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Representative 2-D image sequence during exercise for left ventricular (LV) longitudinal strain (Sl). A: rest at heart rate (HR) = 86 bpm; B: 0 W at HR = 100 bpm; C: 50 W at HR = 108 bpm; D: 100 W at HR = 148 bpm; E: 2-min recovery at HR = 74 bpm. GS = global LV Sl.
