The Quantified Scientist presents a detailed review below of the Pixel Watch 5, focusing on its performance in health and fitness tracking. Over a week of rigorous testing, the watch’s GPS accuracy, heart rate monitoring and sleep tracking were evaluated across various scenarios. Notably, the GPS system incorporates 3D mapping-aided corrections, enhancing route accuracy in urban environments, though live tracking during activities remains less refined. Similarly, heart rate tracking excelled in activities like running and cycling, achieving near-perfect correlation with chest strap devices, but struggled during weightlifting due to wrist tension. These findings highlight both the strengths and limitations of the Pixel Watch 5 as a fitness companion.
Explore how the Pixel Watch 5 compares to competitors like Garmin and Apple in key areas such as deep sleep detection and long-distance activity tracking. Gain insight into the battery performance of its two size options, including practical constraints for extended outdoor use. Additionally, understand where the watch’s design choices, such as the lack of external chest strap support, may impact certain user needs. This review offers a balanced breakdown of the Pixel Watch 5’s capabilities, helping you assess its suitability for your fitness and lifestyle goals.
TL;DR Key Takeaways :
- The Pixel Watch 5 features an improved GPS system with 3D mapping-aided corrections, offering highly accurate post-activity route mapping, especially in obstructed environments, though live GPS accuracy remains unchanged.
- Heart rate tracking is exceptional across most activities, achieving near-perfect accuracy for indoor cycling, running and biking, but struggles with weightlifting due to wrist tension and lack of external chest strap support.
- Sleep tracking is rated as great, with strong performance in deep sleep detection (88-91% accuracy) and competitive REM sleep detection (64-65%), though occasional heart rate artifacts and slightly lower HRV values suggest room for improvement.
- Battery life varies by model, with the 45mm version lasting longer (up to 10 hours during a hike) compared to the 41mm version (approximately 6 hours), requiring daily charging for both sizes.
- The Pixel Watch 5 competes strongly with Garmin, Fitbit and Apple in GPS, heart rate and sleep tracking, but its limited battery life and lack of weightlifting optimization are notable drawbacks.
GPS Tracking: Repurposed Technology with Promising Results
The Pixel Watch 5 introduces an improved GPS tracking system, using 3D mapping-aided corrections—a technology Google has been using for Google Maps since 2020. This enhancement refines the GPS signal after recording, improving the accuracy of your mapped routes. However, it’s important to note that the live GPS signal during exercise is not the same as the corrected signal you see post-activity.
Interestingly, the total distance traveled during your run or ride is calculated using a combination of live GPS data and other measurements. While the corrected GPS improves the visual accuracy of your route, it does not alter the total distance recorded. Testing revealed that the corrected GPS signals were significantly more accurate, particularly in areas with obstructions like walls or dense urban environments. The Pixel Watch 5’s GPS performance is comparable to Garmin’s flagship Foreigner 970, earning it a score of 90 out of 100, which is rated as “great.”
Heart Rate Tracking: Exceptional Performance with Minor Limitations
The Pixel Watch 5 excels in heart rate tracking during various exercises, offering some of the most accurate wrist-based measurements available. Here’s a breakdown of its performance across different activities:
- Indoor Cycling: Both the 41mm and 45mm versions achieved near-perfect correlation scores of 1.00 and 0.99, respectively. The heart rate data closely matched that of a chest strap reference device, capturing all intervals with precision.
- Running: Running is typically more challenging for wrist-based sensors, but the Pixel Watch 5 maintained high accuracy with correlation scores of 0.98 for the 45mm version and 1.00 for the 41mm version. Minor deviations were observed, likely due to wrist positioning or warming up.
- Biking: Despite the added challenges of wrist tension and road vibrations, the watch performed exceptionally well, achieving a correlation score of 0.99 for both sizes.
- Weightlifting: This was the one area where the Pixel Watch 5 struggled. The intense wrist tension during exercises like bench presses and bicep curls led to underestimations of heart rate peaks. The inability to connect an external chest strap further limits its utility for weightlifting enthusiasts.
Overall, the Pixel Watch 5’s heart rate tracking during exercise is rated as perfect to great, making it a reliable choice for most activities except weightlifting.
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Sleep Tracking: Solid Performance with Room for Improvement
The Pixel Watch 5 offers detailed sleep tracking, including heart rate monitoring, heart rate variability (HRV), and sleep stage detection. Here’s how it performed:
- Heart Rate Tracking During Sleep: The 45mm version showed excellent accuracy, with most data points aligning closely with the reference device. However, the 41mm version occasionally displayed unexplained spikes in heart rate, which Google is investigating.
- Heart Rate Variability (HRV): While the patterns were consistent with the reference device, the Pixel Watch 5 tended to overview slightly lower HRV values. This discrepancy could be due to differences in calculation methods.
- Sleep Stage Detection: The watch performed well in identifying deep sleep, light sleep and REM sleep stages. Deep sleep detection was particularly accurate, with an agreement rate of 88-91%. REM sleep detection was slightly less accurate, with a 64-65% agreement rate, but this is still competitive compared to other devices.
The Pixel Watch 5’s sleep tracking is rated as great, with particularly strong performance in deep sleep detection. However, occasional artifacts in heart rate data and slightly lower HRV values suggest room for refinement.
Battery Life and Practical Considerations
Battery life is a critical factor for any wearable and the Pixel Watch 5 presents a mixed picture. The 45mm version managed to last through a 10-hour hike with 7% battery remaining, while the 41mm version ran out of power after approximately 6 hours. This limitation makes the smaller version less suitable for extended outdoor activities. Daily charging is necessary for both models, which may be inconvenient for some users.
Comparison to Competitors
The Pixel Watch 5 holds its own against top competitors like Garmin, Fitbit and Apple. Its GPS tracking rivals Garmin’s best, while its heart rate tracking during exercise outperforms many devices in its class. Sleep tracking is on par with Fitbit and Apple, though the latter slightly edges out in REM sleep detection. The lack of external chest strap support and limited battery life are notable drawbacks, but these are outweighed by its overall performance and feature set.
Final Thoughts
The Pixel Watch 5 is a top-tier health and sports tracker, offering great accuracy in GPS, heart rate tracking and sleep monitoring. While it has some limitations, such as battery life and weightlifting performance, it remains a strong contender in the wearable market. If you’re looking for a reliable and feature-rich smartwatch, the Pixel Watch 5 is an excellent choice, especially for those who prioritize sports tracking and health insights.
For those interested in purchasing the Pixel Watch 5 or exploring alternatives like the Fitbit Air or Garmin Foreigner 970, consider using affiliate links to support further reviews and testing. The Pixel Watch 5 is a worthy investment for anyone seeking a high-performing, versatile smartwatch.
Media Credit: The Quantified Scientist
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