At present, the principle of smart wristband blood pressure sleep monitoring is: analyzing the sleep state through a body motion recorder. Simply put, there is a sensor on the smart bracelet that measures the quality of sleep based on the magnitude and frequency of the wrist movement during sleep.
(Note: The body motion recorder can detect small movements to determine whether it is in awake, shallow sleep or deep sleep. As for how to determine the user's state, it depends on the preset parameters of the bracelet, the bracelet will be pre- Several trigger conditions are set to determine whether the user enters the sleep state. When the monitoring data of the bracelet matches the preset data, the bracelet will determine that the user has entered the corresponding mode.
The body motion recorder is mentioned here to detect small movements to determine if I am awake, shallow sleep or deep sleep.
Then, next, how to use the body movement to determine whether it is in shallow and deep sleep. I got the following message: The depth of sleep is generally measured by the decrease in physical activity and the decrease in sensory sensitivity. At present, accurate measurement of sleep depth is still difficult.
The sleep monitoring is to monitor the movement of the person through the sensor, and the cumulative calculation is performed by the system calculation method, and the total value is recorded every 2 minutes, and the posture data at the same time is recorded. The sleep state is judged by calculation. Deep sleep only accounts for 25% of sleep time, also known as "golden sleep." Only in the mid-sleep period, deep sleep period and rapid eye movement sleep period of deep sleep state, it has a great effect on contact fatigue. (In addition to these periods, there are still shallow sleep, light sleep period, about 55% of sleep time) generally can judge deep sleep through REM and pulse, and REM has started rapid eye movement, the previous period should be Also in deep sleep state, the body motion recorder is a monitoring system developed in recent years, which can perform continuous sleep-wake state monitoring without affecting daily life. As a new auxiliary inspection method, body motion recording The instrument has been widely used in many aspects of clinical work, including the diagnosis of different forms of sleep disorders such as insomnia, periodic leg movement, sleep apnea syndrome, evaluation of treatment effect, evaluation of sleep patterns in special populations. Wait.
How to judge the stage of sleep?
The sleep monitoring monitors the movement of the person through the body motion recorder, and performs the cumulative calculation in the system calculation mode. The total value is recorded every 2 minutes, and the posture data at the same time is recorded, and the sleep state is judged by calculation.
When you are deeply asleep, your muscles will relax, and your limbs will not produce large movements or even movements. When you sleep lightly, your body will produce some slight movement.
The principle of the smart bracelet M4 is to monitor the state of the wrist and slowly change from the light motion mode to the immobile state at night to judge that it is in a state of deep sleep. Here, the calculation engine is used, and then according to each person's sleep cycle. The deep sleep time is calculated by judging the end and start of each sleep cycle.