Does aerobic exercise improve fitness and heart rate variability after an implantable cardioverter defibrillator?
Sudden cardiac arrest survivors who have an ICD are a group of cardiac patients who can potentially benefit the most from exercise by stabilizing autonomic function and reducing the incidence of arrhythmias. Although causal conclusions cannot be drawn from this study, further testing of aerobic exercise interventions in this population appears warranted.
During head elevation the arteriovenous pressure gradient is the major determinant of CBF. The influence of CPP on CBF decreases from 0 to 45 degrees of head elevation.