Philips DL8790 User Manual page 41

Important: Do not try to estimate your HRR if you are not very active or unaccustomed
to high intensity activity. To reduce the chance of injury during exercise please
read the information and follow the general recommendations (see ‚GENERAL
RECOMMENDATIONS').
Heart rate measurement
Optical heart rate measurement has been shown to provide valid estimates of heart rate
for most people under most normal conditions. However, for accurate measurement it is
reliant on three key factors:
- Placement of the sensor in direct contact with the skin.
- Transmittance of light through the skin.
- Sufficient blood flow through the skin.
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