Midday exposure to bright light changes the circadian organization of plasma melatonin rhythm in humans

@article{Hashimoto1997MiddayET,
  title={Midday exposure to bright light changes the circadian organization of plasma melatonin rhythm in humans},
  author={Satoko Hashimoto and Masako Kohsaka and Kouji Nakamura and Hiroshi Honma and Ken-ichi Honma},
  journal={Neuroscience Letters},
  year={1997},
  volume={221},
  pages={89-92}
}
Effects of bright light exposure at midday were examined on plasma melatonin rhythm in humans under controlled living conditions. Bright light of 5000 1x was provided from the ceiling at midday (1100-1700 h) for 3 consecutive days and the circadian rhythm in plasma melatonin was determined from the fourth to fifth day. The control study was performed in the same subjects who spend four days under dim light conditions (less than 200 1x). The subjects were allowed to sleep from 2400 to 0800 h… CONTINUE READING

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