Fig. 2

Visualization of synthesized physical activity samples with four types of disturbance. a Normally distributed disturbance with a standard deviation of 60 min was added to the occurrence time of exercise. b Normally distributed disturbance with a standard deviation of 60 min was added to the duration of exercise. c Normally distributed disturbance with a standard deviation of 50 step/minute was added to the intensity of exercise. d Trivial activities were added to daily exercise