Abnormal Heart Rate Readings During Exercise
- Moisten the electrode areas of the heart rate sensor. At the beginning of the exercise session your skin may be dry and the moisture will help ensure better contact. When you start to sweat the contact will improve because the salt in the sweat conducts the electrical signals very well. If your elastic strap has plastic electrodes, saliva is a good conductor as well. If the strap has textile electrodes, it is essential that you moisten them thoroughly under the tap water before exercise.
- Tighten the elastic strap. If the strap is loose, the movement of the electrodes will disturb ECG signal detection. If the standard-size strap does not fit satisfactorily, larger and smaller straps are available as accessories.
- Try different sensor positions to find the best for you. If the signal is weak when the sensor is placed right under pectorals (recommended position), move the sensor left or right, lower or higher to find the best signal. There are known cases where heart rate is detected better when sensor it is turned Polar logo upside down and facing out, or even when attached on the back.
- In demanding cases, if your strap has plastic electrodes, use conductive electrode lotion or gel to improve the contact. After using lotion or gel, it is very important to wash the heart rate sensor carefully. If your strap has textile electrodes, do not use conductive lotion or gel as it can block the electrode areas.
- Try shaving a small area on your chest. Hairy chest may weaken contact. If you cannot find your heart rate signal by positioning sensor differently or with using conductive gel (only for plastic electrodes), shaving a small area for better conductivity may help.
To ensure good heart rate signal detection, keep the heart rate sensor clean. Proper care of the heart rate sensor after every use ensures longer sensor life.
Wash the heart rate sensor after every use and make sure you store it according to instructions. For detailed, product-specific instructions, see Maintenance of Heart Rate Sensor with Textile Strap or T31/T31C Transmitter Maintenance or the product user manual.
- high-voltage power lines
- overhead lines of electric railways
- electric bus or tram lines, televisions
- traffic lights
- car motors
- bike computers
- cellular phones
- mp3 players
- electric security gates
- microwave ovens (H2, H3, WearLink Hybrid, WearLink W.I.N.D. which use W.I.N.D. transmission)
- computers (H2, H3, WearLink Hybrid, WearLink W.I.N.D. which use W.I.N.D. transmission)
- WLAN base stations (H2, H3, WearLink Hybrid, WearLink W.I.N.D. which use W.I.N.D. transmission)
- exercise equipment with electronic components. See troubleshoot here.
5. The distance between the training computer and the heart rate sensor with GymLink transmission is too long
- When using non-coded heart rate sensor (Polar T31), your training computer can pick up the heart rate signal from any other Polar heart rate sensor (using GymLink) within the 1 meter/ 3 feet range. This can happen even if the other heart rate sensor's transmission is coded. This crosstalk is seen as inaccurate readings on your training computer. To avoid signal crosstalk, keep 1 meter/ 3 feet distance to other sensors.
- When using a coded heart rate sensor (H1, H2, H7, H9, H10, T31C, WearLink, WearLink Hybrid and WearLink Nike+, pay special attention at the beginning of the exercise to be outside the 1 meter/ 3 feet range from other coded Polar heart rate sensors. Your training computer codes the heart rate signal at the start of every exercise. If other signals are available at the time, the coding may lock onto another person's signal rather than yours. To ensure succesful heart rate measurement, start your training session away from other training computer users.
- Moisten the electrodes before use or, if your strap has plastic electrodes, you can use conductive lotion or gel.
- Use a cotton shirt instead of a synthetic shirt.
- Use a tighter shirt to avoid fluttering of the material.
- Use the heart rate sensor on a wet shirt.
- Try placing the heart rate sensor slightly to the left.
If the battery of the heart rate sensor is running low, the transmission range decreases and may cause errors similar to the ones listed above in this document. For more information, see Battery Empty in the Polar Heart Rate Sensor.