Table 1.

Key Application Programming Interfaces

registerDataListener(callback(data), data_type, update_interval)

* data_type=RAW_DATA | HR | HRV

* update_interval

- The unit of millisecond (larger than 50 ms) for RAW_DATA,

- The unit of second for HR,

- 1 | 2 | 5 minutes for HRV

class RAW_DATA { long timestamp; double [] raw_data; }

class HR { long timestamp; int HR; }

class HRV{ long timestamp; float LF; float HF; float LF/HF;…};

HR, heart rate; HRV, heart rate variability; HF, high frequency; LF, low frequency.