Heat and dehydration literature reviews

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Heat and dehydration literature reviews

August 14, But why does being out in the heat bring on feelings of drowsiness?

Acute and chronic effects of hydration status on health | Nutrition Reviews | Oxford Academic

The reason for this lethargy is simple: Your body is working hard to keep you cool, and this extra labor makes you feel tired, said Dr. For instance, it dilates your blood vessels, a process known as vasodilation, which allows more blood to flow near the skin's surface.

This allows warm blood to cool off, releasing heat as it travels near the skin, Casey said. This increased blood flow near the skin explains why some people look redder when they're feeling hot, according to the BBC.

Most common sources of heat

In addition to vasodilation, the body secretes sweat onto the skin. This sweat then cools the skin as it evaporates, Casey said. Furthermore, most people spend their lives slightly dehydrated. Being hot and sweaty only worsens that dehydration, and a symptom of dehydration is fatigue, she noted.

Getting skin damage from the sun can also heighten dehydration. When the sun's rays beam down on your skin, it can cause pigmentation changes, wrinkles and burns. What's more, when you sunburn, your body diverts fluid from the rest of the body toward the burn in an attempt to heal the skin.

This diversion means you have less fluid overall for sweating, which can lead to more dehydration and fatigue, Casey said.

What to do Often, people who are feeling hot might try to cool down with a cool drink, such as alcohol.

Heat and dehydration literature reviews

But alcohol is a diuretic, meaning it may only increase dehydration, Casey said. Coffee, on the other hand, is actually not a diureticaccording to recent studies. But the best way to fight dehydration is with water and a salty snack, such as pretzels or baked potato chips, Casey said.

She advised people to be aware of the symptoms of heat exhaustion: This condition requires emergency treatment, as it can lead to damage to the brain, heart, kidneys and muscle.

Symptoms include high body temperature, nausea, vomiting, headache and changes in behavior, such as confusion, agitation or irritability. Other symptoms are slurred speech, seizures or coma.

To cool down, Casey advised going to a cooler environment, such as the shade or an air-conditioned area, especially during the hottest hours between 10 a. It's also important to stay hydratedshe said.

Original article on Live Science.Abstract. The formation of deposits on heat transfer surfaces is an important problem during convective and nucleate boiling heat transfer to water.

Dysphagia and dehydration after a Stroke: A Literature Review Background. Stroke is a major cause of mortality in the United Kingdom; it is the third biggest killer in the UK (National audit office ) around 53, people . A series of novels written by Eoin Colfer.. Originally, the tale of an Irish pubescent evil genius and his efforts to acquire money and power by exploiting the secret underground world of fairies using both magic and advanced supertechnology.

Intermittent Fasting Women: Problems in the Literature

In later books in the series, he becomes a more benevolent fellow, working cooperatively with the fairies to curtail human mischief. SWEATING AND DEHYDRATION. Evaporative cooling (sweating) is the most effective method that humans use to limit the rise in core temperature Kovacs, ).

Sweating is maintained by intracellular water shifting to the extracellular space, which results in cell dehydration. The goal of adequate hydration is to limit fluid loss from sweat and . Dehydration is the most common fluid and electrolyte problem among the elderly.

The purpose of this review is to summarize the literature on . If you're out and about on a sweltering day, it probably won't be long before you start to feel tired and sluggish. But why does being out in the heat bring on feelings of drowsiness?

Water, hydration, and health | Nutrition Reviews | Oxford Academic