Sports bracelet with a loose band can be measured premature boobs

No. Sports bracelets usually monitor heart rate through a photoelectric heart rate sensor, and this sensor needs to be close to the skin in order to accurately read heart rate data. A loose bracelet band will result in a poor contact between the sensor and the skin, thus affecting the heart rate measurement not to come out. The main function of the sports bracelet is to monitor sports and health data, not a medical device, so its monitoring of heart diseases such as premature beats is not accurate and reliable enough.