Last Updated on September 26, 2022 by pg@petergamma.org
Jukka Happonen, Senior Specialist at Polar Electro Oy Research Center:
https://www.linkedin.com/in/jukka-happonen-aa354a1/?originalSubdomain=fi
- This application can be used to log HR and other raw biosignals from the Polar H10, OH1 and Verity Sense. It uses Polar SDK. to connect sensors. It has the following data:
Verity Sense:
– HR, PPi, Accelerometer, Gyro, Magnetometer and PPG
OH1:
– HR, PPi, Accelerometer and PPG
H10:
– HR, RR, ECG and Accelerometer
H7/H9:
– HR and RR
- The application also supports sensor data forwarding using MQTT-protocol and data sending to MQTT-broker
- This app was made by Jukka Happonen and it is not an official Polar app.
FAQ:
Q: What is the timestamp format?
A: Timestamp format is nanoseconds and the epoch is 1.1.2000.
Q: Why nanoseconds?
A: Ask from Polar 🙂
Q: What are the extra columns in HR data?
A: They are RR-intervals in milliseconds.
Q: Why there are sometimes 0-4 RR-intervals?
A: Bluetooth exchanges data around 1 s intervals and if your heart rate is around 60 bpm, then almost every RR-interval hits between data transmission. If you have heartrate eg. 40, then your RR-interval is over 1s => not every BLE packet contain RR-interval. Then if your heartrate is eg. 180, then there is at least two RR-intervals in BLE packet.
Q: What is the ECG sampling frequency?
A: It is around 130 Hz.
Q: What does ECG, ACC, PPG, PPI mean?
A: ECG = Electrocardiography (https://en.wikipedia.org/wiki/Electrocardiography), Acc = Accelerometer, PPG = Photoplethysmogram (https://en.wikipedia.org/wiki/Photoplethysmograph), PPI = Pulse-to-Pulse Interval
Q: What does “Marker”-button do?
A: Marker button will generate a marker file. Marker file will hold timestamps when the marker is started and stopped. You can use the marker to mark some events during the measurement.
- If you have more questions, please drop Jukka Happonen an e-mail
The Polar H10 chest strap offers more data HR, RR, ECG and Accelerometer data
The Polar H7 has only HR and RR, RR is required for resporatory rate estimation and therefore the Polar H7 sufficient for respiratory rate estimation
The Polar H7 has more validation papers than the Polar H10 (see this site and on Google Scolar). Some of these papers are more convincing and authored by a cardiologist, some of them are for us personally less convincing. The less convincing papers where comparison studies with ECG devices which resulted in low accuracy values of ECG devices during activity. We suspect ECG movement artifacts as an explanation of these result, but we did not study the papers in detail.