加载中…
Place · Level 3
4-10 年过渡期 · 雌激素不是单向下降是剧烈波动 · KNDy 神经元 + 潮热 · 骨、代谢、心血管节点 · MHT 时机窗
cofactor · 1
Protein needs after menopause are badly underestimated: the 0.8 g/kg/day RDA is not enough and the real target is 1.2-1.6. With oestrogen gone the anabolic signal is weaker, so the same protein drives less synthesis and the shortfall has to be made up in quantity.
regulates · 7
→Bone
Perimenopause is the bone-loss inflection — E2 withdrawal disrupts RANKL/OPG; BMD drops 5-10% in the first 5 years. Not a 65+ problem.
Perimenopause + first 5 yr postmenopause is peak bone-loss window (~2-3%/yr, spine higher). MHT (especially transdermal E2) is the most effective bone-protective option (beats bisphosphonates) but has a timing window; missing it relegates MHT to second-line. Pre-50 evaluation matters.
Perimenopausal insomnia is not psychological: allopregnanolone, a progesterone metabolite, is a GABA modulator, so the high-progesterone luteal phase was helping sleep. In this window progesterone swings hard, and all three patterns — onset, maintenance, early waking — become common.
Muscle is not lost at a steady rate: roughly 1-1.5% a year from 50 to 60, accelerating to 2-3% after 70, with strength falling faster than size. In women the curve visibly steepens once oestrogen drops at menopause.
Estrogen withdrawal is the primary trigger for menstrual + perimenopausal migraine. Frequency + intensity rise in early perimenopause, often fall post-menopause. MHT type/timing materially affects attacks — transdermal E2 beats oral.
In the luteal phase the core-temperature threshold band narrows, so the same warmth feels hotter. That thermostat shares part of its KNDy neuron pathway with perimenopausal hot flushes — one set of switches under two experiences.
Oestrogen helps the kidney clear urate, which is why premenopausal women run lower serum urate than men — and why the gap closes quickly after menopause. Same person, and the risk curve turns in those few years.
contrast · 2
Male hormonal ageing and menopause are not the same event: menopause is a cliff — oestrogen down over 90% within a few years, with a defined endpoint. The male curve is a slope; only about 2% meet the clinical definition of hypogonadism, and nine tenths of the fatigue filed under low testosterone is not about testosterone.
Two different periods routinely discussed as one: perimenopause is a 4-10 year transition of violent oestrogen swings and fluctuating hot flushes; postmenopause is a stable, lasting low-oestrogen state covering roughly a third of the rest of life. A swinging phase and a plateau call for different responses.