Verhaltensphysiologie des Neugeborenen

Prechtl, H.F.R.; Lenard, H. G.

doi:10.1007/978-3-642-49906-7_5

Cited by 2 publications

(1 citation statement)

References 100 publications

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“…3), leads to the conclusion that the babies, certainly by week 4, were responding directly to the light/dark cycle (see also, D' Souza et al, 1992). Presumably, such changes reflect neurological development of both waking and sleep processes [see also, Anders and Keener, 1995;Ardura et al, 1995;D'Souza et al, 1992;Hellbrugge, 1977;Honnebier et al, 1989;Hoppenbrouwers et al, 1982;Prechtl and Lenard, 1968;Sitka, 1988); why they appeared to influence the cardiovascular rhythms less (see Fig. 3) is not clear, but this has been observed before .…”

Section: Exogenous Influencesmentioning

confidence: 77%

Twenty-four-hour and Ultradian Rhythmicities in Healthy Full-Term Neonates: Exogenous and Endogenous Influences

Weinert¹,

Sitka²,

Minors³

et al. 1997

Biological Rhythm Research

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Eleven healthy, full-term babies were studied on the second day after birth and again 4 weeks later. The babies lived on a 24-h light/dark cycle (light from 0700-1900) and were bottle-fed every 4 h. Systolic blood pressure, heart rate, skin (abdomen) and rectal temperatures were measured at 10-min intervals for 24 h on each occasion of study. The behavioural state of the baby was measured at the same time, and this information was used to purify the raw data (i.e., to separate it into the endogenous, clock-driven and exogenous, lifestyle-driven components). Raw and purified data were assessed for 24-h and ultradian (12-, 8-, 6-, 4-, 3-, 2-h) periodicities by cosinor analysis. We confirm the development of 24-h rhythmicity in skin and rectal temperatures between day 2 and week 4; at the same time, ultradian rhythms (4-h) developed in all variables. For heart rate and systolic blood pressure the development of a 4-h ultradian rhythm was in phase with the behavioural changes produced by feeding; by contrast, for the temperatures, these weak exogenous components were accompanied by a stronger 4-h component, that was out of phase with feeding. Masking effects due to sleep and activity changed in size between day 2 and week 4. Also, those positive masks produced by waking activities were more marked in the light, whereas the negative masks produced by sleep were more marked in the dark. Some implications of these results for the development of rhythmicity in infants, particularly whether due to lifestyle or the development of internal processes, are discussed.

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Section: Exogenous Influencesmentioning

confidence: 77%

Twenty-four-hour and Ultradian Rhythmicities in Healthy Full-Term Neonates: Exogenous and Endogenous Influences

Weinert¹,

Sitka²,

Minors³

et al. 1997

Biological Rhythm Research

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Introduction

1970

Acta Paediatrica

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Summary The insensible water loss through the lungs and the body surface of newborn infants has been measured for the first time directly. A total of 343 single measurements with 48 new‐ born infants of both sexes, younger than 28 hours, was performed. The significances of the results were statistically evaluated. Of our findings the following are the most important: 1. The insensible water loss under basal conditions is between 390460 mg/kg body weight and hour (mean values of classes O and A′), or between 6.36‐7.47 g/m2 body surface and hour (environment: temp.: 30.5–33.8°C; rel. humidity:37.2–55.5%). 2. During the first 24 hours of life the water loss is independent of the age. 3. There has only been a slight indication that there is a difference between sexes in this age group; the values for females are a little higher, but this is on the border of being sig‐nificant. 4. The mode of sleep is of great influence on the insensible water loss. On the average, long‐ sleeping infants lose much less water than short‐sleeping infants. 5. The insensible water loss greatly in‐creases with increasing activity of the infant. So far it has only been suspected that there is such an increase, however, the increase was never quantitatively determined. This increase is, according to our measurements, at least given by a factor of 1.7; it is very likely that with infants who cry intensively this increase is considerably larger.

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Verhaltensphysiologie des Neugeborenen

Cited by 2 publications

References 100 publications

Twenty-four-hour and Ultradian Rhythmicities in Healthy Full-Term Neonates: Exogenous and Endogenous Influences

Twenty-four-hour and Ultradian Rhythmicities in Healthy Full-Term Neonates: Exogenous and Endogenous Influences

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