Air into middle ear: When you lift weights. Your abdominal muscles tighten the pressure in the back of your nose increases, driving air into the middle ear via the eustachian tube. This is a normal physiological phenomenon. This is the best explanation i can give you. However, if the force of the air is great enough when you lift too much weight, theoretically, you could perforate your ear drum. Be careful.
Answered 4/18/2014
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A doctor has provided 1 answer
A doctor has provided 1 answer
4 doctors weighed in across 2 answers
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