Abstract
Objectives
Chrononutrition is referred to as a zeitgeber for its ability to synchronize the circadian rhythm. In addition to the role as circadian marker, sleep and melatonin are important factors for optimal maternal and infant outcomes. Understanding the chrononutrition factors associated with sleep quality and melatonin rhythm during pregnancy has practical importance for preventive care. Hence, this study aimed to examine the association between chrononutrition with sleep quality and melatonin rhythm during pregnancy.
Methods
A total of 114 primigravidas were recruited at randomly selected government maternal and child clinics in Kuala Lumpur, Malaysia. Gestational age and pre-pregnancy body mass index (BMI) were extracted from clinic records. Components of chrononutrition including meal timing, meal frequency, eating window, breakfast skipping, and night eating were assessed using 3-day food record. Sleep quality in the third trimester was determined using Pittsburgh Sleep Quality Index (PSQI). Subsample (n = 48) provided salivary samples at 4 time-points (9:00, 15:00, 21:00 and 3:00 h) over 24 hours for melatonin assay.
Results
The mean gestational age of participants was 33.0 (2.1) weeks; 13% were underweight and 22% were overweight/obese before pregnancy. Average daily meal frequency was 4.1 (0.9). The majority (68%) practiced a shorter eating window (≤12 hours); 25% skipped breakfast and 19% ate within 2 hours pre-bedtime. The prevalence of poor sleep among the participants was 56%. Mean salivary melatonin level was 19.6 (16.3) pmol/L. In the adjusted linear regression model, lower meal frequency and fat intake during dinner were significant predictors of poor sleep quality (β = −0.266, P = 0.035 and β = −0.232, P = 0.026, respectively). Eating nearer to bedtime was significantly associated with greater deviation of melatonin acrophase from mid-sleep clock time (β = −0.339, P = 0.043).
Conclusions
Findings suggested that unfavorable characteristics of chrononutrition may contribute to poor sleep and misalignment of melatonin phase. Components of chrononutrition may be incorporated into meal intervention to improve maternal sleep quality and circadian health.
Funding Sources
Research relating to this abstract was funded by the Ministry of Education Malaysia Fundamental Research Grant.