The gradual, often subtle, decline or alteration in the production, secretion, or responsiveness to various endocrine signals that naturally occurs as an organism progresses through the aging process. This drift impacts homeostatic balance across multiple physiological systems, including metabolism and reproductive function. Clinically, this shift necessitates adjustments in understanding baseline physiological parameters for older adults.
Origin
This concept arises from longitudinal studies in endocrinology and gerontology, tracking changes in hormone levels over decades. The term ‘drift’ suggests a slow, non-acute deviation from peak adult endocrine function, rather than a sudden failure. It acknowledges the cumulative effect of time on the hypothalamic-pituitary-gonadal (HPG) or hypothalamic-pituitary-adrenal (HPA) axes.
Mechanism
The mechanism involves several factors, including reduced sensitivity of target tissues to circulating hormones, altered feedback loops, and changes in the enzymatic pathways responsible for hormone synthesis or clearance. Diminished pulsatile release patterns from central glands contribute significantly to this physiological decrement. Understanding this drift is key to addressing age-associated syndromes.
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