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.
Competitive male basketball players.
Signed informed consent.
Completion of entry medical and laboratory screening.
Acute injury or infection.
History or presence of relevant cardiovascular, respiratory, metabolic, or other disease that may affect the study results.
Use of medication affecting recovery markers or study results.
Parallel
Hydrogen-rich water
Dietary supplementHydrogen-rich water with molecular hydrogen concentration \>1.0 ppm.
Placebo water
Dietary supplementTap water without molecular hydrogen.
RMSSD
The root mean square of successive differences of RR intervals (RMSSD) is used as an index of parasympathetic activity and is calculated from an ECG using heart rate variability analysis.
Creatine kinase
Blood creatine kinase concentration is used as a marker of muscle damage.
High-sensitivity C-reactive protein
High-sensitivity C-reactive protein concentration is used as a marker of systemic inflammatory.
Cortisol
Blood cortisol concentration is used as a marker of physiological stress response.
Testosterone
Blood testosterone concentration is used as a marker related to anabolic-catabolic balance.
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