16Low intensity, <4 METS. Moderate intensity, 4-6 METS. High intensity, >6 METS. HCM indicates hypertrophic cardiomyopathy; ICD, implantable cardioverterdefibrillator; LQTS, long QT syndrome; and METS, metabolic equivalent value.*Involves potential for traumatic injury, especially during times of impaired consciousness, for example, because of ICD shock. by guest on May 9, 2018 http://circgenetics.ahajournals.org/ Downloaded from
Circ Cardiovasc GenetFebruary 2015 advising restrictions on certain physical activities depending on the underlying genetic heart disease. Both the American College of Cardiology (ACC) in conjunction with the American Heart Association (AHA) and the European Society of Cardiology (ESC) have sought to address this issue and have released various recommendation documents, a summary of which is provided in Figure 1. 14,15,29 Although there is a paucity of strong evidence to guide these recommendations, there is a consensus view that maintaining low to moderate intensity activity is important to avoid health burdens associated with physical inactivity.The ACC/AHA recommendations seek to address the conflict between the risk of high-intensity exercise and the risk of a sedentary lifestyle, although also acknowledging the desire of patients to participate in exercise. 15 They specifically focus on patients involved in recreational sports (ie, noncompetitive athletes) and reinforce that patients with a genetic heart disease can still gain some benefit from exercise and sports participation, highlighting the importance of maintaining physical and psychological well-being in this young patient group. Furthermore, an additional recommendations document has focused specifically around competitive athletes engaged in systematic training and competition, where there is emphasis on achievement. 30 An underlying difference is assumed between competitive athletes and recreational participants that necessitates separate recommendations, namely, that nonathletes have greater opportunity to exert reasonable control over their level of exercise and therefore are more likely to reliably detect cardiac symptoms and wilfully terminate physical activity. 15 The ACC/AHA recommendations for those involved in noncompetitive activities categorize a selection of common sports based on the degree of physiological exertion, measured in METS. Recommendations are made for HCM, LQTS, ARVC, and Brugada syndrome patients for each sport, taking into account the characteristics of each condition. Table 1 illustrates a selection of sports and activities, their corresponding intensity measured in METS (categorized according to low, moderate, and high MET values) and the recommendation regarding participation for individuals with HCM and LQTS. The core principle underlying this document is that patients with genetic cardiovascular disease can safely participate in most forms of recreational exercise judged to be of moderate or low intensity. 15 Avoidance of several activities and environmental factors that may increase the lik...