산소와 색채 조명 자극의 조합이 스트레스 완화에 미치는 효과: 심리 및 자율신경계 반응을 중심으로
Effect of Combination of Oxygen and Color Light on Stress Relaxation: focused on Psychological and Autonomic Responses
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스트레스는 자율신경계 반응의 변화를 수반하며, 특히 심박변이도 지표는 스트레스에 의한 자율신경계의 활동을 반영하는 양적 지표로 사용된다. 본 연구에서는 스트레스 완화를 위한 산소와 색채 조명의 복합 자극이 제시되는 동안 자율신경계 반응의 변화를 확인하였다. 42명의 실험참가자는 지난 2주 동안 경험한 스트레스에 대한 증상들을 스트레스 반응 척도에 평가하였다. 스트레스 평가 후, 실험참가자는 복합 자극을 제시받았고, 자극 제시 전과 후, 그리고 자극이 제시되는 동안 심전도 신호가 기록되었다. 자극 조건은 30% 농도의 산소와 백색 조명, 산소와 주황색 조명과 산소와 파란색 조명의 조합의 세 가지로 구성되었다. 심박률 (HR), R-R간격의 표준편차 (SDNN), 연속한 R-R 간격 차이 값의 평균제곱근 (RMSSD)과 심박변이도의 저주파 성분 (LF), 고주파 성분 (HF), 그리고 LF와 HF의 비율을 심박변이도 지표로 추출하였다. 이들 지표는 자극 제시 전과 후의 평균을 비교하는데 활용되었다. 결과는 자극 조건이 제시되고 난 후, HR과 LF/HF ratio의 유의한 감소를 보여주었다. 특히, 산소와 파란색 조명이 제시된 조건에서 다른 두 조건보다 유의하게 큰 RMSSD와 HF의 증가 및 LF/HF ratio의 감소가 나타났다. 이는 30% 농도의 산소와 파란색 조명의 조건이 부교감신경의 활성화에 의한 자율신경의 균형을 유발하여 스트레스 이완에 가장 효과적임을 보여주었다.
Abstract
Stress is accompanied by changes in the autonomic nervous system responses and the heart rate variability (HRV) index is one of the quantitative markers reflecting the autonomic responses induced by stressors. In this study, we observed changes in autonomic responses induced by combination of 30% oxygen administration and color light for stress relaxation. Forty-two participants rated the stress symptoms during the past two weeks on the stress response scale. After stress assessment, they were exposed to three therapy conditions and ECG signals were recorded before, during and after therapy. Three therapy conditions consisted of only 30% oxygen administration with white light, a combination of 30% oxygen and orange light, and a combination of 30% oxygen and blue light. Heart rate variability indices extracted from ECG signals were heart rate (HR), the standard deviation of the RR interval (SDNN), the mean square root of the consecutive RR interval difference values (RMSSD), the low frequency component of heart rate variability (LF), the high frequency component (HF), and LF/HF ratio. These indicators were used to compare the mean value before and after therapy. The results showed that there were significant decreases in HR and LF/HF ratio after therapy compared to before therapy. In particular, the condition with 30% oxygen and blue light yielded significantly greater RMSSD and HF increases as well as decrease of LF/HF ratio than the other two conditions. Our results suggest that therapy with 30% oxygen and blue light is most effective for relaxation of stress which means the autonomic balance by parasympathetic activation.
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