Spectrum of electrocardiographic changes during exercise testing

A: Normal resting electrocardiogram (lead V5) before exercise; B: Normal J point depression during exercise; C: Upsloping ST depression of subendocardial ischemia; D: Horizontal ST depression of subendocardial ischemia; E: Downsloping ST depression of subendocardial ischemia; F: ST elevation caused by transmural ischemia; G: U wave inversion.