CSSD Practice Exam 2026 – Complete Study Resource

The impact of 1% dehydration primarily manifests as an increase in body temperature. When the body is dehydrated, its ability to regulate temperature effectively is compromised. This is particularly significant during physical activities, where the body's sweating mechanism is crucial for cooling down. A slight increase in dehydration can hinder the body's thermoregulation, leading to a rise in core temperature.

This physiological alteration occurs because adequate hydration is essential for maintaining blood volume and circulation, which are critical for dissipating heat. Consequently, even a 1% deficit in hydration can make it more challenging for the body to dissipate heat properly, resulting in an increase in body temperature.

While increased fatigue, decrease in physical performance, and reduction in cognitive ability are all potential effects of dehydration, they typically become more pronounced with higher levels of fluid loss. At just 1% dehydration, the most immediate impact felt would be the elevation of body temperature.