How To Improve Your Heart Rate Variability
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How’s your heart rate variability?
The hallmarks of a good, strong cardiovascular system include a medium-to-low resting heart rate (for adults: under 60 beats per minute is good; under 50 is typical of athletes), and healthy blood pressure (for adults: under 120/80, while still above 90/60, is generally considered good).
Less talked-about is heart rate variability, but it’s important too…
What is heart rate variability?
Heart rate variability is a measure of how quickly and easily your heart responds to changes in demands placed upon it. For example:
- If you’re at rest and then start running your fastest (be it for leisure or survival or anything in between), your heart rate should be able to jump from its resting rate to about 180% of that as quickly as possible
- When you stop, your heart rate should be able to shift gears back to your resting rate as quickly as possible
The same goes, to a commensurately lesser extent, to changes in activity between low and moderate, or between moderate and high.
- When your heart can change gears quickly, that’s called a high heart rate variability
- When your heart is sluggish to get going and then takes a while to return to normal after exertion, that’s called a low heart rate variability.
The rate of change (i.e., the variability) is measured in microseconds per beat, and the actual numbers will vary depending on a lot of factors, but for everyone, higher is better than lower.
Aside from quick response to crises, why does it matter?
If heart rate variability is low, it means the sympathetic nervous system is dominating the parasympathetic nervous system, which means, in lay terms, your fight-or-flight response is overriding your ability to relax.
See for example: Stress and Heart Rate Variability: A Meta-Analysis and Review of the Literature
This has a lot of knock-on effects for both physical and mental health! Your heart and brain will take the worst of this damage, so it’s good to improve things for them impossible.
This Saturday’s Life Hacks: how to improve your HRV!
Firstly, the Usual Five Things™:
- A good diet (that avoids processed foods)
- Good exercise (that includes daily physical activity—more often is more important than more intense!)
- Good sleep (7–9 hours of good quality sleep per night)
- Reduce or eliminate alcohol consumption (this is dose-dependent; any reduction is an improvement)
- Don’t smoke (just don’t)
Additional regular habits that help a lot:
- Breathing exercises, mindfulness, meditation
- Therapy, especially CBT and DBT
- Stress-avoidance strategies, for example:
- Get (and maintain) your finances in good order
- Get (and maintain) your relationship(s) in good order
- Get (and maintain) your working* life in good order
*Whatever this means to you. If you’re perhaps retired, or otherwise a home-maker, or even a student, the things you “need to do” on a daily basis are your working life, for these purposes.
In terms of simple, quick-fix, physical tweaks to focus on if you’re already broadly leading a good life, two great ones are:
- Exercise: get moving! Walk to the store even if you buy nothing but a snack or drink to enjoy while walking back. If you drove, make more trips with the shopping bags rather than fewer. If you like to watch TV, consider an exercise bike or treadmill to use while watching. If you have a partner, double-up and make it a thing you do together! Take the stairs instead of the elevator. Take the scenic route when walking someplace. Go to the bathroom that’s further away. Every little helps!
- Breathe: even just a couple of times a day, practice mindful breathing. Start with even just a minute a day, to get the habit going. What breathing exercise you do isn’t so important as that you do it. Notice your breathing; count how long each breath takes. Don’t worry about “doing it right”—you’re doing great, just observe, just notice, just slowly count. We promise that regular practice of this will have you feeling amazing
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The Great Cholesterol Myth, Revised and Expanded – by Dr. Jonny Bowden and Dr. Stephen Sinatra
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The topic of cholesterol, and saturated fat for that matter, is a complex and often controversial one. How does this book treat it?
With strong opinions, is how—but backed by good science. The authors, a nutritionist and a cardiologist, pull no punches about outdated and/or cherry-picked science, and instead make the case for looking at what, statistically speaking, appear to be the real strongest risk factors.
So, are they advocating for Dave Asprey-style butter-guzzling, or “the carnivore diet”? No, no they are not. Those things remain unhealthy, even if they give some short-term gains (of energy levels, weight loss, etc).
They do advocate, however, for enjoying saturated fats in moderation, and instead of certain polyunsaturated seed oils that do far worse. They also advocate strongly for avoiding sugar, stress, and (for different reasons) statins (in most people’s cases).
They also demystify in clear terms, and often with diagrams and infographics, the various kinds of fats and their components, broken down in far more detail than any other pop-science source this reviewer has seen.
Bottom line: if you want to take a scientific approach to heart health, this book can help you to focus on what will actually make the biggest difference.
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Mocktails – by Moira Clark
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We’ve reviewed books about quitting alcohol before (such as this one), but today’s is not about quitting, so much as about enjoying non-alcoholic drinks; it’s simply a recipe book of zero-alcohol cocktails, or “mocktails”.
What sets this book apart from many of its kind is that every recipe uses only natural and fresh ingredients, rather than finding in the ingredients list some pre-made store-bought component. Instead, because of its “everything from scratch” approach, this means:
- Everything is reliably as healthy as the ingredients you use
- Every recipe’s ingredients can be found easily unless you live in a food desert
Each well-photographed and well-written recipe also comes with a QR code to see a step-by-step video tutorial (or if you get the ebook version, then a direct link as well).
Bottom line: this is the perfect mocktail book to have in (and practice with!) before the summer heat sets in.
Click here to check out Mocktails: A Delicious Collection of Non-Alcoholic Drinks, and get mixing!
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One Cause; Countless Aches
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What Is The Cause?
Zac Cupples’ video (below) makes an appealing claim: 90% of movement issues and discomforts we experience daily come from one source: reduced joint space due to increased muscle tension.
For Cupples, this could be causing anything from knee pain to foot pain to ankle pain to hip pain to generalized joint pain to…pretty much any sort of pain.
So, why do we describe this as “appealing”?
Well, if there’s just one cause, that means there is only one thing to fix
Can This Be True?
Whilst we normally stray away from oversimplifications, we found Cupples’ example quite powerful.
Cupples defends his thesis by illustrating it with a simple wrist movement experiment: try moving your wrist in a circle with your palm open, and then do the same with your fist clenched.
Did you notice a difference?
When you clench your fist, movement (normally) becomes restricted and uncomfortable, illustrating how increased tension limits joint space.
It’s a powerful analogy for understanding our body’s mechanics.
So How Do We Fix It?
To combat issues with reduced joint space, Cupples proposes a three-step solution: reducing muscle tension, increasing range of motion in commonly limited areas, and enhancing movement efficiency. He delves into strategies for achieving these, including adopting certain positions and breathing techniques.
There are also some elements of strategic muscle engagement, but we’ll leave that to him to describe:
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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How To Keep Your Mind From Wandering
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Whether your mind keeps wandering more as you get older, or you’re a young student whose super-active brain is more suited to TikTok than your assigned reading, sustained singular focus can be a challenge for everyone—and yet (alas!) it remains a required skill for so much in life.
Today’s edition of 10Almonds presents a nifty trick to get yourself through those tasks! We’ll also be taking some time to reply to your questions and comments, in our weekly interactive Q&A.
First of all though, we’ve a promise to make good on, so…
How To Stay On The Ball (Or The Tomato?) The Easy Way
For most of us, we face three main problems when it comes to tackling our to-dos:
- Where to start?
- The task seems intimidating in its size
- We get distracted and/or run out of energy
If you’re really not sure where to start, we recommended a powerful tool in last Friday’s newsletter!
For the rest, we love the Pomodoro Technique:
- Set a timer for 25 minutes, and begin your task.
- Keep going until the timer is done! No other tasks, just focus.
- Take a 5-minute break.
- Repeat
This approach has three clear benefits:
- No matter the size of the task, you are only committing to 25 minutes—everything is much less overwhelming when there’s an end in sight!
- Being only 25 minutes means we are much more likely to stay on track; it’s easier to defer other activities if we know that there will be a 5-minute break for that soon.
- Even without other tasks to distract us, it can be difficult to sustain attention for long periods; making it only 25 minutes at a time allows us to approach it with a (relatively!) fresh mind.
Have you heard that a human brain can sustain attention for only about 40 minutes before focus starts to decline rapidly?
While that’s been a popular rationale for school classroom lesson durations (and perhaps coincidentally ties in with Zoom’s 40-minute limit for free meetings), the truth is that focus starts dropping immediately, to the point that one-minute attention tests are considered sufficient to measure the ability to focus.
So a 25-minute Pomodoro is a more than fair compromise!
Why’s it called the “Pomodoro” technique?
And why is the 25-minute timed work period called a Pomodoro?
It’s because back in the 80s, university student Francesco Cirillo was struggling to focus and made a deal with himself to focus just for a short burst at a time—and he used a (now “retro” style) kitchen timer in the shape of a tomato, or “pomodoro”, in Italian.
If you don’t have a penchant for kitsch kitchenware, you can use this free, simple Online Pomodoro Timer!
(no registration/login/download necessary; it’s all right there on the web page)
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Sweet Cinnamon vs Regular Cinnamon – Which is Healthier?
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Our Verdict
When comparing sweet cinnamon to regular cinnamon, we picked the sweet.
Why?
In this case, it’s not close. One of them is health-giving and the other is poisonous (but still widely sold in supermarkets, especially in the US and Canada, because it is cheaper).
It’s worth noting that “regular cinnamon” is a bit of a misnomer, since sweet cinnamon is also called “true cinnamon”. The other cinnamon’s name is formally “cassia cinnamon”, but marketers don’t tend to call it that, preferring to calling it simply “cinnamon” and hope consumers won’t ask questions about what kind, because it’s cheaper.
Note: this too is especially true in the US and Canada, where for whatever reason sweet cinnamon seems to be more difficult to obtain than in the rest of the world.
In short, both cinnamons contain cinnamaldehyde and coumarin, but:
- Sweet/True cinnamon contains only trace amounts of coumarin
- Regular/Cassia cinnamon contains about 250x more coumarin
Coumarin is heptatotoxic, meaning it poisons the liver, and the recommended safe amount is 0.1mg/kg, so it’s easy to go over that with just a couple of teaspoons of cassia cinnamon.
You might be wondering: how can they get away with selling something that poisons the liver? In which case, see also: the alcohol aisle. Selling toxic things is very common; it just gets normalized a lot.
Cinnamaldehyde is responsible for cinnamon’s healthier properties, and is found in reasonable amounts in both cinnamons. There is about 50% more of it in the regular/cassia than in the sweet/true, but that doesn’t come close to offsetting the potential harm of its higher coumarin content.
Want to learn more?
You may like to read:
- A Tale Of Two Cinnamons ← this one has more of the science of coumarin toxicity, as well as discussing (and evidencing) cinnamaldehyde’s many healthful properties against inflammation, cancer, heart disease, neurodegeneration, etc
Enjoy!
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International Day of Women and Girls in Science
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Today is the International Day of Women and Girls in Science, so we’ve got a bunch of content for the ladies out there. Let’s start with the statement Sima Bahous (the Executive Director of UN Women) made:
❝This year, the sixty-seventh session of the Commission on the Status of Women (CSW67) will consider as its priority theme “Innovation and technological change, and education in the digital age for achieving gender equality and the empowerment of all women and girls”.
This is an unprecedented opportunity for the Commission to develop a definitive agenda for progress towards women’s full and equal participation and representation in STEM. Its implementation will require bold, coordinated, multi-stakeholder action.❞
Here at 10almonds, we are just one newsletter, and maybe we can’t change the world (…yet), but we’re all for this!
We’re certainly all in favour of education in the digital age, and more of our subscribers are women and girls than not (highest of fives from your writer today, also a woman—and I do bring most of the sciency content).
Medical News Today asks “Why Are Women Less Likely To Survive Cardiac Arrest Than Men?”
You can read the full article here, but the short version is:
- People (bystanders and EMS professionals alike!) are less likely to intervene to give CPR when the patient is a woman (we appreciate that “your hands on an unknown woman’s chest” is a social taboo, but there’s a time and a place!)
- People trained to give CPR (volunteers or professionals!) are often less confident about how to do so with female anatomy—training is almost entirely on “male” dummies.
A quick take-away from this is: to give effective CPR, you need to be giving two-inch compressions!
On a side note, do you want to learn how to correctly do chest compressions on female anatomy? This short (1:55) video could save a woman’s life!
As a science-based health and productivity newsletter, we make no apologies if occasional issues sometimes have a slant to women’s health! Heaven help us, the bias in science at large is certainly the opposite:
The list of examples is far too long for us to include here, but two that spring immediately to mind are:
- PCOS (Polycystic ovary syndrome), which affects nearly 1 in 5 women, can lead to infertility, never mind the inconvenience of irregular bleeding, chronic pain, and diabetes (amongst other things), and… nobody knows what causes it, or what to do about it.
- Endometriosis (the lining of the womb starts growing in other places), meanwhile, affects around 1 in 10 women. It causes chronic pain and fatigue, and again, nobody knows what causes it or how to cure it.
Maybe if women in STEM weren’t on the receiving end of rampant systemic misogyny, we’d have more women in science, and some answers by now!
❗️NOT-SO-FUN FACT:
Women make up only 28% of the workforce in science, technology, engineering and math (STEM), and men vastly outnumber women majoring in most STEM fields in college. The gender gaps are particularly high in some of the fastest-growing and highest-paid jobs of the future, like computer science and engineering.
Source: AAUW
The US census suggests change is happening, but is a very long way from equality!
WHAT OUR SUBSCRIBERS SAY:
❝Women are slowly gaining more of a place in academia, and slowly making more of a difference when they get there, and start doing research that reflects ourselves. But I still think that it’s a struggle to get there, and it’s a struggle to be heard and be respected.
It’s a matter of pride, it’s a matter of proving yourself, being in STEM, and [women in STEM] still report being extremely disrespected, not taken seriously all, despite being very very good.
It’s worth noting as well, that we’ve had women in STEM for a while and there are so many things we appreciate nowadays that they were a part of, but they were never given credit for—it’s still a problem today and something we need to more actively fight.❞
Isabella F. Lima, Occupational Psychologist
Are you a woman in STEM, and have a story to tell? We’d love to hear it! Just reply to this email 🙂
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