GLOSSARY

Hydration Status Classification Table

Hydration assessment combines measures; no single urine or scale value establishes all body-fluid compartments.

Hydration Status is the body's water state at assessment, interpreted using markers and individual circumstances.

Body water is not completely fixed: drinking, food, excretion and activity change it. Hypohydration describes a reduced-water state, whereas dehydration can describe the process producing it, although everyday usage overlaps. Athletes benefit from starting suitably hydrated and avoiding substantial deficits or excessive intake. The terminology does not require chasing a single unchanging water value throughout every session.

Fluid needs depend on body size, exercise duration and intensity, clothing, environment and access. A fixed prescription for everyone, or automatically adding water whenever fatigue appears, misses these differences. Records from comparable sessions, drinking, body-mass changes and gut tolerance guide adjustments. A plan for a hot endurance session does not automatically fit a short cool workout.

No single field marker precisely captures every aspect of hydration at all times. Trends in mass, thirst, urine and drinking history are more interpretable together than as isolated observations. Standardize sampling time and comparison conditions. Screening identifies a need for further review; one color, number or device message does not establish a diagnosis or justify forcing excessive fluid intake.