Objective: To explore the mediating role of over-commitment in the relationship between occupational stressors and job burnout, and to offer more specificevidence-based information in exploring the work related health effects of over-commitment. Methods: A total of 1994 samples from electronic manufacturing service industry were collected in Guangdong province based on self-rated questionnaire after written consent from June to July, 2015. The Effort-Reward Imbalance questionnaire and Maslach Burnout Invertory-General Survey were used for the measurement of occupational stress and job burnout. And hierarchical regression and Bootstrap test were conducted for data analysis. Results: High effort (0.28, 0.24-0.33) and low reward (-0.37, -0.42--0.33) were significantly associated with high over-commitment when gender, age and position had been controlled. Standardizedregression coefficient of effort to emotional exhaustion, depersonalization and personal accomplishment were 0.63 (95%CI: 0.54-0.71) 、0.18 (95%CI: 0.10-0.26) 、0.32 (95%CI: 0.21-0.43) , P<0.05; and standardized regression coefficient of reward to emotional exhaustion, depersonalization and personal accomplishment were-0.60 (95%CI: -0.68--0.52) 、-0.93 (95%CI: -1.01--0.86) 、-0.46 (95%CI: -0.35--0.58) , P<0.05. Bootstrap test indicated the mediation of over-commitment were statistically significant, and mediating effect ranges from 0.093 to 0.218 (P<0.05) . Conclusion Over-commitment can mediate the relationship between occupational stressors (job effort and reward) and burnout, and the effect varies from different workingconditions.

Objective To investigate the effect of group cognitive behavioral therapy on anxiety and depression in patients with chronic heart failure ( CHF ) .Methods One hundred patients with CHF were recruited from January 2012 to December 2013 in cardiovascular department , and were divided into the intervention group and the control group , with 50 patients each .Comprehensive intervention including routine heart failure care and group cognitive behavioral therapy combined with other therapies was adopted on the patients in the intervention group .The Self-rating Anxiety Scale ( SAS ) and the Self-rating Depression Scale ( SDS) were used to compare the difference of anxiety and depression between groups .Results At the baseline, the incidence of anxiety was 25%, within which 11 patients had mild anxiety , and 10 patients had moderate anxiety, and 4 patients had severe anxiety.The incidence of depression was 39%, within which 19 patients had mild depression , and 14 patients had moderate depression , and 6 patients had severe depression .The score of SAS and SDS in the intervention group after intervention were (36.90 ±8.465) and (27.53 ±7.162), respectively, which were significantly lower than (40.91 ±8.019) and (36.78 ±10.562) in the control group (t=9.244,10.335, respectively;P<0.01).Conclusions Group cognitive behavioral therapy can effectively relieve the anxiety and depression in patients with chronic heart failure .