- Research indicates that the upper temperature limit for humans is probably between 40°C, or 104°F, and 50°C, or 122°F.
- Higher temperatures make your body work harder to function.
- Extreme temperatures can lead to heat-related illness and even death.
- Certain groups, such as older people and those with chronic illness, are at greater risk.
- It is important to take steps to keep cool when temperatures are high.
The temperature rise due to climate change is already having devastating effects on the Earth including diminished ice sheets and glaciers, altered geographic ranges for animals and plants, and shifted seasons.
And this week scientists said that on July 4 the Earth recorded its hottest ever day.
As we face increasing temperatures due to climate change, one question scientists have been asking is what is the temperature limit humans can safely tolerate?
Now, Prof. Lewis Halsey and a team of researchers out of the University of Roehampton in London say they may have learned what this temperature range is.
In research that he will be presenting at the SEB Centenary Conference being held in Edinburgh, Scotland, between July 4-7, 2023, Halsey will be discussing his team’s finding that the upper critical temperature (UCT) is likely to be between 40°C and 50°C (104°F and 122°F).
This is significant, according to the study’s authors, because understanding the temperatures that cause our metabolic rate to increase, as well as how this temperature varies for different individuals, can have large implications for workers, athletes, travelers, and medical practitioners.
Ongoing work reveals human temperature limits
Halsey said the findings that he will be presenting are a continuation of work previously published in the journal Physiological Reports.
Dr. Daniel Atkinson, GP Clinical Lead at Treated, who was not a part of the research, said the original study suggests that increased temperatures lead to an increase in metabolic rate.
Metabolic rate, per Atkinson, is the amount of energy your body uses to maintain its normal functions.
“At 40 degrees, metabolic rate increased by 35% compared to baseline (‘normal’) and by a further 13% at 50 degrees (so 48% compared to normal),” he stated.
“So the hotter the conditions, the harder your body has to work to keep your regular functions working.”
Atkinson further said that it’s similar to how a sauna works.
“People sit in saunas to ‘sweat off’ calories,” he explained, “but it’s not just sweating that causes calorie expenditure.
“Higher temperatures make your body work harder to keep your organs functioning, and this uses more calories.”
Halsey said that his presentation will delve into what has been learned since the 2021 study.
“We are finding a smaller mean increase in metabolic rate in response to high temperatures but still noteworthy on average, and in particular in some participants,” he said.
He added, “We are yet to find an association between a characteristic and whether metabolic rate (MR) went up much or not, e.g. not sex specific or age specific.”
Halsey said his team also has new data related to the specifics of how heart function changes in the heat, as well as sex differences between males and females.
One particular difference, he said, is the fact that women have a more pronounced increase in heart rate than men.
Additionally, women show a reduction in the amount the heart muscle shortens when blood is pumped out of the heart.
The dangers of extreme heat
Dr. Naheed Ali, a physician-writer at Healthcare Propulsion in Miami Beach, Florida, who also did not take part in the study, said extreme heat can affect different people in different ways due to a variety of reasons, including age, their overall health, and their individual susceptibility.
“Vulnerable populations, such as the elderly, children, pregnant women, individuals with chronic illnesses, and those with limited access to cooling resources, are often more susceptible to the negative impacts of high temperatures,” he stated.
Factors like socioeconomic status and geographic location can also play a role, per Ali.
Exposure to extreme heat can cause illnesses like heat cramps, exhaustion, and heat stroke, ranging in severity from mild to life-threatening, he added.
Additionally, they can make existing heart and respiratory conditions worse.
“In extreme cases,” he said, “extreme heat events can result in excess mortality, particularly during heatwaves.”
Common symptoms that people might experience due to extreme heat, per Ali, include profuse sweating, dehydration, dizziness, nausea, headache, fatigue, muscle cramps, rapid heartbeat, and confusion.
He noted that heatstroke is the most severe form of heat-related illness. This condition can lead to a high body temperature greater than 103°F, an altered mental state, hot and dry skin, and a lack of sweating. It can also potentially cause death.
How to protect yourself
Atkinson and Ali said that some ways to protect yourself from extreme heat include the following:
- Stay hydrated by drinking plenty of water. Additionally, Ali suggested that you’ll want to avoid caffeine and alcohol since they can be dehydrating.
- Wear lighter-colored clothes that are loose-fitting and lightweight. This allows for sweat to evaporate and cool your body, according to Ali.
- Try to stay indoors when it’s hot. Atkinson noted that between 11 a.m. to 3 p.m. is generally the hottest time of the day.
- Keep your home or workplace well-ventilated. Use air conditioners or fans to keep cool, advised Ali.
- Close your curtains to block out sunlight. You’ll especially want to do this for windows that face the sun, said Atkinson.
- Avoid intense exercise on hotter days. According to the Academy of Nutrition and Dietetics, this can quickly raise your core temperature, putting you at even greater risk for heat exhaustion or heat stroke.
- Be aware of local weather forecasts and heat advisories. The National Weather Service provides heat alerts when extreme weather events are anticipated.
Ali further noted that it’s important to keep an eye on those who are particularly vulnerable, such as older people and those with chronic illnesses, to make sure they are able to keep cool.
“If necessary, [seek] medical attention for severe symptoms or [seek] shelter in designated cooling centers during heatwaves,” he concluded.
The Earth Just Hit a Heat Record, How Hot is Too Hot for Humans
Source: Pinoy Lang Sakalam
0 (mga) komento:
Mag-post ng isang Komento