Children can be more vulnerable in the heat. Here’s how to protect them this summer
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Extreme heat is increasingly common in Australia and around the world and besides making us uncomfortable, it can harm our health. For example, exposure to extreme heat can exacerbate existing medical conditions, or cause problems such as heat stroke.
Due to a combination of physiology and behaviour, children are potentially more vulnerable to severe heat-related illness such as heat stroke or heat exhaustion.
But these are not the only heat-related health issues children might experience on a very hot day. In a new study, we looked at emergency department (ED) visits and unplanned hospital admissions among children in New South Wales on heatwave days.
We found a significant increase in children attending hospital compared to milder days – with a range of health issues.
Why are children more vulnerable in the heat?
Sweating is the main way we lose heat from our bodies and cool down.
Children have a greater skin surface area to body mass ratio, which can be an advantage for sweating – they can lose more heat through evaporation for a given body mass. But this also means children can lose fluids and electrolytes faster through sweating, theoretically making them more susceptible to dehydration.
Meanwhile, younger children, particularly babies, can’t sweat as much as older children and adults. This means they can’t cool down as effectively.
Children in general also tend to engage in more outdoor physical activity, which might see them more exposed to very hot temperatures.
Further, children may be less in-tune to the signals their body is giving them that they’re overheating, such as excessive sweating or red skin. So they might not stop and cool down when they need to. Young children especially may not recognise the early signs of heat stress or be able to express discomfort.
Our study
We wanted to examine children’s exposure to extreme heat stress and the associated risks to their health.
We measured extreme heat as “heatwave days”, at least two consecutive days with a daily maximum temperature above the 95th percentile for the relevant area on a universal thermal climate index. This ranged from 27°C to 45°C depending on the area.
We assessed health outcomes by looking at ED visits and unplanned hospital admissions among children aged 0–18 years from NSW between 2000 and 2020. This totalled around 8.2 million ED visits and 1.4 million hospital admissions.
We found hospital admissions for heat-related illness were 104% more likely on heatwave days compared to non-heatwave days, and ED visits were 78% more likely. Heat-related illness includes a spectrum of disorders from minor conditions such as dehydration to life-threatening conditions such as heat stroke.
But heat-related illness wasn’t the only condition that increased on heatwave days. There was also an increase in childhood infections, particularly infectious enteritis possibly related to food poisoning (up 6% for ED visits and 17% for hospital admissions), ear infections (up 30% for ED visits and 3% for hospital admissions), and skin and soft tissue infections (up 6% for ED visits and 4% for hospital admissions).
We know many infectious diseases are highly seasonal. Some, like the flu, peak in winter. But heat and humidity increase the risk of certain infections caused by bacterial, viral and fungal pathogens.
For example, warmer weather and higher humidity can increase the survival of bacteria, such as Salmonella, on foods, which increases the risk of food poisoning.
Hot weather can also increase the risk of ear infections. Children may be at greater risk during hot weather because they often swim or play at the beach or pool. Water can stay in the ear after swimming and a moist environment in the ear canal can cause growth of pathogens leading to ear infections.
Which children are most vulnerable?
During heatwaves, we found infants aged under one were at increased risk of ED visits and hospital admission for any reason compared to older children. This is not surprising, because babies can’t regulate their body temperature effectively and are reliant on their caregivers to keep them cool.
Our study also found children from the most disadvantaged areas were more vulnerable to heat-related illness on heatwave days. Although we don’t know exactly why, we hypothesised families from poorer areas might have limited access to air-conditioning and could be more likely to live in hotter neighbourhoods.
Keeping kids cool: tips for parents
The highest levels of heat exposure on hot days for young children is usually when they’re taken outside in prams and strollers. To protect their children from direct sunlight, parents often instinctively cover their stroller with a cloth such as a muslin.
However, a recent study from our group showed this actually increases temperatures inside a stroller to as much as 3–4˚C higher than outside.
But if the cloth is wet with water, and a small fan is used to circulate the air close to the child, stroller temperatures can be 4–5˚C lower than outside. Wetting the cloth every 15–20 minutes (for example, with a spray bottle) maintains the cooling effect.
When young children are not in a stroller, and for older children, there are a few things to consider to keep them cool and safe.
Remember temperatures reported on weather forecasts are measured in the shade, and temperatures in the sun can be up to 15˚C higher. So sticking to the shade as much as possible is important.
Exercise generates heat inside the body, so activities should be shortened, or rescheduled to cooler times of the day.
Sunscreen and hats are important when outdoors, but neither are especially effective for keeping cool. Spraying water on the child’s skin – not just the face but arms, legs and even the torso if possible – can help. Wetting their hats is another idea.
Proper hydration on hot days is also essential. Regular water breaks, including offering water before, during and after activity, is important. Offering foods with high water content such as watermelon and orange can help with hydration too.
Wen-Qiang He, Research Fellow in Biostatistics and Epidemiology, Faculty of Medicine and Health, University of Sydney; James Smallcombe, Post-doctoral Research Associate, Faculty of Medicine and Health, University of Sydney; Natasha Nassar, Professor of Paediatric and Perinatal Epidemiology and Chair in Translational Childhood Medicine, University of Sydney, and Ollie Jay, Professor of Heat & Health; Director of Heat & Health Research Incubator; Director of Thermal Ergonomics Laboratory, University of Sydney
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Edamame vs Brussels Sprouts – Which is Healthier?
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Our Verdict
When comparing edamame to Brussels sprouts, we picked the edamame.
Why?
We were curious to see if something could unseat Brussels sprouts from the vegetable throne!
In terms of macros, edamame have more than 3x the protein and and nearly 50% more fiber, for the same amount of carbs. An easy win for edamame.
In the category of vitamins, edamame have more of vitamins B1, B2, B3, B5, B9, and choline, while Brussels sprouts have more of vitamins A, B6, C, E, and K, meaning a marginal 6:5 win for edamame this time.
When it comes to minerals, things are quite one-sided: edamame have more calcium, copper, iron, magnesium, manganese, phosphorus, potassium, and zinc, while Brussels sprouts have more selenium. Another easy win for edamame!
Adding up the sections makes it clear that edamame win the day, but of course, by all means, enjoy either or both; diversity is good!
Want to learn more?
You might like to read:
What Do The Different Kinds Of Fiber Do? 30 Foods That Rank Highest
Enjoy!
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Which Comes First, Cardio or Weights? – by Alex Hutchinson
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This is a book of questions and answers, myths and busts, and in short, all things exercise.
It’s laid out as many micro-chapters with questions as headers. The explanations are clear and easy to understand, with several citations (of studies and other academic papers) per question.
While it’s quite comprehensive (weighing in at a hefty 300+ pages), it’s not the kind of book where one could just look up any given piece of information that one wants.
Its strength, rather, lies in pre-emptively arming the reader with knowledge, and correcting many commonly-believed myths. It can be read cover-to-cover, or just dipped into per what interests you (the table of contents lists all questions, so it’s easy to flip through).
Bottom line: if you’ve found the world of exercise a little confusing and would like it demystifying, this book will result in a lot of “Oooooh” moments.
Click here to check out Which Comes First, Cardio or Weights?, and know your stuff!
PS: the short answer to the titular question is “mix it up and keep it varied”
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Bird flu has been detected in a pig in the US. Why does that matter?
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The United States Department of Agriculture last week reported that a pig on a backyard farm in Oregon was infected with bird flu.
As the bird flu situation has evolved, we’ve heard about the A/H5N1 strain of the virus infecting a range of animals, including a variety of birds, wild animals and dairy cattle.
Fortunately, we haven’t seen any sustained spread between humans at this stage. But the detection of the virus in a pig marks a worrying development in the trajectory of this virus.
David MG/Shutterstock How did we get here?
The most concerning type of bird flu currently circulating is clade 2.3.4.4b of A/H5N1, a strain of influenza A.
Since 2020, A/H5N1 2.3.4.4b has spread to a vast range of birds, wild animals and farm animals that have never been infected with bird flu before.
While Europe is a hotspot for A/H5N1, attention is currently focused on the US. Dairy cattle were infected for the first time in 2024, with more than 400 herds affected across at least 14 US states.
Bird flu has enormous impacts on farming and commercial food production, because infected poultry flocks have to be culled, and infected cows can result in contaminated diary products. That said, pasteurisation should make milk safe to drink.
While farmers have suffered major losses due to H5N1 bird flu, it also has the potential to mutate to cause a human pandemic.
Birds and humans have different types of receptors in their respiratory tract that flu viruses attach to, like a lock (receptors) and key (virus). The attachment of the virus allows it to invade a cell and the body and cause illness. Avian flu viruses are adapted to birds, and spread easily among birds, but not in humans.
So far, human cases have mainly occurred in people who have been in close contact with infected farm animals or birds. In the US, most have been farm workers.
The concern is that the virus will mutate and adapt to humans. One of the key steps for this to happen would be a shift in the virus’ affinity from the bird receptors to those found in the human respiratory tract. In other words, if the virus’ “key” mutated to better fit with the human “lock”.
A recent study of a sample of A/H5N1 2.3.4.4b from an infected human had worrying findings, identifying mutations in the virus with the potential to increase transmission between human hosts.
Why are pigs a problem?
A human pandemic strain of influenza can arise in several ways. One involves close contact between humans and animals infected with their own specific flu viruses, creating opportunities for genetic mixing between avian and human viruses.
Pigs are the ideal genetic mixing vessel to generate a human pandemic influenza strain, because they have receptors in their respiratory tracts which both avian and human flu viruses can bind to.
This means pigs can be infected with a bird flu virus and a human flu virus at the same time. These viruses can exchange genetic material to mutate and become easily transmissible in humans.
The Conversation, CC BY-SA Interestingly, in the past pigs were less susceptible to A/H5N1 viruses. However, the virus has recently mutated to infect pigs more readily.
In the recent case in Oregon, A/H5N1 was detected in a pig on a non-commercial farm after an outbreak occurred among the poultry housed on the same farm. This strain of A/H5N1 was from wild birds, not the one that is widespread in US dairy cows.
The infection of a pig is a warning. If the virus enters commercial piggeries, it would create a far greater level of risk of a pandemic, especially as the US goes into winter, when human seasonal flu starts to rise.
How can we mitigate the risk?
Surveillance is key to early detection of a possible pandemic. This includes comprehensive testing and reporting of infections in birds and animals, alongside financial compensation and support measures for farmers to encourage timely reporting.
Strengthening global influenza surveillance is crucial, as unusual spikes in pneumonia and severe respiratory illnesses could signal a human pandemic. Our EPIWATCH system looks for early warnings of such activity, which can speed up vaccine development.
If a cluster of human cases occurs, and influenza A is detected, further testing (called subtyping) is essential to ascertain whether it’s a seasonal strain, an avian strain from a spillover event, or a novel pandemic strain.
Early identification can prevent a pandemic. Any delay in identifying an emerging pandemic strain enables the virus to spread widely across international borders.
Australia’s first human case of A/H5N1 occurred in a child who acquired the infection while travelling in India, and was hospitalised with illness in March 2024. At the time, testing revealed Influenza A (which could be seasonal flu or avian flu), but subtyping to identify A/H5N1 was delayed.
This kind of delay can be costly if a human-transmissible A/H5N1 arises and is assumed to be seasonal flu because the test is positive for influenza A. Only about 5% of tests positive for influenza A are subtyped further in Australia and most countries.
In light of the current situation, there should be a low threshold for subtyping influenza A strains in humans. Rapid tests which can distinguish between seasonal and H5 influenza A are emerging, and should form part of governments’ pandemic preparedness.
A higher risk than ever before
The US Centers for Disease Control and Prevention states that the current risk posed by H5N1 to the general public remains low.
But with H5N1 now able to infect pigs, and showing worrying mutations for human adaptation, the level of risk has increased. Given the virus is so widespread in animals and birds, the statistical probability of a pandemic arising is higher than ever before.
The good news is, we are better prepared for an influenza pandemic than other pandemics, because vaccines can be made in the same way as seasonal flu vaccines. As soon as the genome of a pandemic influenza virus is known, the vaccines can be updated to match it.
Partially matched vaccines are already available, and some countries such as Finland are vaccinating high-risk farm workers.
C Raina MacIntyre, Professor of Global Biosecurity, NHMRC L3 Research Fellow, Head, Biosecurity Program, Kirby Institute, UNSW Sydney and Haley Stone, Research Associate, Biosecurity Program, Kirby Institute & CRUISE lab, Computer Science and Engineering, UNSW Sydney
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Death by Food Pyramid – by Denise Minger
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This one is less about “here’s the perfect way of eating” or even “these specific foods are ontologically evil”, but more about teaching science literacy.
The author explores various health trends from the 70s until time of writing (the book was published in 2014), what rationales originally prompted them, and what social phenomena either helped them to persist, or caused them to get dropped quite quickly.
Of course, even in the case of fads that are societally dropped quite quickly, on an individual level there will always be someone just learning about it for the first time, reading some older material, and thinking “that sounds like just the miracle life-changer I need!”
What she teaches the reader to do is largely what we do a lot of here at 10almonds—examine the claims, go to the actual source material (studies! Not just books about studies!), and see whether the study conclusions actually support the claim, to start with, and then further examine to see if there’s some way (or sometimes, a plurality of ways) in which the study itself is methodologically flawed.
Which does happen sometimes, do actually watch out for that!
The style is quite personal and entertaining for the most part, and yet even moving sometimes (the title is not hyperbole; deaths will be discussed). As one might expect of a book teaching science literacy, it’s very easy to read, with copious footnotes (well, actually they are at the back of the book doubling up as a bibliography, but they are linked-to throughout) for those who wish to delve deeper—something the author, of course, encourages.
Bottom line: if you’d like to be able to sort the real science from the hype yourself, then this book can set you on the right track!
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Beet “Kvass” With Ginger
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Kvass is a popular drink throughout Eastern Europe, with several countries claiming it, but the truth is, kvass is older than nations (as in: nations, in general, any of them; nation states are a newer concept than is often realized), and its first recorded appearance was in the city state of Kyiv.
This one is definitely not a traditional recipe, as kvass is usually made from rye, but keeping true to its Eastern European roots with (regionally popular) beetroot, it’s nevertheless a great fermented drink, full of probiotic benefits, and this time, with antioxidants too.
It’s a little saltier than most things we give recipes for here, so enjoy it on hot sunny days as a great way to replenish electrolytes!
You will need (for 1 quart / 1 liter)
- 2¾ cups filtered or spring water
- 2 beets, roughly chopped
- 1 tbsp chopped fresh ginger
- 2 tsp salt (do not omit or substitute)
Method
(we suggest you read everything at least once before doing anything)
1) Sterilize a 1-quart jar with boiling water (carefully please)
2) Put all the ingredients in the jar and stir until the salt dissolves
3) Close the lid tightly and store in a cool dark place to ferment for 2 weeks
4) Strain the beets and ginger (they are now pickled and can be enjoyed in a salad or as a kimchi-like snack), pouring the liquid into a clean jar/bottle. This can be kept in the fridge for up to a month. Next time you make it, if you use ¼ cup of this as a “starter” to replace an equal volume of water in the original recipe, the fermentation will take days instead of weeks.
5) Serve! Best served chilled, but without ice, on a hot sunny day.
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Making Friends With Your Gut (You Can Thank Us Later)
- What To Eat, Take, And Do Before A Workout
- Ginger Does A Lot More Than You Think
Take care!
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Unfuck Your Brain – by Dr. Faith Harper
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This book takes a trauma-informed care approach, which is relatively novel in the mental health field and it’s quickly becoming the industry standard because of its effectiveness.
The basic premise of trauma-informed care is that you had a bad experience (possibly even more than one—what a thought!) and that things that remind you of that will tend to prompt reactivity from you in a way that probably isn’t healthy. By identifying each part of that process, we can then interrupt it, much like we might with CBT (the main difference being that CBT, for all its effectiveness, tends to assume that the things that are bothering you are not true, while TIC acknowledges that they might well be, and that especially historically, they probably were).
A word of warning: if something that triggers a trauma-based reactivity response in you is people swearing, then this book will either cure you by exposure therapy or leave you a nervous wreck, because it’s not just the title; Dr. Harper barely gets through a sentence without swearing. It’s a lot, even by this (European) reviewer’s standards (we’re a lot more relaxed about swearing over here, than people tend to be in America).
On the other hand, something that Dr. Harper excels at is actually explaining stuff very well. So while it sometimes seems like she’s “trying too hard” style-wise in terms of being “not like other therapists”, in her defence she’s nevertheless a very good writer; she knows her stuff, and knows how to communicate it clearly.
Bottom line: if you don’t mind a writer who swears more than 99% of soldiers, then this book is an excellent how-to guide for self-administered trauma-informed care.
Click here to check out Unfuck Your Brain, and indeed unfuck it!
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