the contracting uterine muscle measured at the skin surface or recording both the fetal ECG and mother's ECG and filtering out the mother's ECG are emerging.

Wearable heart rate monitors for exercise

The new wearable heart rate monitors indirectly measure the heart rate with reflectance photoplethysmography. The monitor illuminates the skin tissue with light emitting diode (LED) and detects the intensity of light reflected with the photodetector. Wearable optical heart rate monitors are less reliable than electrode-based heart

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