パフォーマンス向上,および多発性において重要な役割を果たします.
  • Rac1をターゲットにすることで,筋肉の健康と運動反応を高めるための治療戦略が提供されます.