Hypothalamic-Pituitary-Testicular Axis Disruptions in Older Men Are Differentially Linked to Age and Modifiable Risk Factors: The European Male Aging Study: The Journal of Clinical Endocrinology & Metabolism: Vol 93, No 7 - 0 views
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0.4–2% annual decline
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the age trend in free T was more substantial (−1.3% per annum)
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The core hormonal pattern with increasing age is suggestive of incipient primary testicular dysfunction with maintained total T and progressively blunted free T associated with higher LH.
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Age induced decline in Testosterone is more associated with a decline in leydig cell function and thus elevated LH will be associated. In contrast, obesity is more of a HPA axis disruption and thus LH may be normal to low. The pulse amplitude is decrease. No change in pulse frequency is noted. With obesity, a decline in TT and fT was independent of SHBG. Aging is associated with a greater decrease in fT versus TT.