GLOSSARY

Dehydration and Thermoregulation concerns the potential strain of water deficit on temperature regulation, dependent on environment and activity.

Sweat directly cools when it evaporates from the skin; dripping does not produce the same heat removal. High humidity and poorly permeable clothing limit evaporation even on wet skin. Heavy sweating alone therefore does not prove adequate cooling. Adjust intensity, breaks, shade and cooling to conditions. Hydration is one part of heat management rather than a complete defense against excessive heat strain.

Heat stress describes the load from environment, metabolic heat and clothing; thermal strain describes bodily responses such as rising temperature and heart rate. Record the distinction. Core temperature differs from skin temperature or perceived warmth. Confusion or poor coordination in heat is serious: prompt assessment and cooling should not be delayed while waiting for ordinary drinking or routine measurements to solve the problem.

Reduced body water can increase cardiovascular and heat-dissipation demands, especially during prolonged hot exercise. Adequate hydration does not guarantee protection against heat illness; intensity, acclimation and environment still matter. Not every performance decline or temperature rise is caused solely by dehydration. Continuing to drink should never substitute for recognizing excessive strain, reducing exposure and obtaining appropriate assessment when warning signs occur.