BackgroundWith the rapid development of the networking technologies， internet addiction has increasingly become a serious mental health issue. Previous studies have revealed the link between childhood trauma and internet addiction， while the mediating role of perceived stress in this link is not yet clear. ObjectiveTo investigate the role of medical students' perceived stress in the relationship between childhood trauma and internet addiction， so as to provide references for the intervention of internet addiction. MethodsFrom February to March 2023， a random sampling technique was used to select 1 232 undergraduate students from the School of Clinical Medical Sciences of Southwest Medical University as research subjects. The Childhood Trauma Questionnaire-Short Form （CTQ-SF）， Perceived Stress Scale （PSS）， Internet Gaming Disorder Scale （IGDS）， and Bergen Social Media Addiction Scale （BSMAS） were used for assessment. Pearson's correlation coefficients were calculated. The mediation effect of perceived stress in the relationship between childhood trauma and internet addiction was tested using Model 4 in the SPSS Process 4.1， and Bootstrapping procedure involving 5 000 replicates was employed to confirm the statistical significance. ResultsA total of 1 016 （82.47%） valid completed questionnaires were gathered. The CTQ-SF scores of medical students were positively correlated with PSS scores， IGD scores， and BSMAS scores （r=0.583， 0.474， 0.465， P<0.01）. PSS scores were positively correlated with IGD scores and BSMAS scores （r=0.369， 0.479， P<0.01）. Childhood trauma in medical students was found to positively predict perceived stress （β=0.191， P<0.01）， social media addiction （β=0.160， P<0.01）， and internet gaming disorder （β=0.106， P<0.01）. Perceived stress played a significant mediating role in the relationship between childhood trauma and internet gaming disorder， indirect effect value was 0.018 （95% CI： 0.009~0.027）， accounting for 16.98%. Perceived stress also exhibited a significant mediating role in the relationship between childhood trauma and social media addiction， indirect effect value was 0.063 （95% CI： 0.048~0.079）， accounting for 39.38%. ConclusionChildhood trauma in medical students may affect internet gaming disorder and social media addiction through perceived stress. ［Funded by 2022 Annual Research Project of Sichuan Applied Psychology Research Center，（number，CSXL-22102）］

Objective To investigate the effects of hyperbaric oxygen preconditioning ( HBOP ) on human energy metabolism and antioxidant under acute hypoxia exposure , so as to provide new measures for the improvement of physical performance in those with acute hypoxia .Methods Eight healthy subjects had respectively 3-day, 5-day and 7-day HBOP, then, they underwent acute exposure to a simulated high altitude of 4 000 m.Exercise load experiments were conducted both before and after HBOP .Levels of glucose ( Glu), blood lactate ( BLA) , lactate dehydrogenase ( LDH) and superoxide dismutase ( SOD) were detected both before and after physical exercises .Results Following HBOP , no significant changes could be noticed in Glu level in the subjects , who underwent simulated 4 000 m physical exercise and its level remained relatively high during exposure(P>0.05).During exposure to hypoxia at an altitude of 4 000 m, BLA level both at rest and under physical exercise[(3.3 ±0.8)、(6.7 ±2.0) mmol/L] elevated signficantly, as compared with that at the sea level[(2.4 ±0.7)mmol/L], and statistical differences could be noted , when comparisons were made between them(P<0.05 or P<0.01).Following 7-day HBOP, the BLA levels after physical load [(4.5 ±1.3)mmol/L] were significantly decreased , as compared with those detected at 4 000 m, and at the same time, LDH activity was obviously elevated, with statistical significance(P<0.05).As compared with that of the control value at 4 000 m[(6.7 ±2.0) mmol/L], LDH levels after 3-day and 7-day HBOP were increased to some extent, which were equivalent to the control value at the sea level .After HBOP, GSH levels both at rest and under physical exercise were almost the same as that of the sea level , without statistical signficance (P<0.05). And no statistical significace could be seen in the changes of nergy metabolism , when comparisons were made between them (P <0.05).Conclusions Before acute hypoxia exposure, 3-day HBOP would enable the human body under physical load to maintain Glu at a relatively high level , increase LDH activity and help to decrease BLA level signfificantly , and at the same time , help to maintain the level of antioxidant at the sea level.For this reason, HBOP seemed to have positive effects on anti-oxidation, anti-fatigue and enhancement of physical performance under acute hypoxia .

Objective To investigate the effects of hyperbaric oxygen preconditioning ( HBOP ) on human energy metabolism and antioxidant under acute hypoxia exposure , so as to provide new measures for the improvement of physical performance in those with acute hypoxia .Methods Eight healthy subjects had respectively 3-day, 5-day and 7-day HBOP, then, they underwent acute exposure to a simulated high altitude of 4 000 m.Exercise load experiments were conducted both before and after HBOP .Levels of glucose ( Glu), blood lactate ( BLA) , lactate dehydrogenase ( LDH) and superoxide dismutase ( SOD) were detected both before and after physical exercises .Results Following HBOP , no significant changes could be noticed in Glu level in the subjects , who underwent simulated 4 000 m physical exercise and its level remained relatively high during exposure(P>0.05).During exposure to hypoxia at an altitude of 4 000 m, BLA level both at rest and under physical exercise[(3.3 ±0.8)、(6.7 ±2.0) mmol/L] elevated signficantly, as compared with that at the sea level[(2.4 ±0.7)mmol/L], and statistical differences could be noted , when comparisons were made between them(P<0.05 or P<0.01).Following 7-day HBOP, the BLA levels after physical load [(4.5 ±1.3)mmol/L] were significantly decreased , as compared with those detected at 4 000 m, and at the same time, LDH activity was obviously elevated, with statistical significance(P<0.05).As compared with that of the control value at 4 000 m[(6.7 ±2.0) mmol/L], LDH levels after 3-day and 7-day HBOP were increased to some extent, which were equivalent to the control value at the sea level .After HBOP, GSH levels both at rest and under physical exercise were almost the same as that of the sea level , without statistical signficance (P<0.05). And no statistical significace could be seen in the changes of nergy metabolism , when comparisons were made between them (P <0.05).Conclusions Before acute hypoxia exposure, 3-day HBOP would enable the human body under physical load to maintain Glu at a relatively high level , increase LDH activity and help to decrease BLA level signfificantly , and at the same time , help to maintain the level of antioxidant at the sea level.For this reason, HBOP seemed to have positive effects on anti-oxidation, anti-fatigue and enhancement of physical performance under acute hypoxia .

Objective To investigate the effect of scene-style education mode in endoscopic ultrasonography examination.Methods 170 patients undergoing endoscopic ultrasonography from May 2009to December 2011 in our hospital were chosen as the research object.They were randomly divided into the control group(conventional education mode group)and the observation group (scene-style education mode) with 85 cases in each group.The repeated rate of insertion,rate of complication,compliance degree,the POMS scale score,blood pressure and heart rate for the two groups of patients were compared.Results Compared with the control group,the repeated rate of insertion,rate of complication were lower,blood pressure and heart rate were lower,and compliance degree and POMS mood scale score were better in the observation group,there were significant differences.Conclusions The scene-style education mode can improve negative emotions of patients undergoing endoscopic ultrasonography significantly,it also plays a positive role in increasing their compliance degree and easing stress response.