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Heart on Willem's Blog

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!

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Special support: my lovely wife, Ellen!
Special support: my lovely wife, Ellen!
Playing drama is a team effort - and the on stage interaction is what makes it fun!
Playing drama is a team effort - and the on stage interaction is what makes it fun!
Measuring heart rate at different speeds on both a normal and electric bike
Measuring heart rate at different speeds on both a normal and electric bike
Biostrap iOS app dashboard and daily heart rate
Biostrap iOS app dashboard and daily heart rate
Sneek, 1912 - the first Fietselfstedentocht
Sneek, 1912 - the first Fietselfstedentocht
Not your typical hot tub... taking an ice bath!
Not your typical hot tub... taking an ice bath!
VanMoof Electrified S
VanMoof Electrified S
On the bottom you can see the two red LED's and the PPG sensor. Just like the Swatch Sistem51 movement this is hidden when worn on wrist
On the bottom you can see the two red LED's and the PPG sensor. Just like the Swatch Sistem51 movement this is hidden when worn on wrist
Heart rate during my debut - with annotations explaining what happened
Heart rate during my debut - with annotations explaining what happened
The box contains three straps, charging cable, charger and two sensors
The box contains three straps, charging cable, charger and two sensors
Oh boy... there is no way back when you're face is all around town!
Oh boy... there is no way back when you're face is all around town!
VanMoof's founders, brothers Taco and Ties Carlier
VanMoof's founders, brothers Taco and Ties Carlier
ILU integrated light on the Sensa Cintura Belt Drive bike - it doesn't get blocked by rear luggage, child seats or a long jacket
ILU integrated light on the Sensa Cintura Belt Drive bike - it doesn't get blocked by rear luggage, child seats or a long jacket
Riding my bike with Apple Watch
Riding my bike with Apple Watch
Biostrap, wrist band, collecting health data on a daily basis, providing long term insights
Biostrap, wrist band, collecting health data on a daily basis, providing long term insights
Swimming with Apple Watch (shot with iPhone)
Swimming with Apple Watch (shot with iPhone)
Unlocking the bike using a smartphone
Unlocking the bike using a smartphone
Biostrap on the wrist - now you see me...
Biostrap on the wrist - now you see me...

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