Can low androgen availability in postmenopausal women reduce energy, disrupt sleep, and weaken muscle-building response?

During the postmenopausal transition, the decline in circulating androgens significantly alters musculoskeletal health and neurological function.

Musculoskeletal preservation and mechanisms

• Androgens directly maintain lean tissue and support neuromuscular function by activating genomic androgen receptors and non-genomic PI3K/Akt-mTORC1 signaling pathways.
• Under normal conditions, this cascade phosphorylates downstream targets S6K1 and 4E-BP1 to drive translation initiation and muscle protein synthesis, while simultaneously downregulating key E3 ubiquitin ligases (atrogin-1 and MuRF1) to suppress muscle degradation.
• Low androgen availability reduces PI3K/Akt-mTORC1 activation, compromising neuromuscular junction morphology, pre- and postsynaptic acetylcholine receptor areas, and neurotrophins like BDNF and TrkB.
• Consequently, postmenopausal women experience a weaker muscle-building response and increased risk of sarcopenia; however, physiological DHEA supplementation significantly potentiates muscle hypertrophy and strength gains when paired with heavy resistance training.

Neurological and systemic signaling

• Within the central nervous system, androgens regulate neural plasticity and excitation-inhibition balance. Testosterone metabolites, including androstanediol and androsterone, act as neurosteroids that modulate GABA_A receptors to influence sleep-wake architecture and sedation.
• While androgen depletion is linked to subjective fatigue and sleep disturbances, clinical trials evaluating androgen replacement for energy and sleep report inconsistent outcomes. Sleep effects are highly individualized, often depending on the variable biotransformation of precursor DHEA into downstream testosterone and estradiol.

Bottom line

• Postmenopausal androgen decline directly impairs muscle-building capacity and neuromuscular integrity through reduced PI3K/Akt-mTORC1 signaling, though impacts on sleep and energy remain highly variable and dependent on individual hormone biotransformation.