42 books and quotes that shaped and inspired me in 2021

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“Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers.”

Charles W. Eliot

The transition from the old year to the new is, for many, a time for review and reflection. Personally, a big part…

A recent study shows that auditory stimuli and narratives have a clear and reproducible effect on our heart rate

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No one will be too surprised to hear that certain aspects of stories — say a surprise scare in a horror movie — can influence our physiology, specifically our heart rate.

What is however more interesting is the result of a recent study published in Cell Reports which showed that…

Noble Leisure

How one the most successful tech entrepreneurs in history came to rethink his approach to work-life-balance and what we can learn from it.

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“It is with deep sadness that I observe the current culture of intensity in the tech industry. […] These companies are both destroying the personal lives of their employees and getting nothing in return.”

— Dustin Moskovitz

Whether through personal experience, depictions in movies or shows like The Social Network

A self-study, and initial considerations on sound design for resonance breathing

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[TLDR: I designed soundscapes specifically for resonance breathing, and tested them on myself, showing on average a 25% increase in HRV compared to silence. I have also released the soundscapes for a range of different breathing frequencies on all major music platforms.]

Sounds and music can have a profound impact…

Introducing the Idea of a “Resonance Ratio.”

It is well established that breathing at a certain frequency, known as the resonance frequency, triggers a strong cardiovascular response that maximizes heart rate variability (HRV). Determining this frequency, which varies from person to person, usually forms the starting point for HRV biofeedback training.

What is however less often considered…

Noble Leisure

Wading through the shallows of loneliness to discover deep blissful solitude

A photo of a seating area with a timed exposure of a light indicating that someone has been there.
Photo by Federico Beccari on Unsplash

We crave connection.

Whether physical or digital, through active interaction with others or by passively observing their lives through news and social media feeds, we want to be connected.

Connection makes us feel like we are part of a community — even more so in times where being part of…

A detailed study to determine the optimal breathing frequency that maximizes HRV response for biofeedback training

Heart rate variability (HRV) biofeedback training promises to strengthen the response of the autonomic nervous system (ANS) and increase adaptability and resilience, physiologically as well as mentally.

It relies on the strong coupling between breath and heart, and more specifically the fact that slow breathing at a certain frequency —…

Noble Leisure

On embracing your inner introvert and finding restorative niches in your daily life.

Image credit: demaerre.

It used to be that character was the highest ideal a person could aspire to.

Actions spoke louder than words.

Being quiet, disciplined, and honorable was seen as good and strong.

But as the late historian Warren Susman remarked, this all changed at the beginning of the 20th century, as…

Max Frenzel, PhD

AI Researcher, Writer, Digital Creative. Passionate about helping you build your rest ethic. Author of the international bestseller Time Off. www.maxfrenzel.com

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