Decline in endogenous hormone production associated with the aging process, impacting homeostasis. This is a common physiological observation across the endocrine system. Clinically, it signifies a shift from peak endocrine function to a state of relative deficiency. Understanding this deficit is crucial for assessing age-related physiological changes.
Origin
The term arises from longitudinal studies in endocrinology tracking declining circulating levels of key signaling molecules like androgens, estrogens, and growth hormone releasing factors over decades. It is rooted in the natural progression of glandular senescence within human physiology. This concept differentiates from pathological endocrine disease by its pervasive, gradual nature.
Mechanism
The primary mechanism involves reduced responsiveness or capacity within the hypothalamic-pituitary-gonadal or adrenal axes. Cellular senescence within endocrine glands contributes to lower secretory output. Furthermore, altered receptor sensitivity in target tissues can exacerbate the functional deficit, even when baseline levels are marginally maintained.
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