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A 18-year-old female asked:

automatic atrial tachycardia with exercise? how do you differentiate from innapropriate sinus tachycardia? which would be more likely in an athlete?

1 doctor answer8 doctors weighed in
Dr. Mark Landers
Cardiac Electrophysiology 31 years experience
Tachycardia: Inappropriate sinus tachycardia - elevated heart rate (HR) at rest > 100 sitting/standing. Athletes usually have a slow HR at rest. Atrial tachycardia/fibrillation/flutter with excessive HR more common in extreme athletes with exercise. Cause unclear - may be due to electrical changes from extreme endurance exercise to atrial electrical properties of the heart. More exercise not always better.

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A 40-year-old female asked:

Why am I sometimes extremely dizzy after exercise? I work out frequently, eat well, drink more than 8x8 glasses of water a day.

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Can be other causes: Dizziness with exercise doesn't just happen with inadequate hydration. If a person is well hydrated, and still gets dizzy, her doctor can evaluate. Sometimes there are circulation problems, such as not enough blood flow to the brain under certain conditions or activities. There can be heart problems, or not enough red blood cells (anemia), etc...

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Last updated Oct 23, 2017

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