Effects Of Personality Traits And Emotion Regulation On Heart Rate Variability Under Psychological Stress

Objective: The purpose of this study is to study the effects of personality traits and emotion regulation on the variability of heart rate under psychological stress,and to explore the specificity of autonomic nervous activity under psychological stress.It can not only enrich the study of physiological psychological response mechanism of psychological stress,but also provide a basis for people to better cope with stress situations and to deal with negative emotions induced by stress situations such as anxiety and depression.Method: This study was carried out by means of a combination of questionnaire and experimental methods.First,the Eysenck Personality Questionnaire(EPQ)was distributed in a public class,library and study room in a university of Hebei Province,and then the subjects with different personality traits were selected and invited to the physiological laboratory.Public speaking is the psychological stress source.personality traits and emotion regulation are between-subjects variables,the task phase is a within-subject variable.The low frequency power LF,high frequency power HF,LF/HF,state anxiety were measured under different stress conditions.All experimental data were processed using SPSS20.0.Statistical methods were paired samples T test,repeated measurement of variance analysis,single factor analysis of variance and Kruskal-Waills test.Results:(1)The SAI score of the overall of the baseline was significantly lower than that of the stress period;The overall subjects had significant differences in LF at different task stages(stress period> recovery period> baseline period);There were far differences in HF at different stages of task(baseline period> recovery period> stress period);Subjects had significant differences in LF/HF at different task stages(stress period> recovery period>baseline period).(2)The baseline SAI score of the different groups was significantly lower than the SAI score of the stress period.The difference of LF of different task stages in the same personality traits groups was significant.Multiple comparisons found that subjects of Introverted,high neurotic groupe had significant differences in LF between different task stages(stress period>recovery period> baseline period);Extroversion,high neurotic subjects were significantlydifferent in LF between different task stages(stress period> recovery period> baseline stage);Extroversion and low neurotic subjects were significantly different in LF between different task stages(stress period> recovery period;stress period> baseline stage);Extroversion,high neurotic subjects were significantly different in HF between different task stages(baseline period> stress period;recovery period> stress stage);There was no significant difference in HF for Extroversion,low neurotic subjects and Introverted,high neurotic subjects.The LF of the suppression group was significantly different at different stages of task(stress period> baseline stage;recovery period> baseline stage);In the control group,LF was significantly different in different task stages(stress period> recovery period>baseline period);The scores of LF in the reappraisal group were significantly different at different stages(stress period> recovery period> baseline stage);There was no significant difference in HF in the reappraisal group;There was significant difference in HF between the different task stages in the control group(baseline> recovery period> stress period);There was a significant difference in HF between the different task stages in the suppression group(baseline period> recovery period> stress period).(3)There were no significant differences in SAI scores,LF,HF,LF / HF between the different groups at baseline.LF of introverted,high neurotic subjects were significantly higher than those of extroversion,high neuroticism and extroversion,low neurotic group in the stress period.HF of Introverted,high neurotic subjects was significantly higher than that in extroversion,high neurotic groups.LF/HF of Introverted,high neurotic subjects was significantly higher than that in extroversion,high neurotic group and extroversion,low neurotic group.In the stress period,the differences of the indicators between different emotion regulation groups were not significant.During the recovery period,there were no significant differences in LF,HF,LF / HF between different groups.Conclusion:(1)The task of stress better induced the psychological and physiological response of the subjects,and the task of stress is effective.The LF of the overall subjects increased and the HF of the overall subjects decreased.The autonomic model showed sympathetic nerve excitement,vagal suppression,sympathetic-vagal balance decreased under psychological stress.(2)Under the psychological stress condition,the introversion,high neurotic group had stronger sympathetic reactivity than those of extroversion,high neuroticism and extroversion,low neuroticism group;Extroversion,low neurotic group subjects had a stronger sympathetic response to recovery than the extroversion,high neuroticism group;subjects of extroversion,high neurotic group had a stronger vagal withdrawal response than introversion,high neuroticism subjects.(3)Under the psychological stress condition,the expression inhibition group had stronger sympathetic response recovery and stronger vagal withdrawal than the cogniti-ve reassessment group.(4)In the psychological stress condition,the extroversion and high neuroticism group showed the classical antagonistic pattern of sympathetic nerve excitability and vagal suppression.Introversion and neurotic high group had stronger sympathetic reactivi ty under the condition of inhibition of expression,and the adjustment ability of vagal was also enhanced.Extroversion,low neurotic group showed a model of sympathetic activation alone,demonstrating the resilience of the physiological response.