Why is my heart rate higher when I travel?
Why is my heart rate higher when I travel? High Variability At sea level, oxygen saturation hovers around 98 to 100 percent, but at 14,000 feet, the saturation levels drops to 80 percent due to oxygen-poor air, requiring the heart to increase cardiac output, requiring a 10 to 30 percent increase in heart rate to maintain appropriate oxygen delivery to tissues.
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