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High sensitivity and interindividual variability in the response of the human circadian system to evening light
Strong but varying effects of evening light on the human body clock
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Abstract
The group-level for 50% is 24.60 lux, indicating high sensitivity to evening light.
- Interindividual differences in sensitivity to evening light may contribute to vulnerability to circadian disruption.
- Light intensities of 10, 30, and 50 lux led to later melatonin onset by 22, 77, and 109 minutes, respectively.
- Individual effective dose values varied significantly, ranging from 6 lux in the most sensitive individual to 350 lux in the least sensitive.
- A 26% coefficient of variation in individual effective doses suggests substantial variability in response to light exposure.
- The findings imply that the same light environment can affect individuals' circadian systems differently.
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Key numbers
24.60
Group-Level for
for 50% in the group.
6 of 350
Range of Individual Values
Individual effective doses ranged widely.
109 min
Delay in Onset
Apparent onset at 50 was delayed by this duration.