累积预冷方法在热带气候下不能提高循环性能
Aurélie Collado1, Kévin Rinaldi2, Eric Hermand3
1Université des Antilles, ACTES (UPRES EA 3596), UFR STAPS, Pointe-à-Pitre, France.
PloS one
|October 12, 2023
概括
混合冷却技术,包括含有或不含薄荷的冷却背心,在炎热条件下没有改善骑自行车的性能. 然而,冷却背心确实在热身和骑自行车性能试验期间增强了热舒适度.
科学领域:
- 运动科学 运动科学 运动科学
- 运动生理学 运动生理学
- 环境生理学环境生理学
背景情况:
- 运动员经常在热身期间使用冷却策略来减轻热应激.
- 混合冷却技术结合了内部和外部的温度调节方法.
- 在炎热潮湿的气候下,在运动期间用薄荷注冷却的有效性需要进一步研究.
研究的目的:
- 研究混合冷却技术在热带气候下对自行车性能的影响.
- 评估冷却背心 (冰水或冰薄荷水) 和冷薄荷水在热身期间摄入对表现和生理反应的影响.
- 评估这些冷却策略对感知到的劳动力,热舒适度和热感觉的影响.
主要方法:
- 七名热度适应的男性骑自行车者在炎热和潮湿的条件下完成了三次20分钟的计时试验.
- 热身方案包括摄入冷薄荷水与冰冷水冷却背心 (ICE-VEST),冰薄荷水冷却背心 (MEN-VEST) 或没有背心 (NO-VEST) 结合.
- 测量了表现 (总距离),生理参数 (核心体温,心率) 和主观感知.
主要成果:
- 在ICE-VEST, MEN-VEST和NO-VEST条件之间,没有观察到骑自行车性能 (总距离或速度) 或生理参数的显著差异.
- 随着时间的推移,每个2分钟块的距离减少,这表明节奏变化,但这在所有条件下都是一致的.
- 虽然在NO-VEST条件下热感显著增加,但在ICE-VEST和MEN-VEST条件下保持稳定,这表明冷却背心的热舒适性得到了改善.
结论:
- 混合冷却技术,包括冷却背心和薄荷醇摄入,在炎热潮湿的环境中没有提高骑自行车的性能.
- 穿着冷却背心,不管是否注入薄荷,似乎可以改善运动期间和运动后的热感.
- 进一步的研究可能会探索不同的冷却持续时间,强度或背心设计,以优化极端条件下的性能效益.
相关概念视频
Efficiency of The Carnot Cycle
2.6K
The hypothetical Carnot cycle consists of an ideal gas subjected to two isothermal and two adiabatic processes. Since the internal energy of an ideal gas depends only on its temperature, which is the same before and after the completion of the Carnot cycle, there is no change in its internal energy. Hence, using the first law of thermodynamics, the total heat exchanged by the ideal gas equals the total work done. Thus, we can quantify the efficiency of the Carnot cycle via the heat exchanged...
2.6K
Hot Weather Concreting
70
Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
70
The Carnot Cycle
2.9K
Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
What could be the theoretical limit to the efficiency of a heat engine? The...
What could be the theoretical limit to the efficiency of a heat engine? The...
2.9K
Factors Affecting Body Temperature
4.3K
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:
4.3K
Masonry in Cold and Hot Weather Conditions
91
In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
Other key practices include keeping masonry units...
91
Thermoregulation
1.0K
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,...
1.0K


