Nowadays, as long as digital products are "smart", they always feel that their value will soar, for fear that people may not know that they are a product that can change their lives. However, even though so many products are full of our eyes, the only one that really makes Xiaobian attractive is the smart bracelet. Whenever I see many people wearing sports bracelets when running, it is necessary to think about it carefully. Looking at many products, a real sports bracelet must have a heart rate.
Before the Double 11, Xiaomi quietly released a new generation of Xiaomi bracelet products - Xiaomi bracelet optical version. It can be seen from the name that this new product is not a great leap forward, just the addition of heart rate function, so in terms of overall appearance, it is almost the same as the previous generation Xiaomi bracelet. Due to the addition of heart rate, the thickness increased by 0.9mm and the weight increased by 0.5g. Xiaomi still uses the price war. The price is only 99 yuan. I believe many friends' first reaction is that it is so cheap. Is it reliable and worth buying. However, with the increase of heart rate monitoring function, the official data of the Xiaomi bracelet generation is 30 days, and the light sensing version is only about 10 days. Under the condition of infrequent monitoring of heart rate, it can be maintained for about a week. In terms of waterproof, it supports IP67 waterproof, which can meet the daily waterproof requirements.
What's the use of heart rate bracelet?
First of all, we need to know why the smart bracelet has a heart rate. The heart rate of normal people is generally between 70 and 90/minute, but after a long run, the heart function improves, At this time, the resting heart rate suddenly rises. If you do not observe the heart rate change at any time and make it too high, there is a great chance that it will be overtired or over trained, or even sudden death.
On the other hand, if the heart rate cannot reach a certain height, no more effort will improve the function of oneself. At this time, you need heart rate assistance to trim the exercise data, and combine your heart rate fluctuation curve to accurately record your exercise, not just the steps. Otherwise, the bracelet is always a simple step counting tool, and can never be called a real sports bracelet. Therefore, not only Xiaomi, but also companies like Jawbone and Fitbitzhe that started with bracelets, why don't they give up the function of heart rate. The problem of why heart rate is standard for exercise bracelets is solved.
Is Xiaomi's heart rate accurate?
In general, monitor Heart rate is usually divided into three methods: photoelectric transmission measurement, ECG signal testing, and vibration measurement. In principle, the three are quite different. ECG signal measures myocardial contraction, and its principle is similar to that of ECG. Its disadvantage is that it is vulnerable to electromagnetic interference, and the sensor must be close to the skin, which is a fatal problem for sports wear. Vibratory measurement captures the body vibration caused by heartbeat through high-precision sensors, which is not worn when exercising. Then there is only the photoelectric transmission measurement method. Therefore, the light sensing version of the Xiaomi bracelet is based on this principle.
The Xiaomi bracelet light sensor will emit green light when measuring the heart rate, about 4 or 5 seconds. This green beam is reflected/transmitted, and because the light of a specific wavelength is absorbed by the blood, the heartbeat can be determined. However, this method is easily interfered by the external environment. For individuals, the importance of heart rate monitoring with a bracelet is that it can be continuously monitored. Even if the absolute value is inaccurate, some value can be found in the analysis of relative change trend.
Having said so much, the light sensitive version of the Xiaomi bracelet is actually a more practical product, which may not be useful for people who do not like sports. In fact, this product still has some functions that need to be improved. For example, it can't look at the time, and its shape is still the traditional "Xiaomi family style". With the addition of heart rate monitoring, the 41mAh battery is still used, which is obviously a little small. Maybe "Xiaomi Bracelet 2" will really solve this problem. So if you really want to discuss whether it is worth buying or not, I think that if you simply want to experience, or want to monitor your physical function during exercise, for the price of 99 yuan, it is still worth starting.
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