Whitmore J N, French J, Fischer J R
Air Force Research Laboratory, Brooks AFB, USA.
J Hum Ergol (Tokyo). 2001 Dec;30(1-2):267-72.
This study compared the effects of a brief pulse (60-minute) of three full spectrum light intensities (1000, 500 and 30 lux) and two green light intensities (1000 and 500 lux) administered between 0200 and 0300 hrs. Ten participants were involved in this repeated measures study. Each participant experienced one condition every week for five weekends. Sessions began at 1800 hours and ended at 0600 hours the following day. Outside of the 60-minute exposure period, each session was spent in 30 lux white light. Oral temperature, salivary melatonin, cognitive performance and subjective mood were sampled throughout the sessions. Analysis revealed that all of the experimental light conditions significantly reduced salivary melatonin concentrations immediately following the pulse. This effect was not maintained beyond the duration of the light pulse. There was no significant effect on oral temperature. There were also no significant effects on cognitive performance and subjective mood, though some positive trends were observed. These results argue that brief, moderate intensity, pulses of either green or full spectrum light are sufficient to suppress the normal nocturnal rise in melatonin. However, the level of suppression obtained does not translate into significant improvement in cognitive performance or subjective mood.
本研究比较了在02:00至03:00之间给予三种全光谱光强度（1000、500和30勒克斯）和两种绿光强度（1000和500勒克斯）的短暂脉冲（60分钟）的效果。十名参与者参与了这项重复测量研究。每位参与者在五个周末每周体验一种条件。实验从18:00开始，第二天06:00结束。在60分钟的暴露期之外，每次实验都处于30勒克斯的白光下。在整个实验过程中对口腔温度、唾液褪黑素、认知表现和主观情绪进行采样。分析表明，所有实验光照条件在脉冲后立即显著降低了唾液褪黑素浓度。这种效果在光脉冲持续时间之外没有持续。对口腔温度没有显著影响。对认知表现和主观情绪也没有显著影响，尽管观察到了一些积极趋势。这些结果表明，短暂、中等强度的绿光或全光谱光脉冲足以抑制夜间褪黑素的正常升高。然而，所获得的抑制水平并未转化为认知表现或主观情绪的显著改善。
