Intermittent bright light and exercise to entrain human circadian rhythms to night work

被引:73
作者
Baehr, EK [1 ]
Fogg, LF [1 ]
Eastman, CI [1 ]
机构
[1] Rush Presbyterian St Lukes Med Ctr, Biol Rhythms Res Lab, Dept Psychol, Chicago, IL 60612 USA
关键词
body temperature; sleep; shift work; work-schedule tolerance;
D O I
10.1152/ajpregu.1999.277.6.R1598
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
Bright light can phase shift human circadian rhythms, and recent studies have suggested that exercise can also produce phase shifts in humans. However, few studies have examined the phase-shifting effects of intermittent bright light, exercise, or the combination. This simulated night work field study included eight consecutive night shifts followed by daytime sleep/dark periods (delayed 9 h from baseline). There were 33 subjects in a 2 x 2 design that compared 1) intermittent bright light (6 pulses, 40-min long each, at 5,000 lx) versus dim light and 2) intermittent exercise (6 bouts, 15-min long each, at 50-60% of maximum heart rate) versus no exercise. Bright light and exercise occurred during the first 6 h of the first three night shifts. The circadian phase marker was the demasked rectal temperature minimum. Intermittent bright-light groups had significantly larger phase delays than dim-light groups, and 94% of subjects who received bright light had phase shifts large enough for the temperature minimum to reach daytime sleep. Exercise did not affect phase shifts; neither facilitating nor inhibiting phase shifts produced by bright light.
引用
收藏
页码:R1598 / R1604
页数:7
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