The goal of this clinical trial is to evaluate whether hydrogen-rich water supplementation during tapering improves recovery after functional overreaching in competitive male basketball players aged 18-35 years. The main questions it aims to answer are:

• Does hydrogen-rich water improve autonomic recovery after functional overreaching?
• Does hydrogen-rich water improve recovery in biochemical, performance, and subjective feeling outcomes during tapering?

Researchers will compare hydrogen-rich water to placebo (water containing no molecular hydrogen) to determine whether molecular hydrogen improves recovery after accumulated fatigue has been induced by functional overreaching. Participants will:

• Complete a training cycle including normal training, functional overreaching, and tapering.
• Consume hydrogen-rich or placebo water daily during the one-week tapering period.
• Undergo repeated testing of autonomic nervous system, blood biochemical markers, performance, and subjective soreness.