This Is When Your Muscles Are Strongest
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Dr. Karyn Esser is a professor in the Department of Physiology and Aging at the University of Florida, where she’s also the co-director of the University of Florida Older Americans Independence Center, and she has insights to share on when it’s best to exercise:
It’s 4–5pm
Surprise, no clickbait or burying the lede!
This goes regardless of age or sex, but as we get older, it’s common for our circadian rhythm to weaken, which may result in a tendency to fluctuate a bit more.
However, since it’s healthy to keep one’s circadian rhythm as stable as reasonably possible, this is a good reason to try to keep our main exercise focused around that time of day, as it provides a sort of “anchor point” for the rest of our day to attach to, so that our body can know what time it is relative to that.
It’s also the most useful time of day to exercise, because most exercises give benefits proportional to progressive overloading, so training at our peak efficiency time will give the most efficient results. So much for those 5am runs!
On which note: while the title says “strongest” and the thumbnail has dumbbells, this does go for all different types of exercises that have been tested.
For more details on all of the above, enjoy:
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Want to learn more?
You might also like to read:
The Circadian Rhythm: Far More Than Most People Know
Take care!
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Microplastics are in our brains. How worried should I be?
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Plastic is in our clothes, cars, mobile phones, water bottles and food containers. But recent research adds to growing concerns about the impact of tiny plastic fragments on our health.
A study from the United States has, for the first time, found microplastics in human brains. The study, which has yet to be independently verified by other scientists, has been described in the media as scary, shocking and alarming.
But what exactly are microplastics? What do they mean for our health? Should we be concerned?
Daniel Megias/Shutterstock What are microplastics? Can you see them?
We often consider plastic items to be indestructible. But plastic breaks down into smaller particles. Definitions vary but generally microplastics are smaller than five millimetres.
This makes some too small to be seen with the naked eye. So, many of the images the media uses to illustrate articles about microplastics are misleading, as some show much larger, clearly visible pieces.
Microplastics have been reported in many sources of drinking water and everyday food items. This means we are constantly exposed to them in our diet.
Such widespread, chronic (long-term) exposure makes this a serious concern for human health. While research investigating the potential risk microplastics pose to our health is limited, it is growing.
How about this latest study?
The study looked at concentrations of microplastics in 51 samples from men and women set aside from routine autopsies in Albuquerque, New Mexico. Samples were from the liver, kidney and brain.
These tiny particles are difficult to study due to their size, even with a high-powered microscope. So rather than trying to see them, researchers are beginning to use complex instruments that identify the chemical composition of microplastics in a sample. This is the technique used in this study.
The researchers were surprised to find up to 30 times more microplastics in brain samples than in the liver and kidney.
They hypothesised this could be due to high blood flow to the brain (carrying plastic particles with it). Alternatively, the liver and kidneys might be better suited to dealing with external toxins and particles. We also know the brain does not undergo the same amount of cellular renewal as other organs in the body, which could make the plastics linger here.
The researchers also found the amount of plastics in brain samples increased by about 50% between 2016 and 2024. This may reflect the rise in environmental plastic pollution and increased human exposure.
The microplastics found in this study were mostly composed of polyethylene. This is the most commonly produced plastic in the world and is used for many everyday products, such as bottle caps and plastic bags.
This is the first time microplastics have been found in human brains, which is important. However, this study is a “pre-print”, so other independent microplastics researchers haven’t yet reviewed or validated the study.
The most common plastic found was polyethylene, which is used to make plastic bags and bottle caps. Maciej Bledowski/Shutterstock How do microplastics end up in the brain?
Microplastics typically enter the body through contaminated food and water. This can disrupt the gut microbiome (the community of microbes in your gut) and cause inflammation. This leads to effects in the whole body via the immune system and the complex, two-way communication system between the gut and the brain. This so-called gut-brain axis is implicated in many aspects of health and disease.
We can also breathe in airborne microplastics. Once these particles are in the gut or lungs, they can move into the bloodstream and then travel around the body into various organs.
Studies have found microplastics in human faeces, joints, livers, reproductive organs, blood, vessels and hearts.
Microplastics also migrate to the brains of wild fish. In mouse studies, ingested microplastics are absorbed from the gut into the blood and can enter the brain, becoming lodged in other organs along the way.
To get into brain tissue, microplastics must cross the blood-brain-barrier, an intricate layer of cells that is supposed to keep things in the blood from entering the brain.
Although concerning, this is not surprising, as microplastics must cross similar cell barriers to enter the urine, testes and placenta, where they have already been found in humans.
Is this a health concern?
We don’t yet know the effects of microplastics in the human brain. Some laboratory experiments suggest microplastics increase brain inflammation and cell damage, alter gene expression and change brain structure.
Aside from the effects of the microplastic particles themselves, microplastics might also pose risks if they carry environmental toxins or bacteria into and around the body.
Various plastic chemicals could also leach out of the microplastics into the body. These include the famous hormone-disrupting chemicals known as BPAs.
But microplastics and their effects are difficult to study. In addition to their small size, there are so many different types of plastics in the environment. More than 13,000 different chemicals have been identified in plastic products, with more being developed every year.
Microplastics are also weathered by the environment and digestive processes, and this is hard to reproduce in the lab.
A goal of our research is to understand how these factors change the way microplastics behave in the body. We plan to investigate if improving the integrity of the gut barrier through diet or probiotics can prevent the uptake of microplastics from the gut into the bloodstream. This may effectively stop the particles from circulating around the body and lodging into organs.
How do I minimise my exposure?
Microplastics are widespread in the environment, and it’s difficult to avoid exposure. We are just beginning to understand how microplastics can affect our health.
Until we have more scientific evidence, the best thing we can do is reduce our exposure to plastics where we can and produce less plastic waste, so less ends up in the environment.
An easy place to start is to avoid foods and drinks packaged in single-use plastic or reheated in plastic containers. We can also minimise exposure to synthetic fibres in our home and clothing.
Sarah Hellewell, Senior Research Fellow, The Perron Institute for Neurological and Translational Science, and Research Fellow, Faculty of Health Sciences, Curtin University; Anastazja Gorecki, Teaching & Research Scholar, School of Health Sciences, University of Notre Dame Australia, and Charlotte Sofield, PhD Candidate, studying microplastics and gut/brain health, University of Notre Dame Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Scheduling Tips for Overrunning Tasks
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Your Questions, Our Answers!
Q: Often I schedule time for things, but the task takes longer than I think, or multiplies while I’m doing it, and then my schedule gets thrown out. Any ideas?
A: A relatable struggle! Happily, there are remedies:
- Does the task really absolutely need to be finished today? If not, just continue it in scheduled timeslots until it’s completed.
- Some tasks do indeed need to be finished today (hi, writer of a daily newsletter here!), so it can be useful to have an idea of how long things really take, in advance. While new tasks can catch us unawares, recurring or similar-to-previous tasks can be estimated based on how long they took previously. For this reason, we recommend doing a time audit every now and again, to see how you really use your time.
- A great resource that you should include in your schedule is a “spare” timeslot, ideally at least one per day. Call it a “buffer” or a “backup” or whatever (in my schedule it’s labelled “discretionary”), but the basic idea is that it’s a scheduled timeslot with nothing scheduled in it, and it works as an “overflow” catch-all.
Additionally:
- You can usually cut down the time it takes you to do tasks by setting “Deep Work” rules for yourself. For example: cut out distractions, single-task, work in for example 25-minute bursts with 5-minute breaks, etc
- You can also usually cut down the time it takes you to do tasks by making sure you’re prepared for them. Not just task-specific preparation, either! A clear head on, plenty of energy, the resources you’ll need (including refreshments!) to hand, etc can make a huge difference to efficiency.
See Also: Time Optimism and the Planning Fallacy
Do you have a question you’d like to see answered here? Hit reply or use the feedback widget at the bottom; we’d love to hear from you!
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Kettlebell Sport & Fitness Basics – by Audrey Burgio
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Professional athlete & coach Audrey Burgio covers how to get a full-body workout that will make you stronger and more flexible (there are stretches here too, and many exercises are about strength and suppleness), as well as building stability and balance. In short, more robust and with better mobility.
Which is one of the best things about kettlebell training—unlike dumbbells and barbells, a kettlebell requires the kind of strength that one has to use when doing many routine tasks, from carrying the groceries to moving a big pan in the kitchen.
Because it is otherwise absolutely possible to look like Arnold Schwarzenegger in the gym, and then still pull a muscle moving something at home because the angle was awkward or somesuch!
However, making one’s body so robust does require training safely, and the clear instructions in this book will help the reader avoid injuries that might otherwise be incurred by just picking up some kettlebells and guessing.
Bottom line: if you’d like to get strong and supple from the comfort of your own home, this book can definitely lead the way!
Click here to check out Kettlebell Sport & Fitness Basics, and see the difference in your body!
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In Praise Of Walking – by Dr. Shane O’Mara
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At 10almonds we talk often of the health benefits of walking, so what’s new here?
As the subtitle suggests: a new scientific exploration!
Dr. Shane O’Mara is a professor of experimental brain research—and a keen walker. Combining his profession and his passion, he offers us a uniquely well-grounded perspective.
While the writing style is very readable, there’s a lot of science referenced here, with many studies cited. We love that!
We begin our journey by learning what we have in common with sea squirts, and what we have different from all other apes. What we can learn from other humans, from toddlers to supercentenarians.
As one might expect from a professor of experimental brain research, we learn a lot more about what walking does for our brain, than for the rest of our body. We’ve previously talked about walking and cardiovascular health, and brown adipose tissue, and benefits to the immune system, but this book remains steadfastly focused on the brain.
Which just goes to show, what a lot there is to say for the science-based benefits to our brain health, both neurologically and psychologically!
One of the things at which Dr. O’Mara excels that this reviewer hasn’t seen someone do so well before, is neatly tie together the appropriate “why” and “how” to each “what” of the brain-benefits of walking. Not just that walking boosts mood or creativity or problem-solving, say, but why and how it does so.
Often, understanding that can be the difference between being motivated to actually do it or not!
Bottom line: if there’s a book that’ll get you lacing up your walking shoes, this’ll be the one.
Click here to check out “In Praise of Walking” on Amazon, and start reaping the benefits!
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The voice in your head may help you recall and process words. But what if you don’t have one?
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Can you imagine hearing yourself speak? A voice inside your head – perhaps reciting a shopping list or a phone number? What would life be like if you couldn’t?
Some people, including me, cannot have imagined visual experiences. We cannot close our eyes and conjure an experience of seeing a loved one’s face, or imagine our lounge room layout – to consider if a new piece of furniture might fit in it. This is called “aphantasia”, from a Greek phrase where the “a” means without, and “phantasia” refers to an image. Colloquially, people like myself are often referred to as having a “blind mind”.
While most attention has been given to the inability to have imagined visual sensations, aphantasics can lack other imagined experiences. We might be unable to experience imagined tastes or smells. Some people cannot imagine hearing themselves speak.
A recent study has advanced our understanding of people who cannot imagine hearing their own internal monologue. Importantly, the authors have identified some tasks that such people are more likely to find challenging.
fizkes/Shutterstock What the study found
Researchers at the University of Copenhagen in Denmark and at the University of Wisconsin-Madison in the United States recruited 93 volunteers. They included 46 adults who reported low levels of inner speech and 47 who reported high levels.
Both groups were given challenging tasks: judging if the names of objects they had seen would rhyme and recalling words. The group without an inner monologue performed worse. But differences disappeared when everyone could say words aloud.
Importantly, people who reported less inner speech were not worse at all tasks. They could recall similar numbers of words when the words had a different appearance to one another. This negates any suggestion that aphants (people with aphantasia) simply weren’t trying or were less capable.
Hearing our own imagined voice may play an important role in word processing. sutadimages/Shutterstock A welcome validation
The study provides some welcome evidence for the lived experiences of some aphants, who are still often told their experiences are not different, but rather that they cannot describe their imagined experiences. Some people feel anxiety when they realise other people can have imagined experiences that they cannot. These feelings may be deepened when others assert they are merely confused or inarticulate.
In my own aphantasia research I have often quizzed crowds of people on their capacity to have imagined experiences.
Questions about the capacity to have imagined visual or audio sensations tend to be excitedly endorsed by a vast majority, but questions about imagined experiences of taste or smell seem to cause more confusion. Some people are adamant they can do this, including a colleague who says he can imagine what combinations of ingredients will taste like when cooked together. But other responses suggest subtypes of aphantasia may prove to be more common than we realise.
The authors of the recent study suggest the inability to imagine hearing yourself speak should be referred to as “anendophasia”, meaning without inner speech. Other authors had suggested anauralia (meaning without auditory imagery). Still other researchers have referred to all types of imagined sensation as being different types of “imagery”.
Having consistent names is important. It can help scientists “talk” to one another to compare findings. If different authors use different names, important evidence can be missed.
We’re starting to broaden our understanding of the senses and how we imagine them. Napat Chaichanasiri/Shutterstock We have more than 5 senses
Debate continues about how many senses humans have, but some scientists reasonably argue for a number greater than 20.
In addition to the five senses of sight, smell, taste, touch and hearing, lesser known senses include thermoception (our sense of heat) and proprioception (awareness of the positions of our body parts). Thanks to proprioception, most of us can close our eyes and touch the tip of our index finger to our nose. Thanks to our vestibular sense, we typically have a good idea of which way is up and can maintain balance.
It may be tempting to give a new name to each inability to have a given type of imagined sensation. But this could lead to confusion. Another approach would be to adapt phrases that are already widely used. People who are unable to have imagined sensations commonly refer to ourselves as “aphants”. This could be adapted with a prefix, such as “audio aphant”. Time will tell which approach is adopted by most researchers.
Why we should keep investigating
Regardless of the names we use, the study of multiple types of inability to have an imagined sensation is important. These investigations could reveal the essential processes in human brains that bring about a conscious experience of an imagined sensation.
In time, this will not only lead to a better understanding of the diversity of humans, but may help uncover how human brains can create any conscious sensation. This question – how and where our conscious feelings are generated – remains one of the great mysteries of science.
Derek Arnold, Professor, School of Psychology, The University of Queensland
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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How White Is Your Tongue?
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It’s Q&A Day at 10almonds!
Have a question or a request? We love to hear from you!
In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!
As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!
So, no question/request too big or small
❝So its normal to develop a white sort of coating on the tongue, right? It develops when I eat, and is able to (somewhat) easily be brushed off❞
If (and only if) there is no soreness and the coverage of the whiteness is not extreme, then, yes, that is normal and fine.
Your mouth has a microbiome, and it’s supposed to have one (helps keep the conditions in your mouth correct, so that food is broken down and/but your gums and teeth aren’t).
Read more: The oral microbiome: Role of key organisms and complex networks in oral health and disease
The whiteness you often see on a healthy tongue is, for the most part, bacteria and dead cells—harmless.
Cleaning the whiteness off with your brush is fine. You can also scrape off with floss is similar if you prefer. Or a tongue-scraper! Those can be especially good for people for whom brushing the tongue is an unpleasant sensation. Or you can just leave it, if it doesn’t bother you.
By the way, that microbiome is a reason it can be good to go easy on the mouthwash. Moderate use of mouthwash is usually fine, but you don’t want to wipe out your microbiome then have it taken over by unpleasantries that the mouthwash didn’t kill (unpleasantries like C. albicans).
There are other mouthwash-related considerations too:
Toothpastes and mouthwashes: which kinds help, and which kinds harm?
If you start to get soreness, that probably means the papillae (little villi-like things) are inflamed. If there is soreness, and/or the whiteness is extreme, then it could be a fungal infection (usually C. albicans, also called Thrush), in which case, antifungal medications will be needed, which you can probably get over the counter from your pharmacist.
Do not try to self-treat with antibiotics.
Antibiotics will make a fungal infection worse (indeed, antibiotic usage is often the reason for getting fungal growth in the first place) by wiping out the bacteria that normally keep it in check.
Other risk factors include a sugary diet, smoking, and medications that have “dry mouth” as a side effect.
Read more: Can oral thrush be prevented?
If you have any symptoms more exciting than the above, then definitely see a doctor.
Take care!
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