在寒冷暴露期间,图瓦牧民和西欧人的温度调节
Adam J Sellers1, Dolaana Khovalyg2, Wouter van Marken Lichtenbelt1
1Department of Nutrition and Movement Sciences, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, The Netherlands.
概括
与西欧人相比,终身暴露于极端寒冷的图瓦人表现出肢体血管收缩减少. 这种增强的血液流动可以提高灵敏度,减少寒冷环境中的寒冷伤害风险.
科学领域:
- 人类生理学 人类生理学
- 环境适应环境适应
- 暴露于寒冷的研究研究.
背景情况:
- 传统种群对极端环境具有独特的生理适应性.
- 了解寒冷适应机制对于公共卫生和职业安全至关重要.
研究的目的:
- 为了比较图瓦成年人和西欧人的寒冷暴露的代谢和血管反应.
- 为了研究冷气诱导的热生成和外周血流的差异.
主要方法:
- 进行了全身冷空气暴露 (10°C) 和冷诱导血管扩张 (CIVD) 测试.
- 参与者包括13名寒冷适应的图瓦成年人和13名匹配的西欧对照.
- 监测了新陈代谢率 (能量消耗) 和外围皮肤温度.
主要成果:
- 群体之间,发的开始和寒冷暴露期间的能量消耗在组之间是相似的.
- 与欧洲人相比,图瓦人表现出极端血管收缩明显较少.
- 寒冷诱导血管扩张 (CIVD) 反应发生在 92% 的图瓦人,而欧洲人则为 36%.
结论:
- 在寒冷的条件下,Tuvans表现出降低了外周血管收缩,表明血液流向 extremities 的增强.
- 这种适应可能会在极度寒冷的情况下带来优势,例如提高灵巧性和降低寒冷伤害风险.
- 这些发现突出了不同人群之间寒冷适应的独特生理策略.
相关概念视频
01:26Thermoregulation
1.1K
The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
1.1K
01:29Decreased Body Temperature
657
A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
657
02:45Responses to Heat and Cold Stress
13.6K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
13.6K
01:25Body Temperature
1.1K
The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
1.1K
01:28Factors Affecting Body Temperature
4.5K
As a nurse, it is vital to understand the factors affecting body temperature to monitor variations and effectively evaluate deviations from regular.
Factors may include:
Factors may include:
4.5K
01:26Requirements for Human Life
8.3K
The Earth and its atmosphere have provided humans with air, water, and food, but these are not the only requirements for survival. Humans also require a specific range of temperature and pressure that the Earth and its atmosphere provides.
Oxygen
Atmospheric air is only about 20 percent oxygen, but that oxygen is a key component of the chemical reactions that keep the body alive, including the reactions that produce ATP. Brain cells are susceptible to a lack of oxygen because they require a...
Oxygen
Atmospheric air is only about 20 percent oxygen, but that oxygen is a key component of the chemical reactions that keep the body alive, including the reactions that produce ATP. Brain cells are susceptible to a lack of oxygen because they require a...
8.3K