Development of the circadian system in early life: maternal and environmental factors

Author:

Wong Sachi D.,Wright Kenneth P.,Spencer Robert L.,Vetter Céline,Hicks Laurel M.,Jenni Oskar G.,LeBourgeois Monique K.

Abstract

AbstractIn humans, an adaptable internal biological system generates circadian rhythms that maintain synchronicity of behavior and physiology with the changing demands of the 24-h environment. Development of the circadian system begins in utero and continues throughout the first few years of life. Maturation of the clock can be measured through sleep/wake patterns and hormone secretion. Circadian rhythms, by definition, can persist in the absence of environmental input; however, their ability to adjust to external time cues is vital for adaptation and entrainment to the environment. The significance of these external factors that influence the emergence of a stable circadian clock in the first years of life remain poorly understood. Infants raised in our post-modern world face adverse external circadian signals, such as artificial light and mistimed hormonal cues via breast milk, which may increase interference with the physiological mechanisms that promote circadian synchronization. This review describes the very early developmental stages of the clock and common circadian misalignment scenarios that make the developing circadian system more susceptible to conflicting time cues and temporal disorder between the maternal, fetal, infant, and peripheral clocks.

Publisher

Springer Science and Business Media LLC

Subject

Physiology (medical),Public Health, Environmental and Occupational Health,Anthropology,Orthopedics and Sports Medicine,Physiology,Human Factors and Ergonomics

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