An unbroken night’s sleep is a myth. Here’s what good sleep looks like
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What do you imagine a good night’s sleep to be?
Often when people come into our sleep clinic seeking treatment, they share ideas about healthy sleep.
Many think when their head hits the pillow, they should fall into a deep and restorative sleep, and emerge after about eight hours feeling refreshed. They’re in good company – many Australians hold the same belief.
In reality, healthy sleep is cyclic across the night, as you move in and out of the different stages of sleep, often waking up several times. Some people remember one or more of these awakenings, others do not. Let’s consider what a healthy night’s sleep looks like.
Sleep cycles are a roller-coaster
As an adult, our sleep moves through different cycles and brief awakenings during the night. Sleep cycles last roughly 90 minutes each.
We typically start the night with lighter sleep, before moving into deeper sleep stages, and rising again into rapid eye movement (REM) sleep – the stage of sleep often linked to vivid dreaming.
If sleeping well, we get most of our deep sleep in the first half of the night, with REM sleep more common in the second half of the night.
Adults usually move through five or six sleep cycles in a night, and it is entirely normal to wake up briefly at the end of each one. That means we might be waking up five times during the night. This can increase with older age and still be healthy. If you’re not remembering these awakenings that’s OK – they can be quite brief.
What does getting a ‘good’ sleep actually mean?
You’ll often hear that adults need between seven and nine hours of sleep per night. But good sleep is about more than the number of hours – it’s also about the quality.
For most people, sleeping well means being able to fall asleep soon after getting into bed (within around 30 minutes), sleeping without waking up for long periods, and waking feeling rested and ready for the day.
You shouldn’t be feeling excessively sleepy during the day, especially if you’re regularly getting at least seven hours of refreshing sleep a night (this is a rough rule of thumb).
But are you noticing you’re feeling physically tired, needing to nap regularly and still not feeling refreshed? It may be worthwhile touching base with your general practitioner, as there a range of possible reasons.
Common issues
Sleep disorders are common. Up to 25% of adults have insomnia, a sleep disorder where it may be hard to fall or stay asleep, or you may wake earlier in the morning than you’d like.
Rates of common sleep disorders such as insomnia and sleep apnoea – where your breathing can partially or completely stop many times during the night – also increase with age, affecting 20% of early adults and 40% of people in middle age. There are effective treatments, so asking for help is important.
Beyond sleep disorders, our sleep can also be disrupted by chronic health conditions – such as pain – and by certain medications.
There can also be other reasons we’re not sleeping well. Some of us are woken by children, pets or traffic noise during the night. These “forced awakenings” mean we may find it harder to get up in the morning, take longer to leave bed and feel less satisfied with our sleep. For some people, night awakenings may have no clear cause.
A good way to tell if these awakenings are a problem for you is by thinking about how they affect you. When they cause feelings of frustration or worry, or are impacting how we feel and function during the day, it might be a sign to seek some help.
We also may struggle to get up in the morning. This could be for a range of reasons, including not sleeping long enough, going to bed or waking up at irregular times – or even your own internal clock, which can influence the time your body prefers to sleep.
If you’re regularly struggling to get up for work or family needs, it can be an indication you may need to seek help. Some of these factors can be explored with a sleep psychologist if they are causing concern.
Can my smart watch help?
It is important to remember sleep-tracking devices can vary in accuracy for looking at the different sleep stages. While they can give a rough estimate, they are not a perfect measure.
In-laboratory polysomnography, or PSG, is the best standard measure to examine your sleep stages. A PSG examines breathing, oxygen saturation, brain waves and heart rate during sleep.
Rather than closely examining nightly data (including sleep stages) from a sleep tracker, it may be more helpful to look at the patterns of your sleep (bed and wake times) over time.
Understanding your sleep patterns may help identify and adjust behaviours that negatively impact your sleep, such as your bedtime routine and sleeping environment.
And if you find viewing your sleep data is making you feel worried about your sleep, this may not be useful for you. Most importantly, if you are concerned it is important to discuss it with your GP who can refer you to the appropriate specialist sleep health provider.
Amy Reynolds, Associate Professor in Clinical Sleep Health, Flinders University; Claire Dunbar, Research Associate, Sleep Health, Flinders University; Gorica Micic, Postdoctoral Research Fellow, Clinical Psychologist, Flinders University; Hannah Scott, Research Fellow in Sleep Health, Flinders University, and Nicole Lovato, Associate Professor, Adelaide Institute for Sleep Health, Flinders University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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How To Reduce Your Alzheimer’s Risk
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Reduce Your Alzheimer’s Risk
Alzheimer’s is just one cause of dementia, but it’s a very notable one, not least of all because it’s
- a) the most common cause of dementia, and
- b) a measurably terminal disease.
For that reason we’re focusing on Alzheimer’s today, although most of the advice will go for avoiding dementia in general.
First, some things not everyone knows about Alzheimer’s:
- Alzheimer’s is a terminal disease.
- People who get a diagnosis at age 60 are typically given 4–8 years to live.
- Some soldier on for as many as 20, but those are rare outliers.
- Alzheimer’s begins 20 years or more before other symptoms start to develop.
- This makes this information very relevant for younger people approaching 40, for example.
- Alzheimer’s accounts for 60–80% of dementia, and affects around 6% of people over 60.
- By the age of 65, that figure is 10%. By the age of 70, however, the percentage is still about the same—this is because of the mortality rate preventing the accumulation of Alzheimer’s patients over time.
Want to know more? Read: 2023 Alzheimer’s Disease Facts And Figures Special Report ← this is a very comprehensive downloadablereference, by the way, including a lot of information about diagnosis, treatmentpathways, and earlyinterventions.
Speaking of diagnosis…
Know what the symptoms are… and aren’t!
Forgetting your car keys can be frustrating. Forgetting them frequently can be worrying.
But: there’s a difference between forgetting your car keys, and forgetting what car keys are used for. The latter is the kind of memory loss that’s more of a red flag for Alzheimer’s.
Similarly: forgetting someone’s name can be embarrassing. Forgetting someone’s name, asking them, forgetting asking them, asking them again, forgetting again (lather rinse repeat) is more of a red flag for Alzheimer’s.
There are other symptoms too, some of them less commonly known:
❝Difficulty remembering recent conversations, names or events; apathy; and depression are often early symptoms. Communication problems, confusion, poor judgment and behavioral changes may occur next. Difficulty walking, speaking, and swallowing are common in the late stages of the disease❞
If you or a loved one are experiencing worrying symptoms: when it comes to diagnosis and intervention, sooner is a lot better than later, so do talk to your doctor.
As for reducing your risk? First, the obvious stuff:
The usual 5 things that go for almost everything:
- Have a good diet—the Mediterranean Diet is once again recommended (we expect this will not be a surprise to regular readers!)
- Get regular exercise—in the case of avoiding Alzheimer’s and other dementias, typically the most important thing here is heart health, so getting regular cardiovascular exercise, such walking, running, or dancing is great. Cycling too. Swimming, not so much. Not that swimming’s bad or anything, it’s just that when your body is horizontal, the heart has less work to do, especially in the upper part of the body, because it’s not defying gravity. Similarly, yoga is great for the health but won’t particularly help with this, nor will weight training.
- Get good sleep—as we get older, we tend to need less sleep, and tend more towards the lower end of the standard “7–9 hours” prescription, but getting at least those 7 hours makes a huge difference.
- Cut down (or eliminate) alcohol consumption—and especially avoid binge-drinking. While “binge-drinking” is typically associated with young people, that Christmas party where that one uncle gets very drunk is also binge-drinking, for example. Plus, heavy drinking in early life has also been correlated with higher risk of Alzheimer’s later.
- Don’t smoke. It’s bad for everything, and Alzheimer’s risk is no exception.
How much do lifestyle changes alone make a difference?
They make a big difference. This 2022 population-based cohort study (so: huge sample size) looked at people who had 4–5 of the healthy lifestyle factors being studied, vs people who had 0–1 of them. They found:
❝A healthy lifestyle was associated with a longer life expectancy among men and women, and they lived a larger proportion of their remaining years without Alzheimer’s dementia.❞
The numbers of years involved by the way ranged between 3 and 20 years, in terms of life expectancy and years without or with Alzheimer’s, with the average increase of healthy life years being approximately the same as the average increase in years. This is important, because:
A lot of people think “well if I’m going to go senile, I might as well [unhealthy choice that shortens lifespan]”, but they misunderstand a critical factor:
The unhealthy choices will reduce their healthy life years, and simply bring the unhealthy ones (and subsequent death) sooner. If you’re going to spend your last few years in ill-health, it’s better to do so at 90 than 50.
The other thing you may already know… And a thing about it that not everyone considers:
Keeping cognitively active is important. This much is broadly known by the general public, and to clinicians, this was the fourth “healthy factor” in the list of five (instead of the sleep that we put there, because we were listing the 5 things that go for most preventable health issues).
Everyone leaps to mention sudoku at this point, so if that’s your thing, great, enjoy it! (This writer personally enjoys chess, which isn’t everyone’s cup of tea; if it yours though, you can come join her on Chess.com and we’ll keep sharp together)
But the more parts of your mental faculties you keep active, the better. Remember, brainpower (as with many things in health and life) is a matter of “use it or lose it” and this is on a “per skill” basis!
What this means: doing sudoku (a number-based puzzle game) or chess (great as it may be) won’t help as much for keeping your language skills intact, for example. Given that language skills are one of the most impactful and key faculties to get lost to Alzheimer’s disease, neglecting such would be quite an oversight!
Some good ways to keep your language skills tip-top:
- Read—but read something challenging, if possible. It doesn’t have to be Thomas Scanlon’s What We Owe To Each Other, but it should be more challenging than a tabloid, for example. In fact, on the topic of examples:
- This newsletter is written to be easy to read, while not shying away from complex ideas or hard science. Our mission is literally to “make [well-sourced, science-based] health and productivity crazy simple”.
- But the academic papers that we link? Those aren’t written to be easy to read. Go read them, or at least the abstracts (in academia, an abstract is essentially an up-front summary, and is usually the first thing you’ll see when you click a link to a study or such). Challenge yourself!
- Write—compared to reading/listening, producing language is a (related, but) somewhat separate skill. Just ask any foreign language learner which is more challenging: reading or writing!
- Journaling is great, but writing for others is better (as then you’ll be forced to think more about it)
- Learn a foreign language—in this case, what matters it that you’re practicing and learning, so in the scale of easy to hard, or doesn’t matter if it’s Esperanto or Arabic. Duolingo is a great free resource that we recommend for this, and they have a wide range of extensive courses these days.
Now for the least obvious things…
Social contact is important.
Especially in older age, it’s easy to find oneself with fewer remaining friends and family, and getting out and about can be harder for everyone. Whatever our personal inclinations (some people being more introverted or less social than others), we are fundamentally a social species, and hundreds of thousands of years of evolution have built us around the idea that we will live our lives alongside others of our kind. And when we don’t, we don’t do as well.
See for example: Associations of Social Isolation and Loneliness With Later Dementia
If you can’t get out and about easily:
- Online socialising is still socializing.
- Online community is still community.
- Online conversations between friends are still conversations between friends.
If you don’t have much (or anyone) in the category of friends and family, join Facebook groups related to your interests, for example.
Berries are surprisingly good
^This may read like a headline from 200,000 BCE, but it’s relevant here!
Particularly recommended are:
- blueberries
- blackberries
- raspberries
- strawberries
- cranberries
We know that many of these berries seem to have a shelf-life of something like 30 minutes from time of purchase, but… Frozen and dried are perfectly good nutritionally, and in many cases, even better nutritionally than fresh.
Read: Effect of berry-based supplements and foods on cognitive function: a systematic review
Turmeric’s health benefits appear to include protecting against Alzheimer’s
Again, this is about risk reduction, and turmeric (also called curcumin, which is not the same as cumin) significantly reduces the build-up of amyloid plaques in the brain. Amyloid plaques are part of the progression of Alzheimer’s.
See for yourself: Protective Effects of Indian Spice Curcumin Against Amyloid Beta in Alzheimer’s Disease
If you don’t like it as a spice (and even if you do, you probably don’t want to put it in your food every day), you can easily get it as a supplement in capsule form.
Lower your homocysteine levels
Lower our what now? Homocysteine is an amino acid used for making certain proteins, and it’s a risk factor for Alzheimer’s.
Foods high in folate (and possible other B-vitamins) seem to lower homocysteine levels. Top choices include:
- Leafy greens
- Cruciferous vegetables
- Tomatoes
Get plenty of lutein
We did a main feature about specifically this a little while ago, so we’ll not repeat our work here, but lutein is found in, well, the same things we just listed above, and lower levels of lutein are associated with Alzheimer’s disease. It’s not a proven causative factor—we don’t know entirely what causes Alzheimer’s, just a lot of factors that have a high enough correlation that it’d be remiss to ignore them.
Catch up on our previous article: Brain Food? The Eyes Have It
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Calisthenics for Beginners – by Matt Schifferle
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For those who are curious to take up calisthenics, for its famed benefit to many kinds of health, this is a great starter-book.
First, what kind of benefits can we expect? Lots, but most critically:
- Greater mobility (as a wide range of movements is practiced, some of them stretchy)
- Cardiovascular fitness (calisthenics can be performed as a form of High Intensity Impact Training, HIIT)
- Improved muscle-tone (because these are bodyweight strength-training exercises—have you seen a gymnast’s body?)
- Denser bones (strong muscles can’t be built on weak bones, so the body compensates by strengthening them)
A lot of the other benefits stem from those, ranging from reduced risk of stroke, diabetes, heart disease, osteoporosis, etc, to improved mood, more energy, better sleep, and generally all things that come with a decent, rounded, exercise regime.
Schifferle explains not just the exercises, but also the principles, so that we understand what we’re doing and why. Understanding improves motivation, adherence, and—often—form. Exercise diagrams are clear, and have active muscle-groups highlighted and color-coded for extra clarity.
As well as explaining exercises individually, he includes three programs, increasing in intensity. He also offers adjustments to make exercises easier or more challenging, depending on the current condition of your body.
The book’s not without its limitations—it may be a little male-centric for some readers, for instance—but all in all, it’s a very strong introduction to calisthenics… Enough to get anyone up and running, so to speak!
Get started with “Calisthenics for Beginners” from Amazon today!
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How does the drug abemaciclib treat breast cancer?
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The anti-cancer drug abemaciclib (also known as Vernezio) has this month been added to the Australian Pharmaceutical Benefits Scheme (PBS) to treat certain types of breast cancer.
This significantly reduces the cost of the drug. A patient can now expect to pay A$31.60 for a 28-day supply ($7.70 with a health care concession card). The price of abemaciclib without government subsidy is $4,250.
So what is abemaciclib, and how did we get to this point?
It stops cells dividing
Researchers at the pharmaceutical company Eli Lilly developed abemaciclib and published the first study on the drug (then known as LY2835219) in 2014.
Abemaciclib is a type of drug known as a “cyclin-dependent kinase inhibitor”. It’s taken as a pill twice a day.
To maintain our health, many of the cells in our bodies need to grow and divide to produce new cells. Cancers develop when cells grow and divide out of control. Therefore, stopping cells from dividing into new cells is one way that cancer can be fought.
When cells divide, they have to make a copy of their DNA to pass onto the new cell. “Cyclin-dependent kinases” (CDKs for short) are essential for this process. So, if you stop the CDKs, you stop the DNA copying, you stop cells dividing, and you fight the cancer.
However, there are different types of CDKs, and not all cancers need them all to grow. Abemaciclib specifically targets CDK4 and CDK6. Thankfully, a lot of cancers do need these CDKs, including some breast cancers.
The drug targets CDK4 and CDK6. Photoroyalty/Shutterstock But abemaciclib will only be effective against cancers that rely on CDK4 and CDK6 for continued growth. This specificity also means abemaciclib is fairly unique, so it can’t easily be replaced with a different drug.
Two other CDK4/6 inhibitors were developed around the same time as abemaciclib, and are called ribociclib and palbociclib. Both of these drugs are also on the PBS for specific types of breast cancer. As the drugs differ in their chemical structures, they have slight differences in the way they are taken up and processed by the body. The preferred drug given to a breast cancer patient will depend on their unique circumstances.
What are the side effects?
Research is still ongoing into the differences between each of these CDK4/6 inhibitors, but it is known that the side effects are largely similar, but can differ in severity.
The most common side effects of abemaciclib are fatigue, diarrhoea and neutropenia (reduced white blood cells). The gastrointestinal issues are generally more severe with abemaciclib.
If these side effects are too severe, abemaciclib treatment can be stopped.
What types of cancer has abemaciclib been approved for?
In 2017, the United States Food and Drug Administration (FDA) approved abemaciclib for the treatment of patients with metastatic HR+/HER2- (hormone receptor-positive and human epidermal growth factor receptor 2-negative) breast cancer who did not respond to standard endocrine therapy.
Australia’s Therapeutic Goods Administration (TGA) similarly approved abemaciclib in 2022 as an “adjuvant” therapy (after the initial surgery to remove the tumour) for patients with HR+/HER2- invasive early breast cancer which had spread to lymph nodes and was at high risk of returning.
The drug is approved for people with early breast cancer which is at high risk of returning. PeopleImages.com – Yuri A/Shutterstock As of May 1 2024, the PBS covers this use of abemaciclib in combination with endocrine therapy such as fulvestrant, which is also listed on the PBS. Endocrine therapy, also known as hormonal therapy, blocks hormone receptor positive (HR+) cancers from receiving the hormones they need to survive.
Could abemaciclib be used for other cancers in the future?
Abemaciclib is of great interest to scientists and medical practitioners, and testing is ongoing to assess the effectiveness of abemaciclib in treating a range of other cancers, including gastrointestinal cancers and blood cancers.
Abemaciclib may even be usable in brain cancers, as it has long been known to be capable of crossing the blood-brain barrier, a common stumbling block for potential anti-cancer drugs.
Time will tell whether the role of abemaciclib in health care will be expanded. But for now, its inclusion on the PBS is sure to bring some relief to breast cancer patients nationwide.
Sarah Diepstraten, Senior Research Officer, Blood Cells and Blood Cancer Division, Walter and Eliza Hall Institute and John (Eddie) La Marca, Senior Resarch Officer, Walter and Eliza Hall Institute
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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The Dark Side Of Memory (And How To Make Your Life Better)
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How To Stop Revisiting Those Memories
We’ve talked before about putting the brakes on negative thought spirals (and that’s a really useful technique, so if you weren’t with us yet for that one, we do recommend hopping back and reading it!).
We’ve also talked about optimizing memory, to include making moments unforgettable.
But what about the moments we’d rather forget?
First, a quick note: we have no pressing wish or need to re-traumatize any readers, so if you’ve a pressing reason to think your memories you’d rather forget are beyond the scope of a few hundred words “one quick trick” in a newsletter, feel free to skip this section today.
One more quick note: it is generally not considered healthy to repress important memories. Some things are best worked through consciously in therapy with a competent professional.
Today’s technique is more for things in the category of “do you really need to keep remembering that one time you did something embarrassing 20 years ago?”
That said… sometimes, even when it does come to the management of serious PTSD, therapy can (intentionally, reasonably) throw in the towel on processing all of something big, and instead seek to simply look at minimizing its effect on ongoing life. Again, that’s best undertaken with a well-trained professional, however.
For more trivial annoyances, meanwhile…
Two Steps To Forgetting
The first step:
You may remember that memories are tied to the senses, and the more senses are involved, the more easily and fully we remember a thing. To remember something, therefore, we make sure to pay full attention to all the sensory experience of the memory, bringing in all 5 senses if possible.
To forget, the reverse is true. Drain the memory of color, make it black and white, fuzzier, blurrier, smaller, further away, sterile, silent, gone.
You can make a habit of doing this automatically whenever your unwanted memory resurfaces.
The
secondmissing step:This is the second step, but it’s going to be a missing step. Memories, like paths in a forest, are easier to access the more often we access them. A memory we visit every day will have a well-worn path, easy to follow. A memory we haven’t visited for decades will have an overgrown, sometimes nearly impossible-to-find path.
To labor the metaphor a little: if your memory has literal steps leading to it, we’re going to remove one of the steps now, to make it very difficult to access accidentally. Don’t worry, you can always put the step back later if you want to.
Let’s say you want to forget something that happened once upon a time in a certain workplace. Rather than wait for the memory in question to come up, we’re going to apply the first step that we just learned, to the entire workplace.
So, in this example, you’d make the memory of that workplace drained of color, made black and white, fuzzier, blurrier, smaller, further away, sterile, silent, gone.
Then, you’d make a habit of doing that whenever that workplace nearly comes to mind.
The result? You’re unlikely to accidentally access a memory that occurred in that workplace, if even mentally wandering to the workplace itself causes it to shrivel up and disappear like paper in fire.
Important reminder
The above psychological technique is to psychological trauma what painkillers are to physical pain. It can ease the symptom, while masking the cause. If it’s something serious, we recommend enlisting the help of a professional, rather than “self-medicating” in this fashion.
If it’s just a small annoying thing, though, sometimes it’s easier to just be able to refrain from prodding and poking it daily, forget about it, and enjoy life.
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Putting a Halt to Feeling Lost, Anxious, Stressed & Unhappy
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Starting From the Middle
Today’s video (below) dives straight into the heart of the issue, examining the victim mindset, with Dr. Gabor Maté immediately, and quite vulnerably, sharing his personal experiences conquering feelings of despair and anxiety.
As one of the comments on the video says, Dr. Maté is a “person who teaches about something because they experience it themselves”. And it shows through his approach.
With raw honesty, Dr. Maté empathizes with those grappling with inner turmoil, offering hope by emphasizing the power of healing in the present moment.
What is His Method?
Explained simply, Dr. Maté urges individuals to seek trauma-informed care and therapies that address underlying wounds; he emphasizes the pitfalls of relying solely on medication, and instead highlights the idea that triggers can be seen as opportunities for self-reflection and growth. He urges individuals to approach their triggers with compassionate curiosity rather than self-judgment.
In short, Dr Maté’s empathetic approach immediately calms the viewer, whilst providing knowledge crucial to self-improvement.
Let this video act as a reminder that we should take our mental health as seriously as our general health.
How was the video? If you’ve discovered any great videos yourself that you’d like to share with fellow 10almonds readers, then please do email them to us!
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Thinking of using an activity tracker to achieve your exercise goals? Here’s where it can help – and where it probably won’t
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It’s that time of year when many people are getting started on their resolutions for the year ahead. Doing more physical activity is a popular and worthwhile goal.
If you’re hoping to be more active in 2024, perhaps you’ve invested in an activity tracker, or you’re considering buying one.
But what are the benefits of activity trackers? And will a basic tracker do the trick, or do you need a fancy one with lots of features? Let’s take a look.
Why use an activity tracker?
One of the most powerful predictors for being active is whether or not you are monitoring how active you are.
Most people have a vague idea of how active they are, but this is inaccurate a lot of the time. Once people consciously start to keep track of how much activity they do, they often realise it’s less than what they thought, and this motivates them to be more active.
You can self-monitor without an activity tracker (just by writing down what you do), but this method is hard to keep up in the long run and it’s also a lot less accurate compared to devices that track your every move 24/7.
By tracking steps or “activity minutes” you can ascertain whether or not you are meeting the physical activity guidelines (150 minutes of moderate to vigorous physical activity per week).
It also allows you to track how you’re progressing with any personal activity goals, and view your progress over time. All this would be difficult without an activity tracker.
Research has shown the most popular brands of activity trackers are generally reliable when it comes to tracking basic measures such as steps and activity minutes.
But wait, there’s more
Many activity trackers on the market nowadays track a range of other measures which their manufacturers promote as important in monitoring health and fitness. But is this really the case? Let’s look at some of these.
Resting heart rate
This is your heart rate at rest, which is normally somewhere between 60 and 100 beats per minute. Your resting heart rate will gradually go down as you become fitter, especially if you’re doing a lot of high-intensity exercise. Your risk of dying of any cause (all-cause mortality) is much lower when you have a low resting heart rate.
So, it is useful to keep an eye on your resting heart rate. Activity trackers are pretty good at tracking it, but you can also easily measure your heart rate by monitoring your pulse and using a stopwatch.
Heart rate during exercise
Activity trackers will also measure your heart rate when you’re active. To improve fitness efficiently, professional athletes focus on having their heart rate in certain “zones” when they’re exercising – so knowing their heart rate during exercise is important.
But if you just want to be more active and healthier, without a specific training goal in mind, you can exercise at a level that feels good to you and not worry about your heart rate during activity. The most important thing is that you’re being active.
Also, a dedicated heart rate monitor with a strap around your chest will do a much better job at measuring your actual heart rate compared to an activity tracker worn around your wrist.
Maximal heart rate
This is the hardest your heart could beat when you’re active, not something you could sustain very long. Your maximal heart rate is not influenced by how much exercise you do, or your fitness level.
Most activity trackers don’t measure it accurately anyway, so you might as well forget about this one.
VO₂max
Your muscles need oxygen to work. The more oxygen your body can process, the harder you can work, and therefore the fitter you are.
VO₂max is the volume (V) of oxygen (O₂) we could breathe maximally (max) over a one minute interval, expressed as millilitres of oxygen per kilogram of body weight per minute (ml/kg/min). Inactive women and men would have a VO₂max lower than 30 and 40 ml/kg/min, respectively. A reasonably good VO₂max would be mid thirties and higher for women and mid forties and higher for men.
VO₂max is another measure of fitness that correlates well with all-cause mortality: the higher it is, the lower your risk of dying.
For athletes, VO₂max is usually measured in a lab on a treadmill while wearing a mask that measures oxygen consumption. Activity trackers instead look at your running speed (using a GPS chip) and your heart rate and compare these measures to values from other people.
If you can run fast with a low heart rate your tracker will assume you are relatively fit, resulting in a higher VO₂max. These estimates are not very accurate as they are based on lots of assumptions. However, the error of the measurement is reasonably consistent. This means if your VO₂max is gradually increasing, you are likely to be getting fitter.
So what’s the take-home message? Focus on how many steps you take every day or the number of activity minutes you achieve. Even a basic activity tracker will measure these factors relatively accurately. There is no real need to track other measures and pay more for an activity tracker that records them, unless you are getting really serious about exercise.
Corneel Vandelanotte, Professorial Research Fellow: Physical Activity and Health, CQUniversity Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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