Year: 2018
Type: article
Study design: Observational Study
Abstract: Context: Understanding the biological rhythms and stress response in sick newborns is important to minimize the negative effects of intensive care. Salivary cortisol has been used as a noninvasive surrogate marker of adrenal function; however, understanding of its control variables is insufficient. Objective: To investigate the presence of feeding-induced cortisol response and its control variables in newborns. Design, Setting, and Patients: Fifty-three newborn infants, who were between 30 and 40 weeks' corrected age and were on 3-hourly regular oral/enteral feeding, were recruited between January 2013 and June 2014. Main Outcome Measure: Saliva samples were collected before and 1 hour after regular feeding. Dependence of cortisol levels (adjusted for postnatal age) and their feeding-related elevation on clinical variables was assessed by using generalized estimating equations. Results: Higher cortisol levels were associated with corrected age ≥37 weeks and saliva samples collected after feeding (both P < 0.001). Oral feeding was associated with a greater feeding-induced cortisol response compared with exclusive enteral feeding (P = 0.034), whereas a prolonged feeding duration (≥30 minutes) was associated with a reduced cortisol response compared with brief feeding (<30 minutes) (P < 0.001). Gestational age, corrected age, antenatal/postnatal glucocorticoids, type of milk, and daily feeding volume had no effect on cortisol response. Conclusions: Feeding-induced cortisol response was observed in newborns. The cortisol response was more prominent following oral feeding and was reduced with prolonged feeding. Future studies may investigate whether feeding-induced cortisol response plays a role in the acquisition of adrenal ultradian and diurnal rhythms.
Institutions: Kurume University, Nagoya City University
Language: English
Subfield: Behavioral Neuroscience
Field: Neuroscience
Domain: Life Sciences
Open Access status: bronze
Awards: Research and practice on the gap between subjective and objective sleep evaluations that mediates psychophysiological stress responses, Longitudinal influence of intrauterine growth restriction to the hypothalamus-pituitary-adrenal axis, G1303579877, G1304846251, G1619941322, Analysis of the formation process of neonatal circadian rhythm using endocrine markers, Cerebral circulatory control in response to perinatal stress in late preterm infants, G5299294418, Quantification of neonatal pain using a cot-side polygraph, Bed-side assessment of brain injury using time-resolved near-infrared spectroscopy
OpenAlex ID: W2885944404