스트레스 취약성 및 과제가 심혈관계 반응성에 미치는 영향
The Effects of Stress Vulnerability and Task on Cardiovascular Reactivity
김지연 (영남대학교)
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초록
본 연구는 심리적 및 신체적 스트레스 취약성이 스트레스로 인한 심혈관계 반응성에 미치는 효과를 알아보고자 하였다. 실험참가자는 스트레스 취약성 검사를 통해서 취약성이 높은 집단과 낮은 집단으로 구분되었으며, 또한 과제수행 후의 회복기에 추가의 과제를 예기하는 집단과 단순히 회복만을 하는 집단으로 나누어졌다. 심장박동 변산성과 말초혈관 수축의 지표들이 기저선, 과제기 및 회복기 동안에 측정되었다. 그 결과 스트레스 취약성은 부적 정서와 회피관련 동기유형과 관련이 있었다. 그리고 스트레스 취약성이 높은 집단은 낮은 집단에 비해 높은 심박률을 나타내었고, 스트레스 과제는 심박률과 말초혈관수축을 증가시켰는데, 이것들은 교감신경계 활성화의 증거이다. 추가의 과제수행에 대한 예기는 휴식기에 심박률의 회복을 방해하였다. 기저선 부교감신경계 활동수준이 높은 개인은 스트레스 중에 높은 부교감신경계 활동의 억제를 그리고 회복기에는 빠른 회복을 나타내었다. 이 결과들은 스트레스 취약성이 교감신경계의 활성화를 통해 심장활동 변산성에 영향을 미친다는 것을 시사하는 것이다. 끝으로 스트레스 반응과 관련된 자율신경계의 활동패턴에 관해 논의되었다.
- keywords
- stress vulnerability, autonomic nervous system, heart rate variability, peripheral vasoconstriction, recovery, stress vulnerability, autonomic nervous system, heart rate variability, peripheral vasoconstriction, recovery, 스트레스 취약성, 자율신경계, 심장활동 변산성, 말초혈관 수축, 회복
Abstract
This study investigated the effects of stress vulnerability and task on cardiovascular activity. Experiment involved a 2(stress vulnerability) × 2(task condition) design. Heart rate variability and peripheral vasoconstriction were recorded by means of electrocardiograph and finger plethysmograph during baseline, mental arithmetic and recovery periods. Results revealed that high vulnerability group exhibited significantly higher heart rate and peripheral vasoconstriction than low vulnerability group before, during and after arithmetic task. Compared to baseline, both heart rate and peripheral vasoconstriction were significantly increased during mental arithmetic. There was no significant group difference in vagal tone during three periods, but resting vagal influence and the capacity to suppress this influence during mental arithmetic were founded to be related. Participants who anticipated to participated in a second task after recovery period showed poorer recovery from heart rate aftereffect following stress than those who did not. These results suggested that stress vulnerability mainly impacted on heart rate variability through increasing sympathetic activation. Autonomic correlates of both stress reactivity and the self-reported personality variables were discussed.
- keywords
- stress vulnerability, autonomic nervous system, heart rate variability, peripheral vasoconstriction, recovery, stress vulnerability, autonomic nervous system, heart rate variability, peripheral vasoconstriction, recovery, 스트레스 취약성, 자율신경계, 심장활동 변산성, 말초혈관 수축, 회복
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