The accuracy of the Huawei Watch Ultimate in detecting different sleep stages is not explicitly detailed in the available information. However, we can infer its performance based on similar Huawei devices and the technology they use.
Huawei's sleep tracking technology, such as TruSleep 3.0, is designed to analyze sleep stages including deep sleep, light sleep, rapid eye movement (REM) sleep, and waking. This technology uses data from accelerometers (ACC) and photoplethysmography (PPG) to track motion features and heart rate fluctuations, which help in identifying sleep stages[7].
In reviews of other Huawei devices, such as the Huawei Watch 3 and Huawei Watch Fit, the accuracy of sleep stage detection has been mixed. For instance, the Huawei Watch 3 had issues with accurately detecting light sleep and REM sleep, often confusing them with other stages[1]. The Huawei Watch Fit was good at detecting sleep onset and offset but had difficulties accurately tracking individual sleep stages throughout the night, particularly overestimating deep sleep[4].
Given that the Huawei Watch Ultimate uses similar technology (TruSleep 3.0), it is likely to face similar challenges in accurately detecting different sleep stages. However, without specific data or studies on the Watch Ultimate, it's difficult to provide precise accuracy metrics. The watch does offer features like sleep scores and suggestions to improve sleep quality, which are part of Huawei's standard sleep tracking features[2][5].
Overall, while the Huawei Watch Ultimate is equipped with advanced health monitoring capabilities, its sleep stage detection accuracy may vary and could benefit from further scientific validation.
Citations:
[1] https://www.youtube.com/watch?v=wKYKeryoU-A
[2] https://www.phonearena.com/reviews/huawei-watch-ultimate-review_id5760
[3] https://www.youtube.com/watch?v=PvqRLG0K4SQ
[4] https://www.youtube.com/watch?v=V9whuHZ5zL4
[5] https://root-nation.com/en/gadgets-en/wearables-en/en-huawei-watch-ultimate-design-review/
[6] https://www.cpap.com/blogs/sleep-apnea/wearables-detect-sleep-apnea-apple-fitbit-garmin
[7] https://consumer.huawei.com/en/support/content/en-us15963854/
[8] https://www.gsmarena.com/huawei_watch_ultimate_review-news-58259.php
[9] https://consumer.huawei.com/en/support/content/en-us15759715/