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関連する概念動画

Exercise Stress Test01:26

Exercise Stress Test

489
Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
489
Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
1.1K
Radical Autoxidation01:20

Radical Autoxidation

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
2.2K
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

2.5K
Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Stress Concentrations01:24

Stress Concentrations

374
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
374

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Updated: Sep 9, 2025

Imaging Approaches to Assessments of Toxicological Oxidative Stress Using Genetically-encoded Fluorogenic Sensors
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オキシダティブ・ストレスは,カレッジ・クロス・カントリー・スキーヤーで,中期と後期に

Scott P Jerome1, Kriya L Dunlap1,2, Ava M Parrish1

  • 1Department of Chemistry & Biochemistry, University of Alaska Fairbanks, Fairbanks, AK, USA.

Journal of biosciences and medicines
|August 29, 2025
PubMed
まとめ

過剰トレーニング症候群は 酸化ストレスと関係があるかもしれません 性能の低下を経験した耐久性アスリートは,性能の低下のない人と比較して,シーズン後の回復中により高い酸化ストレスマーカーを示した.

キーワード:
4-ヒドロキシノネナルアスリート の 業績酸化ストレススーパーオキシド・ディスミュータゼ訓練マクロサイクル

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科学分野:

  • 運動 生理学
  • 生物化学
  • スポーツ科学

背景:

  • 酸化ストレス (OS) 仮説は,激しい運動中にフリーラジカルの生成が増加すると,筋肉の疲労とパフォーマンスの低下につながることを示唆しています.
  • 以前の研究では,トレーニングマクロサイクル内の運動直前と運動直後のOSマーカーを調査しました.

研究 の 目的:

  • 競技マクロサイクルと,その後の回復マクロサイクル間の耐久力アスリートのOSを比較する.
  • 競技シーズン中に原因不明のパフォーマンスの低下を経験した選手を特定し,そのOSレベルを,そうでない選手と比較する.

主な方法:

  • 15人のクロスカントリースキーチームのメンバーが シーズン半ばとシーズン後の血液サンプルを提供した.
  • 血は4-ヒドロキシノネナル (HNE),ニトロチロシン,窒素酸化物 (NOX),超酸化物ディスミュータゼ (SOD) について分析された.
  • 統計的有意性は,ウィルコクソンとマン・ウィートニー試験を用いて決定された.

主要な成果:

  • スーパーオキシド・ディスミュータゼ (SOD) の活性度は,シーズン中期と比較して,シーズン後期において有意に高かった.
  • 6人のアスリート (6D) は説明不能なパフォーマンスの低下を報告した.
  • 6Dグループは,パフォーマンスの低下のないアスリートと比較して,シーズン後のHNE濃度が有意に高かった.

結論:

  • 競技シーズン中にパフォーマンスの低下を報告したアスリートは,シーズン後の回復期間に酸化ストレスと緩和の兆候を高めた.
  • 発見は,酸化ストレスマーカーと耐久力アスリートのパフォーマンスの低下との潜在的な関連を示唆しています.