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Whoop Strap 4.0: Long-term Scientific Review (7 months!)
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Whoop Strap 4.0: Long-term Scientific Review (7 months!)

Introduction and Overview

In this video, the speaker tests the Whoop Strap 4.0 over a period of seven months to analyze its accuracy and effectiveness as a health tracking device. The focus is on three key aspects: heart rate tracking, sleep stage tracking, and skin temperature tracking.

Heart Rate Tracking

  • The speaker tested the accuracy of heart rate tracking during 367 different workouts.
  • Heart rate measurements were compared against the Polar H10 ECG chest strap for accuracy.
  • Cycling indoors was used as an example exercise with minimal arm movement or tension.
  • Accuracy of heart rate measurements during spinning workouts is shown in a graph.

Sleep Stage Tracking

  • Data from 18 nights over the course of seven months was used to evaluate sleep stage tracking.
  • The Whoop Strap 4.0 measures resting heart rate, respiratory rate, heart rate variability, skin temperature, and blood oxygen levels during sleep.
  • Deviations from normal ranges are indicated in the morning, which could suggest potential health issues.

Skin Temperature Tracking

  • Skin temperature tracking during the night is compared to an electronic pill used to track body core temperature.
  • Increased skin temperature may indicate infection or illness such as COVID-19 or flu.
  • The Whoop Strap can be worn in various locations on the body for flexibility.

Cost and Subscription Model

  • The Whoop Strap operates on a subscription model rather than upfront payment for the device itself.
  • Subscriptions range from $20 per month for two years, totaling $480 over that time frame.
  • Users need to decide if the cost is worth it based on their needs and preferences.

Conclusion

The Whoop Strap 4.0 is found to be a well-rounded device with good sleep tracking capabilities. However, further analysis will be provided in subsequent sections of the video regarding other features and metrics.

Heart Rate Agreement between Whoop Strap 4.0 and ECG Chest Strap

In this section, the agreement between the Whoop Strap 4.0 and an ECG chest strap in measuring heart rate is discussed.

Comparison of Heart Rate Measurements

  • The points on a graph represent the agreement between the Whoop Strap 4.0 and the ECG chest strap.
  • A good agreement is observed, with most points along a blue line indicating similar heart rate measurements.
  • Some points in higher heart rate ranges are slightly below the blue line, suggesting a slightly lower heart rate detected by the Whoop Strap.
  • The correlation value (r) between the two devices is 0.94, indicating a strong relationship.

Individual Training Sessions Analysis

This section examines individual training sessions to understand why some values deviate from the expected agreement between the Whoop Strap 4.0 and ECG chest strap.

Example Interval Spinning Session

  • A specific interval spinning session is analyzed using clock time on the horizontal axis and heart rate on the vertical axis.
  • The Whoop Strap 4.0 shows good agreement with the ECG chest strap but consistently detects a slightly lower heart rate.
  • In some workouts, such as peak intervals, there are larger discrepancies where the Whoop Strap detects significantly lower heart rates.
  • Certain training sessions show even worse performance at detecting accurate heart rates initially.

Comparison with Other Watches

This section compares the performance of the Whoop Strap 4.0 with other watches tested over two years.

Correlation Value Comparison

  • The correlation value (r) is used as a metric for comparison, with higher values indicating better accuracy.
  • The Whoop Strap 4.0 performs well compared to other watches, with a correlation value similar to the Polar Verity Sense and previous generation Whoop Strap 3.0.
  • However, it does not outperform watches like Apple Watch and Huawei WatchFit 2 and GT3 series.

Heart Rate Accuracy for Outdoor Cycling

This section focuses on the accuracy of heart rate measurements during outdoor cycling.

Comparison with ECG Chest Strap

  • The agreement between the Whoop Strap 4.0 and ECG chest strap is still good for outdoor cycling but shows a tendency for slightly lower heart rate measurements.
  • The correlation value decreases to 0.75 compared to indoor cycling.

Smoothing Effect on Heart Rate Data

  • The Whoop Strap tends to show a smoothed version of the actual heart rate data, missing some peaks and valleys.
  • This effect is observed in various bike rides, where general patterns are tracked but details are missed.

Overall Performance Summary

This section provides an overall summary of the Whoop Strap 4.0's performance in tracking heart rate during different exercises.

  • For indoor cycling, the Whoop Strap 4.0 performs quite well compared to other watches but is outperformed by Apple Watch and Huawei WatchFit 2 and GT3 series.
  • Outdoor cycling poses challenges for accurate heart rate readings due to wrist movement, resulting in some missed details by the Whoop Strap.
  • Other watches and fitness trackers may have better performance in these scenarios.

Timestamps provided are approximate as they were not available in the original transcript.

Heart Rate Tracking during Cycling

The Whoop Strap's heart rate tracking performance during cycling is not as good as when used for indoor cycling. It falls in the upper middle class of heart rate trackers, but Apple Watches and some Huawei watches outperform it.

Heart Rate Tracking Performance during Cycling

  • The Whoop Strap's heart rate tracking during outdoor cycling is not as accurate as indoor cycling.
  • Compared to other heart rate trackers, it falls in the upper middle class.
  • Apple Watches and some Huawei watches perform better than the Whoop Strap for heart rate tracking during cycling.

Heart Rate Tracking during Weight Lifting

Heart rate tracking during weight lifting is more challenging due to increased tension on the wrist and arm. The Whoop Strap's accuracy varies across different training sessions, sometimes keeping up with heart rate increases and other times failing to track peaks accurately.

Heart Rate Tracking Performance during Weight Lifting

  • Weight lifting poses challenges for heart rate tracking due to increased tension on the wrist and arm.
  • The Whoop Strap's accuracy in tracking heart rate peaks varies across different training sessions.
  • In some sessions, it can keep up with the increase in heart rate, while in others, it fails to track peaks accurately.
  • When compared to other watches tested, the Whoop Strap falls somewhere near the middle in terms of consistency with ECG chest straps.
  • For weight lifting, newer Huawei watches and Apple Watches are recommended over the Whoop Strap. ECG chest straps remain the most reliable option for accurate heart rate measurements.

Heart Rate Tracking during Running and Hiking

The Whoop Strap performs reasonably well for heart rate tracking during running and hiking activities. It can track heart rate accurately, with only a slight deviation in some instances.

Heart Rate Tracking Performance during Running and Hiking

  • During interval runs, the Whoop Strap mostly tracks heart rate accurately, with a few beats per minute lower than expected.
  • During a short hike, the Whoop Strap performs well and accurately tracks heart rate throughout most of the activity.

Overall Heart Rate Tracking Performance

The Whoop Strap is considered a decent heart rate tracker overall. It performs above average compared to other watches but still has room for improvement. A rating of 4 out of 5 stars is given for its heart rate tracking performance.

Overall Heart Rate Tracking Performance

  • The Whoop Strap is generally above average as a heart rate tracker.
  • Compared to other watches, it falls somewhere in the middle range.
  • A rating of 4 out of 5 stars is given for its heart rate tracking performance.

Sleep Stage Tracking

The Whoop Strap's sleep stage tracking performance is evaluated by comparing it to an EEG device called Dream 2. While the Dream 2 serves as a good reference point, polysomnography would be the gold standard for this type of test. The results show how well the Whoop Strap detects sleep stages compared to brainwave measurements.

Sleep Stage Tracking Performance

  • The Whoop Strap's sleep stage tracking performance is compared to an EEG device called Dream 2.
  • Polysomnography would be the ideal standard for this type of test.
  • The results show how well the Whoop Strap detects sleep stages compared to brainwave measurements recorded by the EEG device.

Due to limitations in available data, further testing with polysomnography on the Whoop Strap is desired for more accurate evaluation.

Conclusion

The Whoop Strap performs reasonably well for heart rate tracking during running, hiking, and weight lifting activities. However, its accuracy is not as high as some Apple Watches and newer Huawei watches. For sleep stage tracking, the Whoop Strap's performance is evaluated against an EEG device but would benefit from further testing with polysomnography. Overall, the Whoop Strap is considered a decent heart rate tracker but has room for improvement in both heart rate and sleep stage tracking capabilities.

New Section

This section discusses the agreement between the sleep stages detected by the EEG device and the Whoop strap. It analyzes the accuracy of deep sleep and light sleep detection.

Agreement between EEG Device and Whoop Strap

  • Almost 98% of deep sleep detected by the EEG device was also detected by the Whoop strap. [[timestamp]]
  • The Whoop strap detects some extra deep sleep later in the night compared to the EEG device. [[timestamp]]
  • Around 60% of light sleep detected by the EEG device was also detected by the Whoop strap. [[timestamp]]
  • Disagreements between light sleep detection were mostly with deep sleep, with a confusion rate of about 28%. [[timestamp]]

New Section

This section focuses on REM (rapid eye movement) sleep detection and compares it between the EEG device and the Whoop strap.

REM Sleep Detection

  • Approximately 60% agreement in detecting REM sleep between the EEG device and the Whoop strap. [[timestamp]]
  • When there was a difference in predicting REM sleep, it was mostly predicted as light sleep by the Whoop strap. [[timestamp]]
  • The individual nights' analysis shows a good match between REM sleep detection of both devices. [[timestamp]]

New Section

This section examines awake detection and its agreement between the EEG device and the Whoop strap.

Awake Detection

  • Approximately 64% agreement in awake detection between the EEG device and the Whoop strap. [[timestamp]]
  • Confusion in awake detection was mostly with light sleep, which is expected as it is the closest sleep stage to being awake. [[timestamp]]
  • Individual nights' analysis shows some agreement but not perfect, with the Whoop strap detecting fewer awake moments in some cases and more in others. [[timestamp]]

New Section

This section compares the performance of different devices, including the Whoop strap 4.0, in sleep stage tracking.

Comparison of Sleep Stage Tracking Devices

  • The graph shows an overview of agreement between different watches and the EEG device for each sleep stage. [[timestamp]]
  • The Whoop strap 4.0 performs similarly to the Whoop strap 3.0 and other devices like Fitbits and Withings Sleep Analyzer. [[timestamp]]
  • Overall, the Whoop strap 4.0 is among the best consumer-based sleep tracking devices tested, although there is room for improvement in algorithms. [[timestamp]]

New Section

This section concludes by discussing the limitations of sleep stage tracking without polysomnography (PSG) measurements.

Conclusion on Sleep Stage Tracking

  • The Whoop strap 4.0 is one of the best devices currently available for sleep stage tracking without PSG measurements. [[timestamp]]
  • Better algorithms could further improve sleep stage tracking accuracy of the Whoop strap. [[timestamp]]
  • Despite not being perfect, it receives a rating of 4.5 out of 5 stars for sleep stage tracking. [[timestamp]]

New Section

This section discusses the use of temperature measurements by athletes and the author's personal experience with tracking core body temperature during sleep using a device called Whoop Strap 4.0.

Core Body Temperature and Skin Temperature

  • Athletes can use continuous temperature measurements to monitor safety and performance.
  • The author used the Whoop Strap 4.0 to track core body temperature during sleep.
  • Graphs show the fluctuation of core body temperature (plotted in blue) and skin temperature (plotted in black) throughout the night.
  • Core body temperature dropped during the first part of the night and slowly rose again before awakening.
  • Skin temperature showed a continuous increase, influenced by environmental factors like blankets.

Difference Between Core Body Temperature and Skin Temperature

  • Core body temperature and skin temperature are different measurements.
  • Skin temperature is more influenced by environmental factors, such as covering with a blanket.
  • The purpose of measuring skin temperature with Whoop Strap 4.0 is likely to detect significant deviations from normal skin temperatures, such as those caused by viral infections.

Potential Use Cases for Skin Temperature Measurements

  • Researching potential use cases for skin temperature measurements and how the body regulates core versus skin temperatures.
  • Seeking input or knowledge from viewers regarding this topic.

Additional Considerations

  • The advantage of not necessarily wearing the Whoop Strap on the wrist allows for wearing it during formal occasions, but further testing is needed to determine if performance differs based on placement.
  • The material of the Whoop Strap band is nice but takes a while to dry when wet.
  • Difficulty obtaining data export from Whoop, which took several months of communication.

Overall Performance Review

  • Positive feedback on heart rate tracking and sleep tracking capabilities of the Whoop Strap 4.0.
  • Requires a phone for GPS tracking during activities like running or cycling.
  • Rating the Whoop Strap between four and four and a half stars out of five, considering the relatively high price.

Affiliate Links and Recommendations

  • Providing an affiliate link for viewers to try the Whoop Strap with a discount.
  • Recommending Apple Watch for iOS users and Huawei watches for Android users focused on heart rate tracking.

The summary has been written in English as per the given instructions.

Video description

🔴 Affiliate* link: https://join.whoop.com/QuantifiedScientist ($$$/€€€ off any new WHOOP membership) 🔴 General Amazon link*: https://geni.us/thequantifiedscientist 🟢 Instagram: https://www.instagram.com/quantified_scientist/ 🟠 Shorts: https://studio.youtube.com/channel/UCcpARGzXNaC62UQWns2dh2Q 🔵 Newsletter: www.robterhorst.com 🟡 Twitter: @QuantifiedRob 🟢 MyTemp Temperature Pill: http://mytemp.eu/products/ . Thanks a lot to purpleXus for lending me this pill! * Affiliate (paid) links support the channel by earning me a commission on any sale, and it doesn't cost you any more! My opinions are completely my own, and this content is not sponsored. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 👇 $30 off any new WHOOP membership, affiliate* (paid) link, supports the channel!👇 https://join.whoop.com/QuantifiedScientist ($30 off any new WHOOP membership) ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 👇Amazon Affiliate* (paid) links. Supports the channel, doesn't cost you any more!👇 ▬▬▬▬▬▬▬▬▬▬BEST WATCHES▬▬▬▬▬▬▬▬▬▬ Whoop Strap 4.0: https://join.whoop.com/QuantifiedScientist ($30 off any new WHOOP membership) General Amazon link: https://geni.us/thequantifiedscientist Huawei Watch Fit 2: https://geni.us/HuaweiWatchFit2 Huawei Watch GT3 Pro: https://geni.us/thequantifiedscientist Huawei Watch GT Runner: https://geni.us/HuaweiWatchGtRunner Huawei Watch GT 3: https://geni.us/Huawei_Watch_GT3 Apple Watch 7 41 mm: https://geni.us/AppleWatch7_41 Apple Watch 7 45 mm: https://geni.us/AppleWatch7 Apple Watch 6: https://geni.us/0gNGeO Apple Watch SE: https://geni.us/Apple_Watch_SE_44 Garmin Venu 2: https://geni.us/Garmin_Venu_2 Garmin Instinct 2: https://geni.us/Garmin_Instinct_2 Polar H10: https://geni.us/hnXc Polar OH1+: https://geni.us/D7bs5 Polar Verity Sense: https://geni.us/polarVeritySense ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 📸My Gear* (paid links, supports the channel and doesn’t cost you any more)📸 Camera body (main): https://geni.us/SonyA6600_body Camera lense (main): https://geni.us/SigmaContemporary Camera (B-roll): https://geni.us/CanonEosM50MarkII and https://geni.us/Sony_ZVE10 Light: https://geni.us/Godox_VL150 Softbox: https://geni.us/NiceFotoSoftbox Light stand: https://geni.us/WalimexLightstand ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ Timestamps: 00:00 Background 01:47 Whoop Strap 4.0 Features 04:22 Heart Rate Test Spinning 08:47 Heart Rate Test Cycling 11:20 Heart Rate Test Weight Lifting 14:11 Heart Rate Test Other Workouts 15:02 Sleep Stage Testing 20:10 Sleep Stage Test Overview 21:44 Body/Skin Temperature Test 24:16 Other Good and Bad Features 25:11 Health Tracking Conclusions Intro: The Whoop strap as a device mostly focuses on health tracking, and not so much on smartwatch features. This also means it has no screen or any interface at all on the device itself, and it is mostly designed as a health monitoring device. The Whoop Strap keeps track of your health in several ways: it can measure your heart rate, skin temperature, breathing rate, oxygen saturation and heart rate variability. Your heart rate will be measured throughout the day and night, and if you start a sports activity, the frequency of measurements will go up, and the app will show a graph of your heart rate after the workout. What I believe is potentially even more important, is that throughout the night it will measure your resting heart rate, respiratory rate, heart rate variability, skin temperature and blood oxygen levels. Measuring this during the night is one of the optimal times to measure these metrics, and the app will show you if there were any deviations from your normal range, which could indicate there are some health issues. An increased skin temperature could for instance indicate that you are suffering from an infection such as COVID-19 or the flu, and a high resting heart rate could be an indicator of poor recovery. One of the benefits of the Whoop Strap is that you can wear it in many different locations, and I personally prefer to wear it on my biceps, which is also what most of the test results in this video will be based on. However, Whoop offers many more options of where to wear the device itself, and the device should be able to work out where it is located automatically. You can for instance wear the whoop strap 4.0 in your boxers, thong or in a compression top. The major downside of the Whoop Strap for me is the cost. Whoop has completely embraced the subscription model, charging you a certain amount of money each month to use their device and app, but charging you no money up-front for the device itself. The main question I will try to answer in this video is: can we trust the metrics and measurements the Whoop Strap 4.0 provides?