ABSTRACT

It has been proved that lighting has nonvisual effects on the human body, including changes in heart rate and blood pressure. Heart rate and blood pressure are associated with the autonomic nervous system and can indicate stress level. The present study investigates whether heart rate and blood pressure are influenced by the frequency or duty cycle of pulsed light, together with the duration of lighting. Twelve healthy young subjects were recruited for the investigation. Subjects were exposed to pulsed light of varying frequencies (40 Hz, 100 Hz, 300 Hz) and duty cycles (10%, 50%, 90%). Exposure time was divided into two groups: short-time (20 min) and long-time (3 hours). Heart rate and blood pressure were measured during the experiments. Results showed that after a short lighting period (20 min), heart rate and blood pressure were significantly higher under 40 Hz pulsed than that under stable light, while 100 Hz and 300 Hz had no significant difference. After 3 hours of exposure time, the two indices became higher under 100 Hz (no flicker perceived with eyes) with 10% duty cycle, while 50% and 90% duty cycle showed no significant difference. These findings indicate that pulsed light will cause a deviation of heart rate and blood pressure from that under stable light.

摘要

事实证明，照明对人体有非视觉影响，包括心率和血压的变化。心率和血压与自主神经系统有关，可以指示压力水平。本研究调查心率和血压是否受脉冲光的频率或占空比以及照明持续时间的影响。招募了 12 名健康的年轻受试者进行调查。受试者暴露于不同频率（40 Hz、100 Hz、300 Hz）和占空比（10%、50%、90%）的脉冲光。暴露时间分为两组：短时间（20分钟）和长时间（3小时）。在实验期间测量心率和血压。结果表明，在短暂的光照时间（20 分钟）后，40Hz脉冲下心率和血压明显高于稳定光下，而100Hz和300Hz无显着差异。暴露时间 3 小时后，在 10% 占空比的情况下，100 Hz（眼睛感觉不到闪烁）下，这两个指标变得更高，而 50% 和 90% 占空比则没有显着差异。这些发现表明，脉冲光会导致心率和血压与稳定光下的偏差。