Why does my heart rate increase on an airplane?

The effects of altitude: The air pressure and oxygen levels in an airplane cabin are different from those at ground level. This change in altitude can cause your heart rate to increase as your body adjusts to the new conditions.



Excellent question! It’s very common for people to experience an increased heart rate on an airplane, and it’s usually due to a combination of physiological and psychological factors. Here’s a breakdown of the main reasons:

1. Psychological Factors (The Most Common Cause)

  • Anxiety and Stress: For many, flying is a significant source of stress. The anticipation, the noise, turbulence, and the feeling of being in an enclosed space can trigger the body’s “fight-or-flight” response. This releases adrenaline (epinephrine), which directly increases your heart rate, blood pressure, and alertness.
  • Fear of Flying (Aviophobia): A more intense form of anxiety that can cause pronounced physical symptoms, including a racing heart, sweating, and shortness of breath.

2. Physiological Factors (Your Body’s Response to the Environment)

  • Lower Cabin Oxygen Levels (Hypoxia): While airplane cabins are pressurized, the air pressure is equivalent to being at 6,000–8,000 feet above sea level. At this “altitude,” the partial pressure of oxygen is lower. To deliver the same amount of oxygen to your tissues, your heart needs to pump more blood, leading to a slight increase in heart rate. For most healthy people, this is minor, but it can be more noticeable if you have an underlying heart or lung condition.
  • Dehydration: The air in airplane cabins is extremely dry (often 10-20% humidity). You lose moisture through your breath and skin without noticing. Dehydration reduces blood volume, making your heart work harder to circulate blood, which can elevate your heart rate.

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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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Air travel itself does not cause paroxysmal supraventricular tachycardia, atrial fibrillation, or atrial flutter. Patients who are asymptomatic or symptomatically stable should not be restrict- ed from flying.

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The cramped conditions and long periods of being less active on a flight can cause pain, stiffness or swelling of your legs. Being less active can lead to slow blood flow in your veins which increases your risk of developing a blood clot, known as deep vein thrombosis (DVT). DVTs most commonly form in the legs.

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Cardiac arrhythmia. Hypoxia and increased sympathetic activation may increase the risk of cardiac arrhythmias at high altitude2; however, the incidence of significant arrhythmias during air travel is rare.

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Unstable heart disease is associated with a higher risk of adverse events due to flying, and you may need to avoid flying, at least temporarily, until your condition is well controlled. People with pacemakers or implantable defibrillators can fly safely.

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By itself, tachycardia is not a sign of danger; unless it reaches an extremely high rate such as over 180 beats per minute, which far exceeds the rates that occur during the fight-or-flight response (120-130 beats per minute). Vigorous physical exercise increases your heart rate to around 150 to 180 beats per minute.

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Choose a seat in the middle of the plane. As the air circulates across the rows and not up and down the plane, some experts believe the worst air is in the front or the back of the plane. Stay well hydrated by drinking lots of fluids (water or fruit juice) and avoiding caffeine and alcohol, which will dehydrate you.

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If your blood pressure is higher than 120 over 80, seek medical advice before you travel.

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Air pressure is lower at higher altitudes, which means your body takes in less oxygen. Airlines “pressurize” the air in the cabin, but not to sea-level pressures, so there's still less oxygen getting to your body when you fly, which can make you feel drained or even short of breath.

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