Article 2 Electrocardiography 2 Humans 2 Wearable Electronic Devices 2 Wearable sensors 2 adult 2 breathing 2 electrocardiogram 2 electrocardiography 2 electroencephalography 2 electronic device female 2 human 2 human experiment 2 machine learning male 2 mathematical model 2 nerve cell network 2 normal human 2 physical activity 2 signal noise ratio 2 signal processing 2 Accurate estimation 1 Asthma 1 Atmospheric pressure 1 Biomarkers 1 Breathing rate 1 COSMED K5 1 Classification (of information) 1 Classification regression 1