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To measure wrist-based heart rate accurately you need
to wear your M430 snugly on top of your wrist, just
behind the wrist bone (see the picture on the right). The
sensor on the back must be in constant touch with your
skin, but the wristband should not be too tight to prevent
blood flow. For most accurate heart rate measurement,
we advise you to wear your M430 for a few minutes prior
to starting the heart rate measurement.
If you have tattoos on the skin of your wrist, avoid placing the sensor right on it as it may prevent accurate
readings.
Also it's a good idea to warm up the skin if your hands and skin get cold easily. Get the blood going before
starting your session!
In sports where it's more challenging to keep the sensor stationary on your wrist or where you have pressure
or movement in muscles or tendons near the sensor, we recommend using a Polar heart rate sensor with a
chest strap to get a better measurement of your heart rate.
When you're recording a swimming session with your M430, water may prevent the wrist-based heart rate
measurement from working optimally. But the M430 will still collect your activity data from your wrist
movements when swimming. Note that you can't use a Polar heart rate sensor with a chest strap with the
M430 when swimming because Bluetooth doesn't work in water.
START A TRAINING SESSION
1. Wear your M430, and tighten the wristband.
2. In time view, press START to enter pre-training mode.
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