Fig. 3From: Sleep postures monitoring based on capacitively coupled electrodes and deep recurrent neural networksECG vector projection onto the three limb leads (leads I, II and III) (a) and the cECG of three sleep postures (b) [36]. The ring-shaped dotted line represents the ECG vector during ventricular depolarization. Three sleep postures include supine, left lateral and right lateralBack to article page