The Altitude Factor

Did I actually swim better than I thought in Park City yesterday when you factor in the altitude difference? Park City is 6900 feet vs. Salt Lake's 4,330. This paragraph from Park City's tourism page also makes me wonder if it was partly the altitude and not just anxiety that made me very thirsty and somewhat nauseated yesterday.

Park City is located at 6,900 feet (2,103 meters) above sea level and rises to above 10,000 feet (3,220 meters). Some guests may experience altitude sickness. The symptoms of altitude sickness are headaches, nausea, fatigue and/or shortness of breath. Altitude sickness generally disappears within 48 hours. Altitude sickness is almost entirely preventable and can be significantly minimized when the following guidelines are followed: exercise in moderation the first few days; drink more water than usual; reduce alcohol intake - which has a greater effect at this altitude; eat food high in carbohydrates and avoid salty foods.

Found while looking for something else:
Three Perfect Days - Salt Lake