What is a physiological symptom associated with performance overtraining?

The selection of poor sleep as a physiological symptom associated with performance overtraining is supported by the understanding that overtraining can disrupt normal physiological functions and recovery processes. When athletes or individuals engage in excessive training without adequate rest, their bodies can experience heightened stress levels, which may lead to insomnia or difficulties in achieving restful sleep. This lack of restorative sleep can further impact overall performance, mood, and recovery, creating a cycle that exacerbates overtraining symptoms.

Other options like increased energy levels, muscle hypertrophy, and enhanced mood are typically associated with well-managed training programs that include adequate recovery. In contrast, overtraining often results in fatigue, decreased performance, and disturbances in sleep patterns, confirming that poor sleep is a significant indicator of overtraining.