运动期间的中央指挥激活是维持潜水勃心脏的重要机制
Marcela S Araújo1, Adamor S Lima1, Rosa V D Guerrero1
1NeuroV̇ASQ̇-Integrative Physiology Laboratory, Faculty of Physical Education, University of Brasília, Brasília, Brazil.
Journal of applied physiology (Bethesda, Md. : 1985)
|June 30, 2025
概括
由于中央指令激活,潜水胸在运动期间持续存在,而外围反射可以抑制这种反应. 了解这些机制可以澄清潜水和运动期间的心血管控制.
科学领域:
- 心血管生理学心血管生理学
- 运动生理学 运动生理学
- 海洋哺乳动物生理学
背景情况:
- 潜水反应的特征是心,在运动期间保持或增强,但底层的整合机制尚不清楚.
- 运动通常会诱导心动减速,与心跳潜水反应产生冲突.
- 阐明潜水诱导的心如何取代运动诱导的低心率对于理解心血管适应至关重要.
研究的目的:
- 研究中央和外围 afferent 机制在调节人类在运动期间的潜水反应中的作用.
- 要区分自愿与被动运动对潜水反射的影响.
- 为了检查冷压器试验 (CPT) 对潜水诱导的胸的影响.
主要方法:
- 32名健康参与者使用三角神经刺激 (TGS) 进行模拟潜水.
- 心血管反应 (心率,血压) 在休息时被测量,自愿的腿循环 (轻度和中度强度),被动循环和CPT,单独和组合.
- 表面电肌图证实,在被动运动期间没有自愿肌肉收缩.
主要成果:
- 三神经刺激 (TGS) 在休息时诱导显著的胸,在轻度炼时增强,在中度炼时保持.
- 在被动炼期间,TGS的胸肌反应减弱,并通过冷压试验 (CPT) 消除.
- 在联合轻量运动和CPT期间,TGS仍然引起了与单独CPT相比显著的胸肌反应.
结论:
- 中央指挥激活对于在运动期间维持潜水诱导的胸肌梗塞至关重要.
- 孤立的外周 afferent 反射可以提供抑制反,调节潜水心反应.
- 中央和外围 afferent反机制都对调节心血管调整到模拟潜水在意志运动期间的调节至关重要.
相关概念视频
01:17Other Factors Affecting Respiration Centers
972
Breathing is primarily an involuntary activity regulated by the brainstem respiratory centers. However, it can also be consciously controlled, allowing us to hold our breath or take deeper breaths when needed. This voluntary control is facilitated by the cerebral motor cortex, which bypasses the medullary centers to stimulate the respiratory muscles directly.
However, the ability to hold one's breath voluntarily is not limitless. When the CO2 concentration in the blood reaches a critical...
However, the ability to hold one's breath voluntarily is not limitless. When the CO2 concentration in the blood reaches a critical...
972
01:20Exercise and Cardiovascular Response
1.1K
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...
1.1K
01:25Cardiopulmonary Resuscitation IV: Pharmacological Management
81
Pharmacologic intervention is crucial in treating cardiac arrest patients during ACLS or Advanced Cardiovascular Life Support. The ACLS algorithms guide the administration of specific drugs based on the patient's cardiac arrest rhythm, which includes pulseless ventricular tachycardia (VT), ventricular fibrillation (VF), asystole, and pulseless electrical activity (PEA).EpinephrineIndication: Epinephrine is the first-line drug for all cardiac arrest rhythms.Mechanism of Action: Epinephrine...
81
01:23Cardiopulmonary Resuscitation III: AED Use
77
Introduction to AEDAn Automated External Defibrillator (AED) is a portable medical device that analyzes the heart's rhythm and, if necessary, delivers an electrical shock to help the heart re-establish an effective rhythm during sudden cardiac arrest (SCA). SCA occurs when the heart suddenly and unexpectedly stops beating, leading to a loss of blood flow to the brain and other vital organs. In such emergencies, time is of the essence, and using an AED, combined with Cardiopulmonary...
77
01:25Hyperpnea and Hyperventilation
1.3K
Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
1.3K
01:16Sympathetic Activation
5.7K
The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...
5.7K