[Advancement of management of arrhythmias associated with exercise testing]

Exercise-induced isolated premature contractions occur in healthy subjects, as well as in patients with cardiac disease. On the other hand, the prevalence of exercise-induced supraventricular or ventricular tachycardia is uncommon among most healthy subjects in usual clinical laboratory settings. Significant coronary heart disease may be found in patients who reveals ventricular arrhythmias during the phase of graded exercise testing. The absence of increase of heart rate during submaximal exercise usually suggests sinus node dysfunction. Exercise testing is of value when it comes to assessing the site of AV block in patients with atrioventricular (AV) block. Exercise testing is also useful to clarify arrhythmic implications for various exercise-related complaints and may help to assess risk strafication and effects of interventions. The clinical significance of induction or suppression of arrhythmia during exercise still remains to be investigated.