手表的压力测试其实是骗你的，准确率约等于算命

Core Viewpoint - The article discusses the inaccuracies of stress monitoring by smartwatches and apps, emphasizing that the data they provide may not accurately reflect users' psychological stress levels [6][55]. Group 1: User Experiences - Many users have reported discrepancies between their perceived stress levels and the readings from their smartwatches, indicating that the devices may not be reliable [9][54]. - Instances include users feeling relaxed but receiving notifications of high stress, suggesting that the devices may misinterpret physiological signals [13][46]. Group 2: Measurement Methodology - Smartwatches typically measure stress through heart rate variability (HRV), which reflects the variation in time between heartbeats rather than the heart rate itself [19][35]. - A healthy heart rate shows variability, while a low HRV indicates stress, but this does not differentiate between psychological and physiological stressors [30][47]. Group 3: Physiological vs. Psychological Stress - Various factors, such as caffeine intake, exercise, and emotional excitement, can lower HRV, leading to misleading stress readings from smartwatches [39][45]. - The article highlights that physiological stress can trigger the same responses as psychological stress, complicating the interpretation of HRV data [38][46]. Group 4: Limitations of Wearable Technology - The article points out that wearable devices often lack the capability to provide a nuanced understanding of stress, as they primarily focus on HRV without considering other factors [58][60]. - Clinical assessments of psychological stress involve a multi-dimensional evaluation, which smartwatches do not provide [57][75]. Group 5: User Misunderstanding and Marketing - There is a concern that marketing for stress-monitoring apps may mislead users into believing that these devices can accurately measure psychological stress [63][64]. - While these apps can provide some insights into overall physiological load, they should not be relied upon for precise psychological assessments [70][74].