Alterations of circadian rhythmicity and sleep in aging: endocrine consequences

Hormone Research
E Van CauterG Copinschi

Abstract

All 24-hour endocrine rhythms partially reflect the interaction of circadian rhythmicity with sleep-wake homeostasis but their relative contributions vary from one system to another. In older adults, many 24-hour rhythms are dampened and/or advanced, including those of cortisol and GH. Amplitude reduction and phase advance of 24-hour rhythms may represent age-related changes in the central nervous systems underlying circadian rhythmicity and sleep-wake homeostasis. Age-related alterations in circadian function could also reflect decreased exposure and/or responsivity to the synchronizing effects of both photic (e.g. light exposure) and nonphotic (e.g. social cues) inputs. There are pronounced age-related alterations in sleep quality in aging which consist primarily of a marked reduction of slow-wave sleep, a reduction in REM stages and a marked increase in the number and duration of awakenings interrupting sleep. Alterations in slow-wave sleep occur abruptly in young adulthood (30-40 years of age) whereas disturbances in amounts of REM and wake appear more gradually. This article reviews evidence indicating that deficits in characteristics of sleep-wake homeostasis and circadian function may mediate age-related alterations in s...Continue Reading

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