Can high training load with inadequate recovery lower DHEA‑S and suppress reproductive hormones?

High training volume combined with inadequate recovery periods significantly increases physiological stress markers and is associated with suppressed levels of adrenal and reproductive hormones in women.

Clinical evidence

• Allostatic Load and Systemic Wear: High training loads that lack sufficient recovery intervals increase "allostatic load"—the cumulative wear and tear on the body's regulatory systems. While moderate exercise is protective, chronic overreaching leads to a state where the body's adaptive mechanisms (the HPA and HPG axes) become perpetually activated, resulting in maladaptations across metabolic, cardiovascular, and immune functions.
• Adrenal Androgen Suppression: Research indicates that sustained high-volume training is linked to lower levels of DHEA-S. While acute exercise causes a temporary spike in adrenal androgens, chronic stress from excessive training can lead to a state of functional adrenal suppression. Studies show that basal DHEA-S levels can be significantly lower in athletes experiencing overtraining compared to those with balanced recovery. This effect is often driven by a "cortisol steal" or a shift in adrenal output that prioritizes glucocorticoids (cortisol) over androgenic precursors.
• Reproductive Hormone Signaling: The suppression of reproductive hormones is well-documented within the Relative Energy Deficiency in Sport (RED-S) framework. High training loads frequently create states of low energy availability (LEA), which the brain interprets as a threat to survival. This leads to a reduction in the pulsatile release of Gonadotropin-Releasing Hormone (GnRH), subsequently lowering Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH), which results in lower estradiol and progesterone levels.

Mechanistic explanations

• Hypothalamic Suppression: The hypothalamus serves as the integrator of energy and stress signals. High training loads reduce levels of leptin (a satiety hormone) and insulin, while increasing ghrelin and cortisol. This metabolic environment inhibits kisspeptin neurons, which are the primary drivers of GnRH secretion.
• HPA-HPG Interaction: Chronic HPA axis activation due to physical stress directly inhibits the reproductive axis. High cortisol levels can suppress the sensitivity of the pituitary gland to GnRH and reduce the sensitivity of the ovaries to LH and FSH.
• Substrate Prioritization: Under chronic stress, the adrenal glands may prioritize the production of cortisol to manage the stress load at the expense of DHEA and its sulfate form, DHEA-S, potentially reducing the anabolic support needed for recovery.

Considerations for women age 45+

• Perimenopausal Context: For women in their mid-40s, the natural decline in ovarian function and the onset of perimenopause may increase susceptibility to training-induced hormonal disruption. The baseline increase in allostatic load during this transition can make the body more sensitive to inadequate recovery.
• Compounded Effects: The age-related decline in DHEA-S (adrenopause) can be accelerated or exacerbated by high-load training, potentially impacting muscle maintenance, mood, and cognitive function more significantly than in younger populations.

Bottom line

High training load without adequate recovery increases allostatic load and triggers a multi-system endocrine response characterized by lower DHEA-S and suppressed reproductive hormones (LH, FSH, and estradiol). This state is primarily driven by hypothalamic inhibition in response to chronic physical stress and potential energy deficits.