Pilot body signals under the microscope in altitude study

This study looked at how low oxygen levels (like at high altitudes) affect pilots' bodies and their ability to fly. Seventeen healthy volunteers who met Navy body standards flew in a flight simulator while breathing normal air or air mimicking 8,000 or 12,000 feet. Researchers measured heart rate, blood pressure, oxygen levels, skin responses, and neck muscle activity, and asked about symptoms and workload. The goal was to understand which body processes are most affected by sudden versus gradual altitude changes.