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The importance of normal values

2/6/2022

 
Blog post by Marco Altini
I often talk about your "normal values" as the only meaningful way to make use of Heart Rate Variability (HRV) data. But what are these normal values? Why are they important?

Simply put, your normal values are a representation of your historical data. They allow you to understand if acute (daily) and chronic (weekly) HRV responses are showing meaningful changes or just small variations that you should not worry about.

Normal values make the data actionable.

Why do we need normal values? This has to do with the high day to day variability in HRV data. It might be easier to show this with an example. Let's look at the data below. This is typical HRV data, there is much variability between consecutive days.

Should the highlighted reduction trigger concerns and adjustments in our plans or not?
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Read More

3 Key Steps to Make Use of Heart Rate Variability (HRV) data

1/19/2022

 
Technology for Heart Rate Variability (HRV) measurement at rest is getting better every day.

However, using a sensor able to measure accurately, is only the first step. In order to make use of HRV data, we need to make sure that the data is not only measured accurately, but measured at a meaningful time.

Here is where many sensors that measure automatically fail.

Finally, once we have collected accurate data at the right time, we need to be able to interpret that data, accounting for the high day-to-day variability in HRV. This last step is key to actionability.

1. Collect accurate data
2. Collect meaningful data
3. Interpret the data

Check out our latest blog to learn more.
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Heart Rate Variability Coefficient of Variation

1/13/2022

 
Blog post by Marco Altini

​One of the most interesting ways to analyze heart rate variability (HRV) data is to look at the amount of day-to-day variability in your HRV scores. That's what we call the Coefficient of Variation (CV HRV)

The CV HRV is different from your baseline, which is simply the average of your scores over a week. In simple terms, the CV HRV reflects how much your scores jump around on a day to day basis.
  • Lots of jumping around = high CV
  • HRV Stable values = low CV HRV​​
​
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Why do we care?

Normally, the most important aspect to analyze is how your baseline is going with respect to your normal values.

A baseline within normal values shows a stable physiological condition and good adaptation (check out this blog for more information about the normal range
) 
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However, the amount of day to day variability (the CV HRV), combined with baseline changes with respect to normal values, can provide additional insights on adaptation to training and other stressors.

The CV HRV can flag issues in response to stress, before a baseline reduction. Quoting Andrew Flatt 
”the preservation of autonomic activity and less fluctuations (reduced CV HRV) seem to reflect a positive coping response ... In fact, individuals who demonstrated the lowest CV HRV during increased load showed the most favorable changes in performance"

A reduced CV HRV is often associated with coping well with training. This means also that larger fluctuations in CV HRV are signs of poor adaptation and might reflect issues in maintaining homeostatic control.

How do you use the CV HRV? 

Let's look at one example.

​​I've discussed before how "work stress" is what drives changes in HRV for me (that's where I need to "perform"). Below you can see two similarly stable HRV trends (in the boxes), as well as my increasing subjective stress.

What about the CV HRV? Was it capturing anything differently?
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Let's look at the data.

We can see how the HRV response to increased stress was still within my normal range but included a lot of jumping around (high CV), which represents a poor response, eventually leading to suppressed HRV.

Only reducing the stressor finally caused a rebound to normal.
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The CV HRV had captured very well the poor response.

Learning what drives big changes in stress is probably the first step to do something about it, whenever it's possible.

Short recap

Ideally, in the medium term, these are good trends we should hope to see if we are responding well to the various stressors in our lives:
  • HRV stable and within normal range or slightly increasing
  • Stable or reducing CV HRV

Pay attention to deviations from these trends to spot potential issues in advance, which is easy to do in the HRV4Training app.

You can
 learn more about trends in resting physiology, in this blog post. I hope you have found this blog informative!

rMSSD in HRV4Training Pro

1/5/2022

 
We've made a few changes in HRV4Training Pro

You can now select rMSSD on the Overview page. As the name implies, the Overview page gives you an overview of your physiology, training load, and subjective data (see here for some examples)

You can try Pro here: https://hrv4t.com
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If you need a refresher on rMSSD and the different HRV features, I put together this blog post where I cover all of the most important ones

Our recommendation would be to keep it simple, and use only what we call HRV in the app (which is simply a transformation of rMSSD), or rMSSD, a clear marker of parasympathetic activity (i.e. a lower value with respect to your historical data is associated with higher stress)

If you use HRV4Training Pro with your athletes, clients or team, we have made some changes to the Coach Panel too, so that you can select rMSSD and quickly see the daily HRV with respect to each athlete's normal range, as shown below

This should make it easier to use the data to identify periods of higher stress, e.g. a daily score below an athlete's normal range. Pro allows you also to add some context, for example looking at annotations such as the one identifying menstruation days in the example below ​
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We hope you'll enjoy the latest update and wish you a happy new year

Ambassadors 2022

1/4/2022

 
Welcome to the HRV4Training team to all our new ambassadors

Full list at this link

Looking forward to working together in the next months

Thank you for your support and all the best for the new year!
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80/20 endurance

12/24/2021

 
Blog post by Marco Altini

​
In this podcast, I chat with Matt and Hanna at 80/20 endurance.

I’ve learned a lot over the years from Matt’s books, and it was a real pleasure to spend some time talking about HRV and training.

​Thank you & enjoy
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New HRV trends analysis in HRV4Training

12/15/2021

 
We have just released the latest HRV4Training update, including our new trends detection, which combines:
  • daily HRV with respect to your normal range
  • 2 weeks trend in resting heart rate and HRV
  • HRV coefficient of variation

if you are a HRV4Training Pro user, with the latest update you will also be able to see the detected trend in the baseline page, together with your normal range.

You can try Pro for free by logging in at HRV4T.com, here.

​
Enjoy the update and see you next year for more.
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The Use Case for Heart Rate Variability with Marco Altini and Corrine Malcolm | Koopcast

12/9/2021

 
Blog post by Marco Altini

Last week I had the opportunity to chat with Jason Koop and Corrine Malcom about heart rate variability (HRV), "readiness" scores, resting physiology, and wearables, in the context of training

If you are interested in understanding the nuances of these aspects, including their strengths and limitations, this episode is a good starting point

Don't fall for cults or for those who trivialize everything that is human physiology. Instead, strive to understand these aspects, and you'll be a better athlete or coach

​Thanks again for having me!
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Recap of our latest paper, part 2

12/6/2021

 
Blog post by Marco Altini

In the second part of our latest paper, we analyzed individual stress responses to:
  • Training
  • Menstrual cycle
  • Sickness
  • Alcohol intake

Using 1 year of data per person, for 28 000 people. This is in my view the most interesting part of the paper

Why?
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This type of analysis allows us to answer important questions:

Can a morning measurement capture individual stress responses effectively?

Is it worth the trouble to look at HRV, or is HR enough?

​What is the difference between the two, when it comes to stress responses?

Data collection

Measurements and annotations (training intensities, sickness, etc.) were collected using HRV4Training, first thing in the morning Most measurements were taken with the phone camera (validation here).

Let's quickly look at our analysis framework first. How do we analyze individual stress responses? For each person, any given day there will be many stressors. However, if we take hundreds of days of data per person, and look at one stressor at a time, we can isolate the stressor and better understand its impact on resting physiology.

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What did we learn?

Training intensity

​Below are the results for training intensity (low vs high-intensity days). The change in HRV is 4.6% while for heart rate is 1.3% (with respect to a person's average). HRV is therefore more sensitive to this stressor.

The change in HRV does not reduce across age groups, indicating how HRV captures training stress equally well for older individuals, while the change in HR reduces. Additionally, women tend to have a less marked response (more about this later)


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We also split the annotated intensity into four categories, as shown below. Once again we can see how HRV is more sensitive to changes in training intensity, but also how these measurements capture very well self-reported training intensities:
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Menstrual cycle

The change in heart rate was 1.6% between the follicular and the luteal phases, while the change in HRV was 3.2%. Once again, HRV is more sensitive. These differences might also be the reason why other stressors show somewhat less marked responses in women.
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Alcohol intake

Changes in alcohol intake are 3-4 times larger than changes due to training or the menstrual cycle (6% change in heart rate and 12% change in HRV).
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Sickness

Not surprisingly, sickness is also a very strong stressor, similarly to alcohol intake (6% change in heart rate and 10% change in HRV).
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What are the implications?

When using HRV for training guidance, lifestyle is key, and poor lifestyle or health issues will take over.

A holistic approach to health and performance is needed.

Strength of the stressor

To recap, changes due to training intensity and the menstrual cycle are typically 3-4 times smaller than changes due to sickness or alcohol intake.

Changes in HRV are 2-4 times larger than changes in heart rate in response to the same stressors.

Interpretability

When we contextualize the percentage changes reported in this paper with what we know from literature, e.g. that the smallest practical or meaningful change in heart rate is 2% and in HRV is 3%, we can see how changes in heart rate are below this threshold, and therefore smaller than normal day to day variability.

This means that heart rate is not sensitive enough unless we have very strong stressors (e.g. alcohol intake or sickness). This also means that while HRV is more sensitive, it is also less specific, as shown by the typically smaller effect sizes.

​In other words: changes in heart rate are often of no practical utility (smaller than daily variability). On the other hand, higher stress will be reflected on HRV data no matter where it comes from and it might be difficult to get to the source (context is key).

We speculate that these findings might lead to new forms of HRV-guided training, where rest days are prescribed based on large changes in HR (as these capture only very strong stressors), while training intensity is modulated based on more subtle HRV responses.

You can find the full text of the paper, here.


​Thank you for reading

Recap of our latest paper, part 1

12/3/2021

 
Blog post by Marco Altini

​
In our recent publication, we analyzed the relationship between heart rate and HRV with respect to individual characteristics such as:
  • age
  • sex
  • body mass index (BMI)
  • physical activity level

In a large sample of 28 000 individuals. What did we learn?
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Some of the findings are larger-scale replications of what we knew already Consistent results with published literature that used different data collection procedures is a good first step It gives confidence in the quality of the data when we start digging a bit deeper

Sex

​Women have higher resting heart rate than men, but very similar HRV In fact, at a younger age, women have a slightly higher HRV. This is of interest as a higher heart rate would normally be associated with lower HRV. The discrepancy might be due to hormonal differences.
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BMI

Both underweight and overweight/obese categories show what we have called in the paper a suboptimal physiological profile, meaning that resting heart rate increases and HRV reduces when deviating from the normal range. The strongest deviation is for the obese category.
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Age

There was no correlation between resting heart rate and age, and a moderate correlation between HRV and age. This is one of the most interesting relationships, as heart rate and HRV clearly decouple and are representative of different processes (more on this later).
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Physical activity level

The association between physical activity level and resting physiology is stronger for heart rate (r = 0.30, moderate effect size) than for HRV (r = 0.21, small effect size). When we break this down by age group, things get even more interesting.

The correlation between physical activity level and HRV reduces by age, getting to r = 0.13 for older individuals. Only for very young individuals (20-30 age group) there is a decent association between fitness and HRV.
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Finally, we built models to determine how much variance age, sex, BMI and physical activity level could explain. Are they sufficient to get a good understanding of inter-individual differences? Not really, as they explain 19% of the variance in heart rate and only 15% in HRV.

What are the implications of these findings?

A low HRV in aging individuals might be associated with a deterioration of regulatory mechanisms. The weak link between physical activity and HRV as we age might similarly be associated with reduced baroreceptor sensitivity. On the contrary, increased stroke volume due to high levels of physical activity maintain resting heart rate low even for older age groups. In terms of explained variance, it is clear that genetic factors are key in explaining differences in heart rhythm between people.

An important implication here is that in our opinion, targeting improvements in HRV as intervention goals might not be realistic, given the strong heritability coupled with reductions with age and low explained variance associated with lifestyle factors such as physical activity level.

But there's an important caveat. In this work, we had a large sample. However, this sample is not representative of the whole population, but only of relatively healthy or health-conscious individuals. There might be more to gain for e.g. who never exercises, is overweight, etc.

This is why HRV as an absolute value is of little interest (in our opinion). On the other hand, HRV was able to capture day-to-day stressors within individuals with high sensitivity, as I will cover in a future blog.

You can find the full text of the paper, here. T
hank you for reading!

Latest publication on HRV-guided training

12/2/2021

 
Blog post by Marco Altini

​
Professor Maria Carrasco-Poyatos and co-authors at the University of Almería just published the latest paper on HRV-guided training, titled "Heart rate variability-guided training in professional runners: effects on performance and vagal modulation"

Thank you Maria and co-authors for using HRV4Training and for involving me in this work. You can find the paper, here, including the main highlights:

  • HRV-guided training allows professional runners to achieve higher training intensities.
  • This is reflected in their cardiovascular performance and HRV enhancement.
  • The increment in HRV scores suggest better cardiovascular adaptations.
  • A polarized training is recommended to improve performance and vagal modulation.
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HRV4Training Ambassador Program 2022

11/30/2021

 
HRV4Training is looking for brand ambassadors worldwide

We believe in empowering individuals with the ability to measure and interpret physiological data so that training and lifestyle stressors can be better balanced, resulting in improved health and performance

Learning from athletes and coaches is an invaluable part of the journey, and we are looking forward to getting to know you and your experience
​

Are you passionate about sport and technology and have been using HRV4Training daily at least for 6 months to better balance stress? We are looking for you!

What do we offer to the ambassador and mentors?
  • Ambassadors - free HRV4Training gear: choose between hats, singlet or t-shirt and 1 year free access to HRV4Training Pro, our web platform;
  • Mentors - free access to HRV4Training Pro for you and up to 5 clients for one year;
  • Ambassadors and Mentors will be featured on our website and on social media (mainly IG);
  • Repost of your posts on IG stories.

What do we expect from the ambassadors and mentors?
  • Up to 4 posts per year (on your chosen platform such as IG, FB, Strava, or personal website/blog) to schedule together with our team, where you explain how you use the app; 
  • Ambassadors and Mentors should include an HRV4Training handle in their bio on social media;
  • Ambassadors should send us a photo of them wearing the singlet that we can share on our website and social media;

We are going to select up to 30 brand ambassadors, we accept applications in English, Italian and Spanish. Would you like to spread the word about HRV4Training in another language? Send us a message with your proposal for our consideration!

​​To participate in the selection process, fill in this google form. 

Deadline is November 30th, 2021
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What Is Behind Changes in Resting Heart Rate and Heart Rate Variability? A Large-Scale Analysis of Longitudinal Measurements Acquired in Free-Living

11/29/2021

 
Blog post by Marco Altini

​
Excited to share our latest paper on heart rate and heart rate variability (HRV):
  • 9 million morning measurements taken with HRV4Training over a period of 5 years 
  • Population-level analysis: relationship between resting physiology (heart rate, HRV) and age, sex, BMI, and physical activity
  • Acute stress responses analysis: relationship between resting physiology (heart rate, HRV) and training, alcohol, menstrual cycle, and sickness

This one has been in the making for a long time, and brings it all together: developing an accurate and affordable method to measure resting physiology, analyzing data at a scale that goes far beyond what we can do in the lab, and as a result, new, valuable insights

Give it a read, here
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Heart rate variability (HRV) during taper

11/19/2021

 
Blog post by Marco Altini


​
You’ve been preparing your race for several months and it’s finally time to taper. Training went really well and you are doing everything right

And yet, your heart rate variability (HRV) reduces

Learn more about HRV during taper, in my latest blog
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Heart Rate Variability (HRV) trends: going beyond daily scores

11/11/2021

 
Blog post by Marco Altini


​
Heart rate variability (HRV) trends over long periods of time (e.g. from weeks to months) are one of the most interesting and complex aspects to analyze when it comes to resting physiology

While day-to-day (or acute) changes reflect well stressors such as training intensity, the menstrual cycle, sickness, alcohol intake, or travel in the day(s) before the measurement, in the long term things are quite different

In this post, I will cover our approach to trends analysis in HRV4Training, and cover some of the features in the app that should help you make sense of the data in the longer term

Learn more, here
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Heart rate variability (HRV) and body position: lying down or sitting?

11/8/2021

 
Blog post by Marco Altini
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Daily measurements and 7-days moving average for lying down (left) and sitting (right) measurements

​A few months ago after an interesting chat with an elite team and Andrew Flatt, I started measuring my HRV in the morning while both 1) lying down and 2) sitting.

Normally, I have always been measuring while lying down in bed, but Andrew brought up some interesting points which I thought were worth investigating further, at least in my own data.

In particular, the reason for doing so, is the following: adding a little stress (e.g. sitting or standing instead of lying down), might better capture your physiological response (or capacity to deal with stress for the day).

​It's a physiological challenge (more on this later).

In terms of the protocol, i would up and measure while lying down in bed, using HRV4Training (phone camera for one minute). At that point, I would sit, and after a few seconds, I'd measure also while sitting (another minute with the camera). Between measurement, the time would be rather short, something like 30 seconds.

Let's look at the data. First of all, I'd like to stress how simple measures of agreement might be inadequate, e.g. correlation (often reported) does not tell us anything about deviations from normality. 
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Correlation between daily measurements (left) and 7-days moving averages (right) for lying down and sitting data
​

While we can have a look at day-to-day correlation and baseline correlations, as shown above, a better way to understand if we are capturing the same information is to use the data the way it should be used for decision making: monitoring deviations from our historical data and normal values (acute drops, etc.).

How do we do that? 

We can use part of the data to compute the normal values (40-60 days), then look at baseline and acute drops.

Here both measures show very similar responses: highly suppressed HRV on the same days, baseline reaching the bottom of the normal range the same period, etc. - it is quite clear that both lying down and sitting are capturing the same trends (which would result in the same advice, especially for acute drops and baseline changes, the two key factors in HRV-guided training):
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To sum up: in my data, both measures are very similar, especially in the longer term (baseline correlation) as well as in terms of acute drops (single days below the normal range, highlighted in blue in the previous image).

What differed?

Lying down seems like a squeezed version of sitting. Paraphrasing Andrew, applying a little stress (e.g. sitting) might better uncover the physiological response response, and this in turn,  might explain the higher day to day variability when sitting. Note that this doesn't mean HRV will be lower (quite the contrary).

Anecdotally I've heard from quite a few people that "when switching to night data, my physiology never changes" (unless sick, or drinking too much, e.g. very large stressors)

Do measurements while lying down, and in particular night measurements simply lead to less day-to-day variability or is this associated to the measurement being less responsive to stressors, due to lack of a physiological challenge?

In my opinion, both positions are valid and rather similar, as shown by the data here. While some have quite a dogmatic approach ("never measure in this or that position"), it is clear that the same processes are captured. However, there are also differences, and it is important to think it through and consider potential mechanisms and what could be best in an individual case.

Most likely, the level of the athlete, baseline HRV (e.g. on the low vs high side of population values), type of sport practiced by the athlete (e.g. endurance or not), as well as other factors such as the application of interest (daily guidance or monitoring long term trends, performance or health oriented) and practical considerations (what modality makes it easier for the athlete to collect daily measurements consistently) should play a role in this decision. One minute of your time might be worth the insights after all.


I hope you have found this blog useful, feel free to follow up here on Twitter.
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Lying down (left) and sitting (right), including HRV4Training's detected trend

On Stress, Glucose and Heart Rate Variability (HRV)

10/27/2021

 
Blog post by Marco Altini

​
How does the body respond to stress?

Below I look at heart rate variability (HRV), heart rate, and glucose in response to two very different weeks (N = 1).

High vs low stress:
  • 42% decrease in HRV
  • 9% increase in resting heart rate
  • 13% increase in 24h average glucose
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Some context first

Last summer in July I had a strong negative stress response (cumulative stressors), resulting in arrhythmia and concerns for my health I've talked about this before, but here I want to focus on what happened to glucose during that week.


Coincidentally, I was wearing a continuous glucose monitor (CGM) since the previous week and noticed that after meals, my glucose was spiking really high, near 200 mg/dL, consistently.

Very interesting to see poor regulation at work so clearly.
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As usual, I was also monitoring my resting physiology (HRV and HR) using HRV4Training (morning measurements), and saw quite a dip in HRV, as well as a minor change in heart rate This is the type of stress response I often discuss (see for example my guide here).

​Physiologically, we know that high stress is associated acutely and chronically with elevated glucose in the bloodstream and reduced parasympathetic activity Pretty neat to see it with simple measurements and currently available technology.

Interview for The Run Testers

10/27/2021

 
Blog post by Marco Altini


​
In this interview, we cover:
  • What is HRV and why is it important
  • How to monitor your HRV effectively
  • How to use HRV to guide your training
  • What devices are best Interview link
​
Thank you Kieran for having me on your channel

Podcast for Trail and Error

10/27/2021

 
​Blog post by Marco Altini
"If you've ever wondered how to tap into the secrets of how that pump in your chest can help you to train faster, harder and longer Marco is just the man to listen to."

“We've been using Marco's app for a while to understand how to better regulate training and recovery and in this episode we do a deep dive on the how and why”

​I’ve really enjoyed talking to ultrarunners Jay and Tris about HRV, thanks for having me!

​Episode here.
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Resting Heart Rate and Heart Rate Variability (HRV): What’s the Difference? — Part 5, takeaways

9/30/2021

 
Blog post by Marco Altini

In part 1 of this series, I covered the basic physiology of heart rhythm regulation. In part 2, I discussed the technology required for these measurements, why some sensors can be trusted, and why others can be used just for resting heart rate, and not for HRV. In part 3, we started looking at the data, with an analysis of population-level differences in resting heart rate and HRV. Finally, in part 4 we covered the most interesting aspect: individual-level data.
​
In this final part, I will report the main takeaways of the previous four parts, as a final wrap-up.

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HRV4Training featured in Men's Fitness

9/30/2021

 
“HRV reflects your physiological responses to all stressors, not just training stress,” says Marco Altini, “Tracking HRV allows us to better understand our own response to training and lifestyle stressors, so that we can make meaningful adjustments towards improved health and performance"

Thank you Men's Fitness Mag  and Kieran for featuring HRV4Training and ŌURA. Find the article, here
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The Big Picture

9/27/2021

 
Blog post by Marco Altini

The past few months have included lots of ups and downs for many of us. Personally, I've experienced some of the worst stressors of the past years, culminating (somewhat ironically) in heart issues, which were fortunately resolved.

Below is an overview of my data, showing how morning measurements of heart rate variability can capture very effectively not only the day-to-day acute stressors we are often discussing (a hard training session, the menstrual cycle, alcohol, the acute phase of sickness), but also longer term, or more chronic changes.

Don't forget to look at the big picture.
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Support for iPhone 13

9/27/2021

 
Blog post by Marco Altini

​
We have just released the latest HRV4Training update, adding support for the new generation of iPhone 13. You can find some data of our first tests, here.

Enjoy another year of accurate and inexpensive physiological measurements.
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Resting Heart Rate and Heart Rate Variability (HRV): What’s the Difference? — Part 4, individual-level data

9/17/2021

 
Blog post by Marco Altini
In part 1 of this series, I covered the basic physiology of heart rhythm regulation. In part 2, I discussed the technology required for these measurements, why some sensors can be trusted, and why others can be used just for resting heart rate, and not for HRV. In part 3, we started looking at the data, with an analysis of population-level differences in resting heart rate and HRV.
In this blog, we finally get to the most interesting aspect: individual-level data. Needless to say, both resting heart rate and HRV become a lot more useful when tracked over time within individuals, and this is exactly what I’ll be showing here. I’ll also try to highlight some of the differences between these two parameters, so that you can better understand what the data means when tracked in response to strong acute stressors (e.g. training, sickness, alcohol intake, the menstrual cycle) and in the longer run (e.g. changes in fitness).

You can find the blog, here.
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Heart Rate Variability Course by Daniel Plews

9/2/2021

 
Blog post by Marco Altini


There is a new heart rate variability (HRV) course out there, put together by Daniel Plews, one of the most prominent scientists in the field.

The course is split into two parts, part 1 covering the basics and technology, and part 2, a fantastic resource covering: 
  • HRV & training adaptations
  • HRV guided training
  • interpreting changes
  • Threshold detection

Additionally, if you use HRV4Training Pro, you'll see how to use the platform in the context of the points above, as Daniel goes over many examples showing our platform. We highly recommend it, for both individuals trying to get the most out of their data, and coaches using these tools with their athletes. 

Check out the course here and try HRV4Training Pro for free, here
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    This blog is curated by
    Marco Altini, founder of HRV4Training


    ​Blog Index
    ​
    The Ultimate Guide to HRV
    1: Measurement setup
    2: Interpreting your data
    3: Case studies and practical examples

    How To
    1. Intro to HRV
    ​2. How to use HRV, the basics
    3. HRV guided training
    ​4. HRV and training load
    ​
    5. HRV, strength & power
    6. Overview in HRV4Training Pro​
    7. HRV in team sports
    ​

    HRV Measurements
    Best Practices

    1. Context & Time of the Day
    2. Duration
    ​
    3. Paced breathing
    4. Orthostatic Test
    5. Slides HRV overview
    6. Normal values and historical data
    ​7. HRV features
    ​
    Data Analysis
    1a. Acute Changes in HRV
    (individual level)

    1b. Acute Changes in HRV (population level)
    ​
    1c. Acute Changes in HRV & measurement consistency
    1d. Acute Changes in HRV in endurance and power sports​
    2a. Interpreting HRV Trends
    2​b. HRV Baseline Trends & CV
    3. ​Tags & Correlations​
    4. Ectopic beats & motion artifacts
    5. HRV4Training Insights
    6. HRV4Training & Sports Science
    7. HRV & fitness / training load
    ​8. HRV & performance
    9. VO2max models
    10. Repeated HRV measurements
    11. VO2max and performance
    12. HR, HRV and performance
    13. Training intensity & performance​
    14. Publication: VO2max & running performance
    ​
    15. Estimating running performance
    16. Coefficient of Variation
    17. More on CV and the big picture
    ​​​​​18. Case study marathon training
    19. Case study injury and lifestyle stress
    20. HRV and menstrual cycle
    21. Cardiac decoupling
    22. FTP, lactate threshold, half and full marathon time estimates
    ​23. Training Monotony
    ​
    Camera & Sensors
    1. ECG vs Polar & Mio Alpha
    2a. Camera vs Polar
    2b. Camera vs Polar iOS10
    2c. iPhone 7+ vs Polar
    2d. Comparison of PPG sensors
    3. Camera measurement guidelines
    4. Validation paper
    ​5. Android camera vs Chest strap
    ​6. Scosche Rhythm24
    ​7. Apple Watch
    8. CorSense
    ​
    9. Samsung Galaxy
    ​
    App Features
    ​1. Features and Recovery Points
    2. Daily advice
    3. HRV4Training insights
    4. Sleep tracking
    5. Training load analysis
    ​6a. Integration with Strava
    6b. Integration with TrainingPeaks
    6c. Integration with SportTracks
    6d. Integration with Genetrainer
    ​
    6e. Integration with Apple Health
    ​
    ​6f. Integration with Todays Plan
    7. Acute HRV changes by sport
    8. Remote tags in HRV4T Coach
    9. VO2max Estimation
    ​
    10. Acute stressors analysis
    11. Training Polarization
    ​
    12. Lactate Threshold Estimation
    13. Functional Threshold Power(FTP) Estimation for cyclists
    14. Aerobic Endurance analysis
    15. Intervals Analysis
    ​​​16. Training Planning
    17. Integration with Oura
    18. Aerobic efficiency and cardiac decoupling
    ​
    Other
    1. HRV normal values​
    ​2. HRV normalization by HR
    ​
    3. HRV 101

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