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- W2000616892 abstract "Bright light is believed to be the most important stimulus for shifting the circadian system. However, evidence suggests that exercise can also shift the body clock and that the two stimuli, when separated, can elicit synergistic shifting effects. PURPOSE: To compare the phase-shifting effects of bright light alone vs. exercise alone (of equivalent durations) vs. bright light followed by exercise. METHODS: Six adults (ages 18–25 yr) completed each of three 2.5 day treatments in counterbalanced order. During each treatment, subjects followed a 180-minute ultra-short sleep-wake cycle, which involved sleeping in darkness for 1-hour intervals, followed by staying awake in dim light for 2-hour intervals, repeated throughout each treatment. Urine was collected every 90 minutes and analyzed for 6-sulphatoxymelatonin (aMT6s). During each treatment, baseline acrophase of PMT6s (24-hr peak) was assessed from samples collected during the first 24 hours in the lab. The phase-shifting stimuli were administered on night 2 of each treatment. Subjects either received (1) Bright Light (5,000 lux) from 10:10–11:40 pm; (2) Exercise (running at 70% max) from 10:10–11:40 pm; or (3) Bright Light (10:10–11:40 pm), followed by Exercise from 4:10–5:40 PM. Final PMT6s acrophase was assessed during the last 24-hours in the laboratory. Shifts in PMT6s acrophase from baseline to final assessment were calculated. RESULTS: ANOVA revealed a significant treatment effect for phase shifts [p=0.028]. Post-hoc data showed significant differences between Bright Light± Exercise (1.35±0.08 SE hr) vs. Exercise (0.79±0.15 hr), but not following Exercise alone vs. Bright Light alone (0.95±0.10 hr). CONCLUSIONS: The similar phase-shifting effects of bright light and exercise is noteworthy because it is generally accepted that bright light has a much more powerful circadian effect than any other stimulus. The shift following bright light + exercise was relatively large, but not consistent with synergistic effects. Research supported by NIH HL071560 and the USC Research and Productive Scholarship Fund." @default.
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- W2000616892 date "2006-05-01" @default.
- W2000616892 modified "2023-09-23" @default.
- W2000616892 title "Circadian Phase-Shifting Effects of Bright Light vs. Exercise and Bright Light and Exercise Combined" @default.
- W2000616892 doi "https://doi.org/10.1249/00005768-200605001-01339" @default.
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