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Using GPS and measuring heart rate when swimming

Measuring heart rate is possible in all the swimming sport profiles (Swimming, Pool swimming and Open water swimming). In all of these profiles heart rate is measured via GymLink (5 kHz transmission) as Bluetooth® Smart is disabled. However, open water swimming is the only profile in which measuring heart rate and using GPS at the same time is possible. This is not possible in the swimming or pool swimming profiles as GPS is not available in them.

Please note that GPS can interfere with GymLink transmission, and therefore heart rate data can be imprecise when using GPS and recording heart rate in a swimming session.  Additionally, when measuring heart rate in water, you may experience interference because:

  • The ECG signal strength is individual and may vary depending on the individual’s tissue composition. Problems occur more frequently when measuring heart rate in water.
  • Pool water with high chlorine content and seawater are very conductive. Sensor electrodes can short-circuit in these conditions preventing ECG signal detection.
  • Jumping into water or strenuous muscle movement during competitive swimming may shift the sensor on your body where ECG signals aren't detected.

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