Annu Int Conf IEEE Eng Med Biol Soc. 2022 Jul;2022:4308-4311. doi: 10.1109/EMBC48229.2022.9871629.
In this study, we investigated the effect of time shift in heartrate measurement by wearables, which might to be used in telehealth applications for patients suffering from heart failure. Six wearables commercially available on the market were tested in a 14-hour measurement. Each wearable was tested three times by five different test persons. A reference sensor was used to test the accuracy of the wearables. We found that different types of time shifts are common in the sensors we tested: time shifts of full days, time shifts of full hours (most probably due to incorrect or unspecified time zones) and time shifts in the range of seconds to minutes (most likely stemming from averaging, data transmission, etc.). We conclude that time shifts of all manufacturers need to be corrected prior comparison of a photoplethysmography signal with other signals. However, even after correction of the time shift, the reliability of the sensors seems to be too low for application in telehealth settings. Clinical relevance- This study shows that signals from state-of-the-art wearable photoplethysmography heart rate measurements show significant time shifts and marked differences even if time shifts were corrected. This limits their utility for clinical applications.
在这项研究中，我们调查了可穿戴设备在心率测量中的时间偏移的影响，这些设备可能用于心力衰竭患者的远程医疗应用。我们对市场上的六种可穿戴设备进行了 14 小时的测量。每个可穿戴设备由五名不同的测试人员测试了三次。使用参考传感器来测试可穿戴设备的准确性。我们发现，我们测试的传感器中存在不同类型的时间偏移：全天的时间偏移、整小时的时间偏移（最有可能是由于不正确或未指定的时区）以及秒到分钟范围的时间偏移（最有可能源自平均值、数据传输等）。我们得出结论，在将光电容积脉搏波信号与其他信号进行比较之前，所有制造商的时间偏移都需要进行校正。然而，即使校正了时间偏移，传感器的可靠性似乎也太低，无法在远程医疗环境中应用。临床相关性——本研究表明，即使校正了时间偏移，最先进的可穿戴光电容积脉搏波心率测量的信号也会显示出明显的时间偏移和显著的差异。这限制了它们在临床应用中的效用。
