Nike smart bracelets have been settled in the case of inaccurate motion monitoring, but this does not seem to close the distance between the good expectations of wearables and the reality of bones. Even some consumers choose to “give up†after purchasing for a week or two, expressing dissatisfaction with some wearable devices in an extreme way.
When we are worried about the industry, we have to accept the objective reality that there are currently few wearable devices that are truly qualified products. Of course, we should also look more calmly at the existing product technology level and report rational optimism about the development of the industry. I believe that the difficulty of starting does not affect its status as an IoT carrier.
Whose heart rate monitoring is accurate?
Looking at the entire field of wearable devices, we can see that almost every wearable device is equipped with functions for recording various data related to the human body, such as sleep, heart rate, exercise volume, etc. It seems that if this function is missing, it cannot be Be honest with the title of "wearable device." Moreover, it is also a feature that currently supports most wearable devices in the market. Of course, this is understandable, because wearable devices without data have no value. So the question is, with data wearable devices, are their data accurate? Do consumers believe that their data is accurate?
Let's look at a set of experiments first. Taking the smart device with heart rate monitoring function on the market as an example, Shanet Profis of CNET selected Garmin VivoFit, Basis Carbon Steel, Withings Pulse O2 with the help of cardiologist Dr. Jon Zaroff. The Samsung Gear Fit and Samsung's Galaxy S5 with fingertip sensors were tested as three stationary and three motion tests.
The results show that under static conditions, the data of the five wearable devices are relatively accurate, and the error rate is controlled at about 10%. However, in the motion state, in addition to the amazing performance of Garmin VivoFit and Galaxy S5, the other devices have appeared. A large degree of error.
Errors in heart rate monitoring of five smart bracelets
How did the measurement result come about? This has to start with the principles of wearable devices and specialized medical devices : ECG machines or chest-belt heart rate monitors used in professional medical environments use electrode-type heart rate sensors, which are often complicated and bulky to operate. On smaller wearable devices. At present, most of the sensors carried on the mobile device side are photoelectric heart rate sensors measured by light reflection, that is, the LEDs are illuminated by LEDs to monitor the blood flow velocity to obtain BPM (heartbeats per minute). If you want to obtain more accurate monitoring data, the photoelectric heart rate sensor often has a very high requirement for the actual monitoring environment, that is, the user can't talk, can't move, and can't sweat. Therefore, in the sports environment, the error probability will be relatively large.
The Garmin VivoFit and Galaxy S5 maintain relatively accurate data records during exercise. The former is because it is a chest strap heart rate sensor. The technical principle is similar to that of an ECG machine, although the latter is in principle identical to the bracelet, but different. It is the position measured by the mobile phone at the fingertip. Since there is an arterial blood vessel at the fingertip of the index finger, it can basically maintain the same frequency as the heart.
Photoelectric heart rate sensor on Samsung S5 mobile phone
We can conclude from this experiment that if you want to get accurate heart rate data in the state of exercise, the wearing position of the wearable device is very important, that is, either near the heart or near the fingertips, anyway, it can't be The wrist is the right place, so this will negate the accuracy of heart rate monitoring for all current smart bracelets and watch products. Of course, some domestic manufacturers of medical device products have a deeper understanding of this technology. For example, the wearable device of Li'an Health Butler, produced by Beijing Li'an Shenghua Technology Co., Ltd., uses the monitoring technology of fingertip arteries. Achieve monitoring of heart rate.
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