This study examined the validity of a novel metric of circadian health, the Entrainment Signal Regularity Index (ESRI), and its relationship to changes in BMI during the school year and summer.
In a longitudinal observational data set, this study examined the relationship between ESRI score and children's (
The ESRI score was higher during the school year (0.70 ± 0.10) compared with summer (0.63 ± 0.11);
Overall, children demonstrated higher entrainment regularity during the school year compared with the summer. During summer, having a higher entrainment signal was associated with smaller changes in summertime BMI. This effect was independent of the effects of children's sleep midpoint, sleep regularity, and physical activity on children's BMI.