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You’ve been training consistently for months. Overtraining syndrome is a poorly defined and rarely demonstrated condition that can only be diagnosed after ruling out more common explanations. Here is what that means, and what to do when your training is actually not working. If you’re constantly exhausted, irritable, losing morning wood, and performance is dropping, you’re not just tired — you’re overtrained. However, most men can recover fully with proper rest, nutrition, and hormonal support.
The effects we’re talking about here are seen mainly in endurance athletes, competitive sportsmen, and men training at high volumes for years. After all, exercise is supposed to boost testosterone, right? And for men who regularly train at extreme intensity and volume, consistently going beyond that limit may quietly chip away at one of their most important hormones. The response of the HPG axis to a stressor also appears to be blunted following periods of intensified training (i.e. overtraining). Measurement of the hormone cortisol or its precursor adrenocorticotrophic hormone (ACTH) provides an indicator of HPA activity. The hypothalamic-pituitary-adrenal (HPA) and hypothalamic-pituitary-gonadal (HPG) axes have been reported to be affected by overtraining. But research that specifically examines how often the average person experiences overtraining is scarce.
High-volume strength training will lower testosterone levels; but high-intensity might not. But here’s the interesting thing regarding overtraining and testosterone… One of the only studies (from way back in 1997) looking at bodybuilding-type training tested athletes after a brutal repeated 1RM workout. If you hack your way through the hundreds of studies on overtraining and testosterone, you’ll find that there’s a glaring missing link… Our results demonstrate that endurance athletes who exhibit overtraining characteristics have lowered T and elevated PRL levels.
The sustainability of exercise-induced elevation of testosterone concentrations may not vary between endurance and resistance exercise; however, the underlying mechanisms may be different. In contrast, anaerobic exercise-induced stimulation of testosterone production was explained by the effect of the anaerobic glycolytic pathway on the release of gonadotropin releasing hormone (GnRH) and LH . However, a 45 min physiological lag between the LH pulse and testosterone production was well established , and thus LH stimulation may not be the mechanism responsible for the increase in plasma testosterone concentrations with exercise. Cumming et al. showed that both testosterone and luteinizing hormone (LH) synchronously peaked at 20 min of progressive intensity exercise on an ergometer.
So, if your testosterone levels are low, you might not be performing at your peak. Testosterone also contributes to the body’s maintenance of energy levels, so this hormone can increase your energy during workouts and help improve your endurance. Optimal levels of this hormone are necessary to create and preserve bone density; without enough testosterone, bones can become weak and more likely to fracture or break. If your testosterone is low, InsideTracker recommends tailor-made interventions to help you increase your levels, including lifestyle, training, and nutrition modifications. Overtraining syndrome goes beyond affecting performance; it also takes a toll on mental health, hormonal balance, and immune system function.
For most men training at a recreational level, the benefits far outweigh any risk to testosterone. If you’re training hard and noticing these signs, it’s worth considering whether your body is waving a red flag. Many won’t even notice the hormonal shift until symptoms like performance decline or mood changes start interfering with their daily life.1,3 In men, RED-S can mean low testosterone, suppressed libido, poor recovery, brittle bones, and mental fatigue.
Within a month, morning erections returned, his mood improved, and his testosterone levels started to rise again. Low free T with high cortisol is another sign of overtraining. Check your total and free testosterone, LH, FSH, SHBG, and cortisol levels.
The systematic search was expanded beyond the PRISMA guidelines for systematic reviews in order to achieve all the studies that correlate hormone levels and OTS/NFOR/FOR, due to the wide variety of expressions and study designs. When acute hormones responses were analyzed together with the resting levels of induced NFOR/FOR, the only marker that showed mostly altered levels was aldosterone. From the 38 studies, 21 (55.2%) performed more than one type of comparison (eg. Analysis between basal levels of the same affected athletes and also between affected and healthy athletes).
Testosterone (T) is a steroid hormone that is present in the bodies of both men and women. » Uncover the science behind testosterone biomarkers Indicators include a sudden drop in performance, fatigue, and trouble sleeping.

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