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Human circadian rhythms: entrainment. Ken-ichi HONMA 1 , Sato HONMA 1 , Yumiko KATSUNO 1 , Nobue KANEMATSU 1 1Department of Physiology Hokkaido University School of Medicine pp.993-1000
Published Date 1992/12/10
DOI https://doi.org/10.11477/mf.1431900297
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In the past decade, much progress has been achieved in the entrainment mechanism of human circadian rhythms. Artificial light-dark cycles with bright light over than 5,000 lux during the light period were demonstrated to entrain the free-running human circadian rhythm. Moreover, a single bright light pulse phase-shifted the free-running rhythm in a phase dependent manner, and a phase-response curve for bright light was described. In addition to the phase-shifting effect, bright light was suggested to change the amplitude of circadian oscillation. When the sleep-wake schedule was suddenly phase-advanced, the rectal temperature rhythm reentrained to a new sleep schedule gradually (transient period). In the transient period, the temperature rhythm was damped temporally, namely its oscillatory amplitude was decreased. However, when bright light was introduced in the transient period, such a damping was not observed. Bright light was also suggested to strengthen the oscillatory coupling between the sleep-wake cycle and the rectal temperature rhythm. Under the free-running condition, these two rhythms are often desynchronized to each other and show different free-running periods. A single bright light as well as a bright light cycle of 24 hour period were demonstrated to resynchronize the two circadian rhythms. Based on these findings bright light is concluded to regulate the human circadian rhythm.


Copyright © 1992, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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