Accuracy here was great, too, only on two occasions have I had to manually edit the sleep data (it took me being lazy on the sofa in the evening as sleeping).ĭaily sleep statistics are compared to the 30-day average to detect any anomalies. And since sleep is a fundamental part of recovery, the Whoop system places a big emphasis on monitoring and analysing sleep. Admittedly, I didn’t take the Whoop 4.0 for really long runs, but I would imagine it would be able to cope well, as long as the battery is adequately charged. It was a similar experience as before, and I saw no evidence of heart rate graph anomalies. The heart rate averages seemed fine.Īs for tracking runs, I took the Whoop 4.0 out for a couple without the phone to see if I could sync the band with the app afterwards (you can add workouts manually). It was struggling a bit when trying to keep up with the peaks and troughs of my heart rate during workouts and after a bigger dip, the Whoop 4.0 seemed to have lost track of the heart rate rhythm. It was on the ball most of the time, and I could clearly see the rising and falling pattern of my heart rate as I did my sets. I think of the ten or so activities I tracked, only once the Whoop 4.0 lost the plot and said my heart stopped. Speaking of workouts: I tested the Whoop 4.0 for a lot of those, mostly strength workouts. Only on occasions did the heart rate reading go off the chart the Whoop 4.0 even performed well during strength workouts which are generally harder to track. Thankfully, Whoop addressed this with the new sensor, which based on my experience is considerably more accurate. (Image credit: Whoop) Whoop 4.0 review: AccuracyĪlthough people liked the Whoop 3.0, it was widely criticised for not being terribly accurate. The Whoop 4.0 can also measure skin temperature, blood oxygen levels, heart rate variability and resting heart rate. It works well as advertised and is a nice touch, especially considering the emphasis on sleep tracking in the Whoop ecosystem. Battery life is not too shabby (around four days on average), especially considering the fitness band uses an optical heart rate sensor.Īnother new thing is the vibration motor that is used for the wake-up alarm. Despite the more lightweight body, the Whoop 4.0 actually improved on battery life thanks to the new Whoop Battery Pack 4.0 technology that uses Sila’s silicon anode battery materials. Overall, the new Whoop 4.0 is 33% lighter than the Whoop 3.0. That said, the Whoop 4.0 introduces an upgraded sensor configuration that now features three green, one red and one infrared LEDs (five in total), four photodiodes, and advanced algorithms to improve accuracy and heart rate measurements (more on accuracy in just a bit). Of course, the actual technology involved is more complicated than this, but Whoop 4.0 is a straightforward device from a day-to-day wear perspective. (Image credit: Whoop) Whoop 4.0 review: DesignĪt first glance, the Whoop 4.0 band comes across as a pretty basic fitness wearable: it’s an optical heart rate sensor unit attached to a band.
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