运动开始时的中央和外围血动力学:中央指挥的作用
Gaia Giuriato1,2, Stephen J Ives3, Cantor Tarperi4
1Department of Neuroscience, Biomedicine and Movement Sciences, University of Verona, Verona, Italy. gaia.giuriato@univr.it.
European journal of applied physiology
|May 31, 2024
概括
中央指挥部参与运动血液动力学是有争议的. 这项研究发现,在电气引起和自愿收缩期间,中央和外围血液动力学的初始反应相似,这表明运动开始时中央指挥的影响最小.
科学领域:
- 运动生理学 运动生理学
- 心血管监管 监管心血管系统
- 神经科学是一个神经科学.
背景情况:
- 中央指挥部在运动血液动力学中的作用已经确立,但其在低强度运动开始时的外围影响尚不清楚.
- 了解这种相互作用对于理解运动适应和生理反应至关重要.
研究的目的:
- 为了研究和比较在电力引起的收缩 (没有中央命令) 和自愿肌肉活动 (有中央命令) 期间的中央和外周血动力学反应.
- 阐明中央指挥在低强度运动开始时对外围血液动力学的贡献.
主要方法:
- 十个健康的男性在匹配的力输出时执行了循环四头肌同度收缩.
- 收缩是电气引起的 (ES) 或自愿的 (VC).
- 分析了周围 (股骨血流,血管导电) 和中央 (心率,中风体积,心脏输出,平均动脉压) 血液动力学.
主要成果:
- 两个ES和VC组在运动开始时显示出类似的部血流峰值和血管导电性.
- 心率,中风量,心率和平均动脉压在ES和VC试验之间也表现出可比的峰值值.
- 在两种条件下,血液动力学变量表现出类似的反应,在两种条件下大约50秒后向下漂移.
结论:
- 在低强度收缩期间,中央和外周血动力学最初的增加似乎遵循类似的路径.
- 这些平行反应表明,在演习的早期阶段,中央指挥部的作用很小.
- 这可能归因于神经驱动激活的延迟或值.
相关概念视频
01:20Exercise and Cardiovascular Response
784
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...
784
01:19Cardiac Output I:Effect of Heart Rate on Cardiac Output
742
Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart...
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart...
742
01:29Pathophysiology of Cardiac Performance
635
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...
635
01:17Exercise and Cardiac Output
985
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...
985
01:17Autoregulation of Blood Flow
2.3K
Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation....
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation....
2.3K
01:22Cardiac Output II: Effect of Stroke Volume on Cardiac Output
847
Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
847