This can happen for the following reasons:
- A disruptive signal from the near vicinity is falsifying the measurement values
- A very irregular heart frequency is measured. Under certain circumstances, this can occur at the start of training and in a condition of exhaustion and will depend on the individual’s physical status.
In order to avoid incorrect information from the LED indicator / training zone alarm, these warning signals are stopped in such cases.
Please also note that the intervals for the training zone alarm and the LED indicator are different depending on the training zone selected.