Vondrasová-Jelínková D, Hájek I, Illnerová H
Institute of Physiology, Academy of Sciences of the Czech Republic, Vídenská 1083, 14220, Prague 4, Czech Republic.
Brain Res. 1999 Jan 16;816(1):249-53. doi: 10.1016/s0006-8993(98)01189-5.
Fifteen human subjects were exposed to natural outdoor summer light from 0415 h until 2000 h for 4 days and then from 0800 h until 1600 h for another 4 days. Following shortening of the natural summer photoperiod, times of the morning salivary melatonin decline and cortisol rise did not change whereas the time of the evening melatonin rise phase advanced by about 1.5 h within 1 day and further did not change significantly. Consequently, the melatonin signal duration extended markedly within 1 day. The data show that the compressed melatonin rhythm waveform in humans experiencing a long natural summer photoperiod from sunrise until sunset may change rapidly following a shortening of the photoperiod.
15名受试者在4天内于凌晨4点15分至晚上8点暴露于自然户外夏日光照下，随后在另外4天内于上午8点至下午4点暴露于该光照下。在自然夏日光周期缩短后，早晨唾液褪黑素下降和皮质醇上升的时间没有变化，而晚上褪黑素上升阶段的时间在1天内提前了约1.5小时，且此后没有显著变化。因此，褪黑素信号持续时间在1天内显著延长。数据表明，在经历从日出到日落的漫长自然夏日光周期的人类中，压缩的褪黑素节律波形在光周期缩短后可能会迅速改变。
