How to calculate the vitality value of mi band?

According to the daily steps, heart rate, sleep and other data, the comprehensive health score is given. According to the product introduction of Xiaomi Technology Co., Ltd. in official website, we know that the eighth generation of its bracelet products supports vitality value for the first time. According to the daily steps, heart rate, sleep and other data, the comprehensive health score is given for calculation as a reference for users to make exercise plans to avoid excessive or insufficient exercise.