摘要Impedance pneumography has a significant advantage for continuous and noninvasive monitoring of respiration,compared with conventional flowmeter-based ventilation measurement technologies.While thoracic impedance is sensitive to pulmonary ventilation,it is also sensitive to physiological activities such as blood flow and cardiomotility,in addition,body movement/posture.This paper explores the possibility of simultaneously monitoring pulmonary ventilation,blood circulation and cardiomotility by bioimpedance measurement.Respira-tory,blood perfusion and cardiomotility signals are extracted using the wavelet method from thoracic impedance data measured in breath-holding and tidal breathing statuses,to investigate signal strength and their depen-dency.This research provides a foundation for the development of bedside devices to monitor various physiological activities.