Philips DL879X, User Manual, Page: 14 / 92

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feeling that your heart is beating too hard or fast,
-
having shortness of breath during rest/mild exertion, when lying flat or during
the night,
-
having a known heart murmur,
-
having swollen ankles.
Exercising while experiencing any of these symptoms might increase the risk of heart
problems.
- It is important to always listen to your body first, instead of only relying upon
measurements that the watch provides.
-
If you are taking
medicines
that lower your maximum heart rate (e.g. for high blood
pressure), consult your doctor. Ask your doctor what your target heart rate zone should be.