Is it really reliable to detect sleep with a smart bracelet? Many friends want to know whether it is accurate to detect sleep with smart bracelets. I will bring you the evaluation of smart bracelet to detect sleep, so that you can better understand the principle of smart bracelet to detect sleep. I believe many friends will be interested. Let's have a look.
1, basic principle
At present, many smart bracelets detect the motion state of our human body through the "body motion recorder"
What is a "body motion recorder"? How is it tested? Let's take a closer look.
"Physiology" is an instrument or sensor that detects human activities. By detecting all aspects of our movement data, we can fuse and calculate all kinds of sleep data [1].
Generally including a three-axis sensor.
When we are in a deep sleep, our muscles are in a relaxed state, and the whole body will not produce much exercise. When we are in a light sleep, our bodies will make small movements.
With the above detection state, we can roughly judge some estimated values with the corresponding sensor data and corresponding algorithm, and then we can get our body posture data at this time through multiple fitting.
2. Is the data accurate or not
Generally, our sleep depth can be divided into three stages: falling asleep, shallow sleep and deep sleep. Among them, deep sleep only accounts for about 1/4 of the whole sleep time, but only this 1/4 time is the prime time for our sleep. At this time, our brain will be at rest, our body will hardly move, and our muscles will relax.
All kinds of sleep data detected by the smart bracelet are collected by sensors and finally calculated by algorithms. There will be some differences between different bracelets and hardware, because we have to face it objectively.
3. Which bracelet data is more accurate?
As an intelligent product, there are certain errors in the data detected by itself, and each bracelet has certain errors and inaccuracies.
At present, there are two sets of standards, namely
PSG (polysomnography): According to the signals of chest and abdomen movements, brain waves, electromyography and eye electricity, sleep is divided into stages, which is adopted by general hospitals.
CPC (cardiopulmonary coupling) (cardiopulmonary coupling technology) medical grade
Huawei bracelet is relatively more accurate in this respect. The algorithm is based on TruSleep sleep detection algorithm and CPC technology, and has high credibility.
Mi band's measurement of deep sleep is not very accurate.
Everyone has different sleep habits. Deep sleep is judged according to the bracelet sensor, and the bracelet sensor can't sense the movement, thus judging that the user has entered deep sleep, but some users move more during deep sleep.
If you sleep long enough during the day, the bracelet will record it and take a nap for half an hour. Bracelets generally don't think you're sleeping. When I woke up in the morning, I fell asleep last night, but there were hundreds of steps recorded on the exercise meter. In fact, it is very likely that I fell asleep at night and made a record with my swing arm and bracelet.
At present, the sleep analysis of mi band is ok. I believe that it will be more accurate through continuous optimization, and the accuracy of sleep analysis will be improved.
The principle of smart bracelet sleep monitoring;
1. For the smart bracelet, an acceleration sensor and a low-power Bluetooth module are built in. The acceleration sensor can record the user's motion state. Through the height and weight provided by the user, we can get our motion data and energy consumption through software algorithms, and then connect with the mobile phone through Bluetooth, and collect the data into the matching mobile phone APP, and finally present the results.
2. Sleep monitoring is also recorded by sensor induction. When we sleep, we are usually in a static state, but when we turn over and move, sensors can record these changes, and then we can calculate our total sleep duration and sleep quality through software algorithms.
Nowadays, people go to bed later and later. Is it reliable to monitor sleep with smart bracelets?
For most young friends, with the increasing pressure of work and life, sleep time is getting late, so they will monitor their sleep through various smart bracelets. However, according to experts, this smart bracelet monitoring is not very reliable, and its credibility is not high, because this smart bracelet is used to estimate the four periods of sleep. In other words, different periods of sleep will lead to different things to be monitored, and smart bracelets can monitor very few things.
As we all know, everyone's sleep time is different. Some people may be in a light sleep state all night, but some people will go into a deep sleep. Then the data monitored by these two people are different. This smart bracelet must make everyone stay in bed for a long time. Even if they open their eyes, they will still be judged as sleep mode by the smart bracelet. So the transmitted data can only reflect a general situation. If you want to know more about your body, you still have to go to the hospital for a comprehensive examination.
Although many advanced things are installed in the smart bracelet, such as various skin temperature sensors and biosensors, it can record everyone's body temperature and heart rate. However, this bracelet does not have the function of monitoring brain waves and eye movements, so its agility and reliability are not convincing to everyone. Therefore, if you are a patient with sleep disorder, you should go to the hospital for a detailed test. After all, the hospital equipment is very advanced, and the data transmitted by this equipment is very reliable.
In fact, in Bian Xiao's view, there is no corresponding difference between this smart bracelet and the way it moves on the mobile phone. If you want to test your sleep, you can also turn on the software that comes with your mobile phone, which can also play a monitoring role. However, everyone should understand that there is no smart bracelet in the world that can completely transmit their own body data, so we still need to have a clear head in this respect.
Is the sleep monitoring bracelet useful?
In fact, the smart bracelet in our market is the principle of using the induction system to sense a state of human hands, thus inferring the state of sleep. When entering sleep, if the wearer's body is active, the bracelet defaults to light sleep, and if the body is inactive, it is considered to be deep sleep.
Relevant experts also mentioned that such monitoring data is unscientific and can only be inferred. This kind of bracelet can be used as a tool, including watching time, sleeping time and so on. However, if more accurate data is needed, hospitals usually use polysomnography to monitor people's brain waves and breathing during sleep. Nowadays, with the development of science and technology, household precision products emerge one after another. Like polysomnography, Youmengsi sleep cat's eye is monitored by brain waves. Only 5.2g products contain "great energy", which can be searched by JD.COM Tmall.