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 measurement by smartwatches and apps, emphasizing that the heart rate variability (HRV) used to gauge stress does not solely reflect psychological pressure but also includes various physiological factors [19][32][52]. Group 1: Measurement Methodology - Smartwatches typically measure stress through heart rate variability (HRV), which indicates the variation in time between heartbeats [19][30]. - A healthy heart rate shows variability, while a consistent rhythm indicates lower HRV, suggesting higher stress levels [20][28]. - The autonomic nervous system, comprising the sympathetic (SNS) and parasympathetic (PNS) systems, regulates heart rate and can influence HRV based on various stimuli [22][25]. Group 2: Factors Affecting HRV - Both psychological and physiological stressors can lower HRV, including caffeine intake, smoking, intense exercise, and emotional excitement [34][35][42]. - The smartwatch cannot differentiate between types of stress, leading to potential misinterpretations of the user's actual stress state [44][52]. Group 3: Research Findings - A study involving 781 students found a significant mismatch between smartwatch-measured stress and self-reported stress levels, indicating that wearable device data may not accurately reflect user experiences [46][49]. - The research concluded that wearable device data and self-reported data might represent different concepts, highlighting the limitations of current stress measurement technologies [50][51]. Group 4: User Perception and Misunderstanding - Many users may misinterpret the capabilities of stress-monitoring apps, believing they can accurately assess psychological pressure when they primarily reflect physiological load [56][62]. - The article suggests that while these apps can provide some value, they should not be relied upon for precise psychological assessments [59][65].