The abstract is read at the publisher; the summary is JClub's.
In 21 healthy school-aged children (9–14 years), mean light-induced melatonin suppression was unchanged after ~two weeks at camp, despite large individual differences.
- Why it matters: The study addresses whether prior light history alters how strongly evening light suppresses melatonin within the same child, and what circadian or daytime light factors track that variability.
- What they did: Children completed evening light experiments at the start of camp and about two weeks later, comparing 200 {+/-} 30 lx, 5000 K versus dim light (< 30 lx) with integration from DLMO; sleep diaries and wrist illuminance were analyzed with Spearman correlations and paired t-tests.
- The result: Suppression did not differ between sessions (p = 0.21); in Pre-camp, greater suppression linked to later DLMO (rho = 0.49, p = 0.028), and in Camp, higher same-day geometric mean illuminance linked to lower suppression (n = 15; rho = -0.58, p = 0.024).
The findingWhy it mattersWhat they didThe result
AI summary of the abstract · may contain errors · not medical advice · read the paper.