エアロビックフィットネスは,運動トレーニングと脱トレーニングにおける心筋細胞の収縮能力と内皮機能と関連しています
Ole Johan Kemi1, Per Magnus Haram, Ulrik Wisløff
1Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway.
Circulation
|June 3, 2004
まとめ
定期的な運動は,心筋細胞の機能を変化させることで,心血管の健康と最大酸素摂取量 (VO2max) を高めます. しかし,これらの獲得は,脱トレーニング時に急速に失われ,運動適応のダイナミックな性質を強調します.
科学分野:
- 心血管生理学 心血管の生理学
- 運動科学は運動科学である.
- 細胞生物学 細胞生物学
背景:
- 身体的フィットネスと定期的な運動は,心血管の健康と密接に関連しています.
- 運動能力と最大酸素摂取量 (VO2max) の背後にある細胞メカニズムを理解することは極めて重要です.
研究 の 目的:
- 運動能力とVO2maxの細胞メカニズムを調査する.
- ネズミの心筋細胞機能とVO2maxに対する運動訓練とその後の脱トレーニングの影響を評価する.
主な方法:
- 成人ラットは,トレードミルの制御下での走行を最大13週間行い,その後,2週と4週間の脱走期間を行いました.
- 測定には,心筋細胞の大きさ,収縮性,Ca2+処理,VO2max,および内皮に依存する血管リラックスが含まれていました.
- 多重回帰を含む統計分析を使用して,VO2maxの主要な決定因子を特定しました.
主要な成果:
- 運動トレーニングにより,心筋細胞のサイズが増加し,収縮機能が改善され,VO2maxが増加し,細胞長さとCa2+の衰退が重要な予測要因となった.
- 脱トレーニング後,VO2maxは2週間以内に著しく低下し,ほとんどの獲得は4週間以内に失われました.
- 心筋細胞の大きさと収縮機能は逆行し,血管リラックスが4週間以内に完全に失われ,細胞長と血管リラックスがVO2maxの減少を予測した.
結論:
- 運動に対する心血管の適応は,ダイナミックで,脱トレーニングに敏感です.
- 運動によるエアロビックフィットネスの有意な部分は,トレーニングを中止した後すぐに失われます.
- 心筋細胞の特徴,血管機能,およびエアロビック能力の間の密接な関係は,これらの適応のための基本的な細胞機構を示唆しています.
さらに関連する動画
09:04Skeletal Muscle Neurovascular Coupling, Oxidative Capacity, and Microvascular Function with 'One Stop Shop' Near-infrared Spectroscopy
Published on: February 20, 2018
12.1K
02:47Author Spotlight: Exercise Test for Evaluation of the Functional Efficacy of the Pig Cardiovascular System
Published on: May 12, 2023
2.2K
関連する概念動画
01:27Exercise and Muscle Performance
6.2K
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...
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...
6.2K
01:13Structure of Cardiac Muscles
17.0K
Cardiac muscle, or myocardium, is a specialized type of muscle found exclusively in the heart. Its unique structural and functional characteristics enable the heart to perform its vital role of pumping blood throughout the body continuously and rhythmically. The cardiac muscle cells, or cardiomyocytes, possess an endomysium and perimysium but do not have an epimysium.
Compared to skeletal muscles, cardiac muscle cells are small and mostly have a single nucleus. Additionally, they are usually...
Compared to skeletal muscles, cardiac muscle cells are small and mostly have a single nucleus. Additionally, they are usually...
17.0K
01:27Specialized Characteristics of Cardiac Muscles
6.9K
The primary role of cardiac muscles is to propel blood throughout the cardiovascular system. The cardiac muscle cells, or cardiomyocytes, exhibit specialized characteristics that allow them to perform this function.
Cardiac muscle cells are smaller than skeletal muscles, averaging 10–20 mm in diameter and 50–100 mm in length. However, they have large energy demands for continuous contraction and relaxation. This energy is almost exclusively derived from aerobic metabolism of energy...
Cardiac muscle cells are smaller than skeletal muscles, averaging 10–20 mm in diameter and 50–100 mm in length. However, they have large energy demands for continuous contraction and relaxation. This energy is almost exclusively derived from aerobic metabolism of energy...
6.9K
01:29Pathophysiology of Cardiac Performance
2.2K
Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
2.2K
01:17Exercise and Cardiac Output
4.0K
Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be...
Sustained exercise increases the muscles' oxygen demand, which can be...
4.0K
01:20Exercise and Cardiovascular Response
6.9K
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...
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...
6.9K