EEG Recording The one-channel EEG sensor was recorded from Cz with linked-ear reference based on the International 10-20 system. EEG signals were recorded using BioGraph Infiniti software (Version 6.0.4, n.d.) with a band-pass between 1-30 Hz. The sample rate was 256 Hz with 60-Hz notch filters, and the electrode impedances were lower than 5 kΩ.

A lead II electrocardiogram (ECG) was collected for 5 minutes at baseline using the ProComp InfinitiTM system (Thought Technology Ltd., Montreal, Canada), which was installed on a laptop. A sampling rate of 2,048/second was set in order to acquire real-time interbeat intervals.

The aim of this study was to explore the abused PW nurses who receiving bio-feedback training as an intervention improve, and change of physiological indicators before and after intervention (3 months later), which included Respiratory Rate (RR), skin conduction (SC), heart rate variability (HRV), and resilience.

The Chinese version Center for Epidemiologic Studies Depression was developed with a Cronbach's alpha of 0_86, and it was used as the screening measure of depressive tendency in this study. The cut-off point of the scale is of greater than or equal to 15 on the CES-D score.

The Resilience Scale was developed by Friborg et al. (2006) and the Chinese version was established by Wang and Chen with satisfactory validity and reliability. The 29-item scale measures intrapersonal and interpersonal protective resources that may facilitate an individual's adaptability to and tolerance for stress and adverse life events. The scale comprises five components, including personal strength, social competence, structured style, family cohesion, and social resources. The total scores of the RS range from 29 to 203, with higher scores indicating a higher level of resilience.

The one-channel EEG sensor was recorded from Cz with linked-ear reference based on the International 10-20 system. EEG signals were recorded using BioGraph Infiniti software (Version 6.0.4, n.d.) with a band-pass between 1-30 Hz.