Friday, 6 April 2018

EKG of a 70-year-old man with exercise intolerance
Exercise intolerance - and not just exercise in the sports sense, but the difficulties can exist with any activity: depending on severity, even attepting to sit up can be too much - is a frequent symptom of Myalgic Encephalomyelitis and the overlapping condition of Orthostatic intolerance (OI). 
Exercise intolerance is a condition of inability or decreased ability to perform physical exercise at what would be considered to be the normally expected level or duration. It also includes experiences of unusually severe post-exercise pain, fatigue, nausea, vomiting or other negative effects. Exercise intolerance is not a disease or syndrome in and of itself, but can result from various disorders.

Intolerance to exercise may be caused by unusual breathlessness (dyspnea), muscle pain (myalgia), tachypnoea (abnormally rapid breathing), tachycardia (having a faster heart rate than normal) or increasing muscle weakness; or exercise might result in severe headache, nausea, dizziness, occasional muscle cramps or extreme fatigue, which would make it intolerable.

From Wikipedia: Exercise intolerance

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