Background Biological rhythmicity, particularly circadian rhythmicity, is considered to be a
key mechanism in the maintenance of physiological function. Very little is known, however …

Objective. The study of biological rhythms and the influence of environmental factors in the
timing and synchronization of different rhythmic events have important implications for …

Circadian rhythms are endogenously generated rhythms that have a period length of about
24 hours. Evidence gathered over the past decade indicates that the circadian timing system …

Circadian rhythms are endogenously generated rhythms with a period length of
approximately 24 hours. Evidence gathered during the past decade indicates that the …

The fetal biological clock is an endogenous clock capable of generating circadian rhythms
and responding to maternal entraining signals. By at least the third trimester of pregnancy …

Twenty‐six preterm infants, postconceptional age from 28 to 35 weeks and postnatal age
approximately 14 days, were included in a study of the development of temperature …

Objective. The mammalian" biological clock," which resides in the hypothalamic
suprachiasmatic nucleus, has an important role in both the timing and organization of sleep …

The circadian system in mammals ensures adaptation to the light-dark cycle on Earth and
imposes 24-h rhythmicity on metabolic, physiological and behavioral processes. The central …

This study investigated evidence of a circadian rhythm in the physiologic variables of
transcutaneous oxygen (tcPO 2) level, pulse rate, respiratory rate, frequency of respiratory …

Photic and non-photic environmental factors are suggested to modulate the development of
circadian rhythms in infants. Our aim is to evaluate the development of biological rhythms …