Which of the following symptoms is associated with Over-Training Syndrome?

Over-Training Syndrome is characterized by a range of symptoms that arise from excessive training without adequate recovery. One of the primary symptoms associated with this condition is weight loss and sleep disruption.

When an individual is overtraining, the body experiences chronic stress, leading to an imbalance in hormonal levels, particularly cortisol, which can contribute to weight loss. This increased stress can also affect sleep patterns, causing insomnia or poor-quality sleep. Disturbances in sleep not only exacerbate fatigue but can further hinder recovery, creating a cycle of worsening symptoms.

The other choices do not align with the effects of Over-Training Syndrome. Increased muscle mass and improved performance would generally indicate that a training regimen is effective, not detrimental. Similarly, weight gain is not a common symptom associated with overtraining; instead, individuals often experience fatigue and other negative effects due to their training regimen being too intense or frequent without sufficient rest.