Precautions, Interference During Exercise

7. PRECAUTIONS

7.1 INTERFERENCE DURING EXERCISE

Electromagnetic Interference

Interference may occur near high voltage power lines, trafﬁc lights, overhead lines of electric railways, electric bus lines or trams, televisions, car motors, bike computers, some motor-driven exercise equipment, cell phones or when you walk through electric security gates.

Exercise Equipment

Several pieces of exercise equipment with electronic or electrical components such as LED displays, motors, and electric brakes may cause interference with stray signals. To try to solve the problem, relocate your wrist unit as follows:

1.Remove the transmitter from your chest and use the exercise equipment as you would normally.

2.Move the wrist unit around until you ﬁnd an area where it displays no stray reading or the heart symbol does not ﬂash. Interference is often worst right in front of the display panel of the equipment, while the left or right side of the display is relatively free from interference.

3.Put the transmitter back on your chest and keep your wrist unit in this interference-free zone as much as possible.

4.If the Polar heart rate monitor still does not work with the exercise equipment, this piece of equipment may be electrically too noisy for wireless heart rate measurement.

Crosstalk

The Polar wrist unit in non-coded mode of operation picks up transmitter signals within 3 feet/1 meter. Simultaneous non-coded signals from more than one transmitter can cause incorrect readings.

Using Your Polar Heart Rate Monitor in Water

Your Polar heart rate monitor is water resistant and can be used when swimming. To maintain the water resistance, do not press the button of the wrist unit under water.

Users measuring their heart rate in water may experience interference for the following reasons:

•Pool water with a high chlorine content and seawater are very conductive. The electrodes of a transmitter may short-circuit, which prevents ECG signals from being detected by the transmitter.

•Jumping into water or strenuous muscle movement during competitive swimming may cause water resistance that shifts the transmitter on the body to a location where it is not possible to pick up an ECG signal.

•ECG signal strength is individual and also varies depending on an individual’s tissue composition. The percentage of people who have difﬁculties with heart rate measurement is considerably higher in water than in other use.