physical activity human 13 Humans 12 male 11 Article 10 adult 10 female 10 human experiment 6 exercise 5 normal human 5 Adult 4 Exercise 4 Male 4 Physical activity 4 Walking 4 Wrist 4 algorithm 4 controlled study 4 electroencephalography 4 major clinical study 4 signal noise ratio 4 walking 4 wrist 4 Energy expenditure 3 Female 3 Machine learning models 3 Wearable Electronic Devices 3 Wearable sensors 3 acceleration 3 accelerometer 3