Before revision: In a person who does not tolerate exercise well, physical activity may cause 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.
After revision: In a person who does not tolerate exercise well, physical activity may cause unusual breathlessness (dyspnea), muscle pain (myalgia), tachypnoea (abn,inappropriate rapid heart rate oror muscle fatiguemally 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.