title: Ask the doctor.  I am a healthy 52 year old who likes to stay fit.  Recently, I have occasionally fainted after doing eight or 10 chin-ups.  My physician did an EKG and stress test the first time this happened and found my heart is normal.  He had me wear a monitor for 24 hours, and it indicated nothing was wrong.  Your thoughts?
authors: Thomas
authors: T
authors: Lee
authors: Richard
authors: R
authors: Lee
mesh_terms: D001145:Arrhythmias, Cardiac / Q000175:diagnosis; D001794:Blood Pressure; D004562:Electrocardiography; D015716:Electrocardiography, Ambulatory; D005080:Exercise Test; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D012119:Respiration; D013575:Syncope