"Monitoring training load to understand fatigue in athletes." Sports medicine (Auckland, N.Z.) vol. Recovery of skeletal muscle contractility after high- and moderate-intensity strength exercise. Daily 1RM testing and squat performance across 30 consecutive training days in competitive powerlifters and a weightlifter. Prevention, diagnosis and treatment of the overtraining syndrome. The standard reference range lower limit of 15 ng/mL is likely too low; 30–50 ng/mL is a more appropriate floor for training athletes, though the upper end of that range remains debated and should be interpreted alongside symptoms.31 When these factors are improved, testosterone levels tend to recover. EHMC athletes continue to perform at a high level despite profoundly suppressed testosterone.1,20 In OTS, performance falls. In this study 85% of the OTS athletes produced peak cortisol that was lower than the adrenal insufficiency threshold of 18 μg/dL.18 Of note, 75% of the non-exercising controls showed the same response. The EROS study compared the HPA response in athletes meeting OTS criteria, as defined by a sustained performance reduction, to active individuals and non-exercising controls. The evidence is mechanistically plausible but does not replicate consistently across OTS studies, and acute post-exercise cytokine elevation resolves normally with adequate recovery. To date, no study has induced overtraining syndrome through lifting weights, at least not by the current definitions. Beyond its well-known influence on muscle mass, bone density, and red blood cell production, testosterone also impacts mood, energy levels, and cognitive function. Chronic endurance training—particularly when combined with inadequate caloric intake—can suppress testosterone through sustained cortisol elevation and energy deficit. Don’t let overtraining steal your vitality, performance, and quality of life. We look at every patient individually and design protocols that give your body the best chance to heal naturally—without relying solely on exogenous hormones unless medically indicated. Restoring hormonal balance after overtraining requires a multifaceted approach. This typically occurs after years of sustained overtraining without adequate recovery. In rare cases, athletes may develop a form of secondary hypogonadism where the HPG axis remains suppressed even after training load is reduced. Additionally, testosterone exhibits positive effects on erythropoiesis and hemoglobin concentrations (16). Many aspects of the above influences affect the male physiology advantageous for sporting performance. The pubertal effects also include enlargement of the sebaceous glands, penis enlargement, increased libido, increased frequency of erections, increased muscle mass development, deepening of the voice, increased height, bone maturation, loss of scalp hair, and growth of facial, chest, leg, and axillary hair. During this time a multitude of physiological changes occur; e.g., body odor develops, oiliness of the skin and hair increase, acne develops, accelerated growth spurts occur, and pubic, early facial, and axillary hair grow. The free and albumin-bound forms of testosterone constitute what is referred to as bioavailable testosterone (i.e., able to interact with androgenic receptors at target tissues). But overtraining and testosterone don’t always go hand in hand. These conclusions are in accord with previous studies examining overtraining, which have also had comparably small sample sizes 1,9. Mean (±SE) values of testosterone/cortisol ratio in overtrained (OVT) and control (CON) subjects in the Pre-training and Training periods When the OVT group developed their overtraining characterictics, both groups of athletes had blood samples withdrawn. During the course of the study four subjects exhibited signs and symptoms of overtraining. The serum samples were analyzed for testosterone (T), cortisol (C), luteinising hormone (LH), and prolactin (PRL) by standard radioimmunoassays as previously described . The intent of this study was to add to the sparse data available and to examine resting neuroendocrine status in overtrained athletes.
