Interaction between composite dietary antioxidant index and physical activity on sleep condition: NHANES 2007-2018.

The composite dietary antioxidant index (CDAI), a composite score of multiple dietary antioxidants that assesses and reflects the overall impact of dietary antioxidants on health. The state of sleep is one of the major public health issues. The interaction between CDAI combined with physical activity on sleep is currently unclear. Therefore, we aimed to explore the association between CDAI, physical activity, and sleep condition. A total of 23,425 participants were enrolled. Six dietary factors (vitamin A, vitamin C, vitamin E, zinc, selenium, and carotenoids) were selected to score the CDAI. The association between CDAI, physical activity, and sleep condition were analyzed using weighted binary logistic regression. A stratified analysis of sub-groups was also used in this study. Both high levels of CDAI and active physical activity were protective factors for poor sleep condition (P<.05). There was an interaction between CDAI and physical activity (P-interaction=.062). There was a positive association between higher levels of CDAI and good sleep condition among those who were physically active. Compared to the third tertile of CDAI (CDAI T3) and active activity groups, all subgroups except the second tertile CDAI (CDAI T2) and active activity groups had statistically significant (P<.05) increased odds of poor sleep condition. Both low levels of CDAI and physical inactivity were significantly associated with sleep condition. There was an interaction between CDAI and physical activity. Low levels of CDAI combined with physical inactivity may be associated with an increased odds of poor sleep condition.