Chronic heart failure is characterised by skeletal myopathy with reduced muscle mass, decreased vascular density and conductance, and impaired muscle oxidative capacity. This results in a shift toward type-II
muscle fibres (Duscha et al 1999, Harrington and Coats, 1997, Hulsmann et al 2004, Sunnerhagen et al 1998). These abnormalities may lead to disuse atrophy, further inactivity, and even cachexia. This progressive weakness has been noted in people with chronic heart failure and correlated with the severity of disease and exercise capacity (Hulsmann et al 2004, Toth et al 1997), suggesting that www.selleckchem.com/products/lee011.html resistance training may help to ameliorate peripheral muscle weakness in chronic heart failure. Moreover, muscular strength is reported as a predictor of long-term survival in chronic heart failure (Hulsmann
et al 2004). Resistance training has been considered in people with chronic heart failure recently because it imposes less cardiac demand than aerobic exercise (King et al 2000, McKelvie et al 1995, Meyer et al 1999). Several studies have established the safety of resistance exercise (Braith and Beck, 2008, Braith et al 2005, Cheetham et al 2002, Jennings and Esler, 1990, Magnusson et al 1996, Meyer, 2006, Volaklis and Tokmakidis, 2005, Williams et al 2007a, Williams et al 2007b). The American College of Sports Medicine has recommended that people with cardiac disease should add resistance training Selleck Dorsomorphin to their exercise program (Thompson et al 2010). However, the use of resistance training by people with chronic heart failure is controversial and its use in clinics remains limited because of uncertainty about its benefits and risks (Elkayam et al 1985). In the past decade, resistance training has been proven to improve both muscle strength and functional
capacity in individuals with chronic heart failure. It can improve static as well as Non-specific serine/threonine protein kinase dynamic muscular strength by increasing the cross-sectional area of local muscle (Magnusson et al 1996). Furthermore, skeletal muscle adapts metabolically to resistance training in people with chronic heart failure (Minotti et al 1990). Some studies showed definite improvement in muscle strength, peak oxygen consumption and quality of life after resistance training, although there were no beneficial effects on left ventricular function (Levinger et al 2005a, Levinger et al 2005b). One study of 14 high-risk chronic heart failure patients demonstrated an average of 26% improvement in muscle strength after adding an 8-week resistance training regimen to aerobic training (Barnard et al 2000). There is even some evidence in chronic heart failure patients that resistance training added to aerobic training can improve heart function, exercise tolerance and quality of life more than aerobic training alone (Degache et al 2007, Maiorana et al 2000a).