Dehydration in Pilots

As we enter another Queensland summer with hot and humid weather conditions it is a timely reminder to discuss the risks associated with dehydration in pilots.

Hydration is critical for pilots as it directly impacts cognitive and physical performance, which are essential for flight safety. Dehydration can lead to fatigue, impaired judgment, reduced reaction time, confusion, dizziness and can be mistaken for hypoxia. Conditions like hot cockpits, low cabin humidity, and bright sunlight at altitude accelerate fluid loss, making it crucial for pilots to maintain high fluid intake before, during, and after flights. 

Factors that increase dehydration risk for pilots

• Environmental conditions such as hot weather on the ground and cockpit temperature and humidity.

• Physiological stress with the combination of physical and mental stress during flight accelerating the body's need for fluids.

• Flight factors such as flying above the clouds exposing pilots to bright sunlight, while long flights mean prolonged periods with potential for dehydration. 

Tips for staying hydrated

• Hydrate before, during, and after your flight, start hydrating days before a flight and continue throughout the flight, replenishing fluids even after landing.

• Drink consistently during the flight.

• Avoid dehydrating beverages such as alcohol and caffeine.

• Monitor your body and don't wait until you feel thirsty, as thirst indicates you are already dehydrated. Pay attention to other signs like headaches and fatigue.

• Consider an electrolyte supplement or sports drinks for hot days or long flights.

Further Reading

For more information read this very interesting article in the Airservices Australia safety magazine

Flight Safety Australia in May-June 2010 - "Don’t sweat and Forget" by Doctor and Pilot Ken Wishaw.

10. H.F. - Dehydration - Don't sweat and forget.pdf

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