willem.com

Heart on Willem's Blog

Born with MCADD

Medium chain acyl-CoA dehydrogenase deficiency

Jan. 29, 2019
Our son was diagnosed with MCADD days after he was born. We experienced a metabolic crisis but were lucky to be just in time!

Just days after our son was born, we ran into trouble when our little man didn't want to eat anymore. Repeated attempts to feed him failed as he appeared to be too tired to drink from his mother. When we measured his body temperature we were shocked, only 33º Celsius! What followed was nothing less than an incredible emotional rollercoaster!

My first weeks as dad

On the challenges and rewards of being a father

Jan. 24, 2019
Last Christmas my wife gave birth of our son. It's a life changing experience to become a parent. Read along for my (biometric) findings and some practical tips.

Last Christmas my wife gave birth to our son, a little boy that would change everything! It's an incredible experience to become a parent, especially if it is your first kid. It introduces a whole new way of living, having to deal with regular feeding, caring and sleepless nights. Read along for my (biometric) findings and some practical tips!

Do amazing things with a focused mind

Taking an ice bath and swimming in the Amstel river

Dec. 6, 2018
Read about my experience during the workshop I got as a birth day present involving the Wim Hof Method.

Just when the temperature was a low 2° Celsius, I jumped in the Amstel river! While it was nearly freezing outside I went for a swim, just moments after I've taken an ice bath! This post is about the incredible birthday present I got, a workshop involving the Wim Hof Method.

Swimming and cycling with Apple Watch

Different activities in the workout app in watchOS

Sep. 27, 2018
This month I tested the newest watchOS while swimming and cycling.

This month Apple launched a new Apple Watch series and released an update to watchOS. The focus of the smartwatch is more and more gearing towards health and fitness. This made me curious, how well does Apple Watch work for different activities?

Listen to your body

Why I stopped using health and fitness sensors

May 17, 2018
Using health data gathered by sensors and wearables I learned to listen to my body. Now I have stopped using bluetooth sensors all together.

A good customer of mine was once a physiotherapist, he told me about people asking him to "feel their muscles" to tell them how they where doing. "Crazy!" he told me: "I can never feel better than the people themselves, if they only would listen to their body". This caused me to question the health and fitness sensors I use.

Outside the comfort zone: amateur acting

Wearing an heart rate monitor during my debut performance

Apr. 18, 2018
This month I strapped myself with sensors during a little experiment outside my comfort zone: I debuted as amateur actor!

This month I made my debut as amateur actor. I am no Hollywood star, nor do I envy to become one. But I do like crazy experiments and operating outside of my comfort zone often leads to new and refreshing insights. I took part in an amateur drama play and - in the name of science and fun - strapped myself with sensors to measure what happened to my body.

Commuting by bike

One week (240KM) on the VanMoof Electrified S

Dec. 2, 2017
One week on the VanMoof Electrified S E-bike testing it for commuting and comparing it to a normal bike.

For a few years now, I commute to work using a bicycle. I have lost more than 15KG since I stopped using my scooter. This week I tested a VanMoof Electrified S, an electric bike with an industrial, minimal design. Is it any good? How does it compare to a normal bike? Will an electric bike make you lazy? Read along to find out!

Collecting health data with Biostrap

Wearing a clinical-grade photoplethysmography (PPG) sensor for a month

Nov. 15, 2017
Wearing a clinical-grade PPG sensor for a month to collect advanced biometrics from my wrist.

Most wearables (smartwatches, fitness trackers, etc.) use very basic sensors to capture heart rate. Their signal is binary: just counting beats. Biostrap is different, instead of just checking pulses, it captures a high-fidelity PPG waveform. These waveforms are the same kind that doctors use, making me wonder what I could learn from them!

Fietselfstedentocht 2017

Cycling the 235KM bicycle tour through Friesland

June 30, 2017
Cycling the 235KM long Fietselfstedentocht through Friesland

This month I cycled the Fietselfstedentocht, a 235KM tour through Friesland. This tour brings you through various Frisian cities throughout one of the most Northern provinces of the Netherlands. The tour was first organised in 1912 and has grown to become legendary due to its history, challenge and popularity; well worthy of a blog post!

All blog posts
It felt like victory to see him drinking again!
It felt like victory to see him drinking again!
Data from a mediocre night (with minimal HRV recovery)
Data from a mediocre night (with minimal HRV recovery)
Nocturnal HRV trend, an indicator how fit you are, has stabilised, too
Nocturnal HRV trend, an indicator how fit you are, has stabilised, too
For sure I will need some time to get used to not wearing sensors... note the white stripe on my wrist :-)
For sure I will need some time to get used to not wearing sensors... note the white stripe on my wrist :-)
Saving the life of our son - note the heart rate monitor being unable to detect heart activity (the green question mark)...
Saving the life of our son - note the heart rate monitor being unable to detect heart activity (the green question mark)...
Room service by daddy: smoked salmon as starter
Room service by daddy: smoked salmon as starter
The VanMoof app
The VanMoof app
Carrying a baby during household tasks is fun and useful
Carrying a baby during household tasks is fun and useful
Smile inducing speed advantage over other traffic during rush hour
Smile inducing speed advantage over other traffic during rush hour
The bike features a sporty city steer and an integrated touchscreen in the frame
The bike features a sporty city steer and an integrated touchscreen in the frame
Lock chain inside a small luggage compartment
Lock chain inside a small luggage compartment
At least he got a cool Garfield adhesive band aid
At least he got a cool Garfield adhesive band aid
Left: a full week of sleep data - right: one night in detail
Left: a full week of sleep data - right: one night in detail
Our son
Our son
Holding my son for the very first time - trying to make sense what the little man wants... (a recurring theme as I would find out)
Holding my son for the very first time - trying to make sense what the little man wants... (a recurring theme as I would find out)
Big Ben tires from Schwalbe
Big Ben tires from Schwalbe
Resting heart rate no longer has any red spikes - relatively stable since I stopped drinking beer
Resting heart rate no longer has any red spikes - relatively stable since I stopped drinking beer
SRAM Automatix two speed gear hub - hate it or love it
SRAM Automatix two speed gear hub - hate it or love it

More Heart on Willem's Blog

All blog posts