Xiaomi's Mi Fit app and Mi Band fitness trackers did not include a dedicated feature to directly measure stress levels. However, things might have changed in newer versions or updates, so it's essential to check the latest features and capabilities of the Mi Fit Bit and Mi Fit app to see if stress measurement has been added.
Typically, dedicated stress measurement on fitness trackers and smartwatches involves the use of heart rate variability (HRV) analysis. HRV is the variation in time between successive heartbeats, which can provide insights into the body's autonomic nervous system (ANS). The ANS controls involuntary bodily functions, including the stress response.
The general principle behind HRV-based stress measurement is that when someone is stressed, the balance between the sympathetic nervous system (responsible for the fight-or-flight response) and the parasympathetic nervous system (responsible for relaxation and recovery) changes. Higher stress levels are often associated with decreased HRV, while lower stress levels are linked to increased HRV.
Fitness trackers with HRV sensors can analyze the heart rate data collected during rest or low-intensity activities to estimate stress levels. The device may prompt the user to take a brief breathing exercise to help calibrate the HRV baseline before making stress level estimations.
It's important to note that while HRV-based stress measurement can provide useful insights, it is not a medical-grade or definitive measure of stress. Stress is a complex psychological and physiological state, and various factors can influence it beyond HRV alone.
If stress measurement is a critical feature for you, it's worth checking the specifications and features of the latest version of the Mi Fit Bit and the Mi Fit app or exploring other fitness trackers or smartwatches that offer dedicated stress monitoring capabilities. Always make sure to rely on the most recent information and reviews when evaluating the capabilities of specific devices.