-Exercise improves insulin resistance and has beneficial effects in preventing and treating type 2 diabetes. However, aerobic exercise is hindered in many type 2 diabetic patients because of advancing age, obesity, and other comorbid conditions. Weight lifting or progressive resistance training (PRT) offers a safe and effective exercise alternative for these people. PRT promotes favorable energy balance and reduced visceral fat deposition through enhanced basal metabolism and activity levels while counteracting age-and disease-related muscle wasting. PRT improves insulin sensitivity and glycemic control; increases muscle mass, strength, and endurance; and has positive effects on bone density, osteoarthritic symptoms, mobility impairment, self-efficacy, hypertension, and lipid profiles. PRT also alleviates symptoms of anxiety, depression, and insomnia in individuals with clinical depression and improves exercise tolerance in individuals with cardiac ischemic disease and congestive heart failure; all of these aspects are relevant to the care of diabetic elders. Moreover, PRT is safe and well accepted in many complex patient populations, including very frail elderly individuals and those with cardiovascular disease. The greater feasibility of using PRT over aerobic exercise in elderly obese type 2 diabetic individuals because of concomitant cardiovascular, arthritic, and other disease provides a solid rationale for investigating the global benefits of PRT in the management of diabetes.
Diabetes Care 26:1580 -1588, 2003ADVANCING AGE AND TYPE 2 DIABETES -The value of tight blood glucose control in type 2 diabetes has been convincingly demonstrated in the U.K. Prospective Diabetes Study, among other studies. Improvement in glycemic control per se, irrespective of the means of attaining this, is the critical factor in reducing the risk of chronic diabetic complications (1). Gaining and maintaining good glycemic control hinges on enhancing insulin availability or secretion and overcoming insulin resistance. Unfortunately, advancing age, central obesity, and physical inactivity hinder medical management and may hasten development of chronic complications, particularly in elderly people who may have lived with diabetes for decades. Even when glycemic control is near optimal with medication, reducing insulin resistance by any other means must be explored in view of these adverse consequences (1).Because skeletal muscle is the biggest reservoir for glucose disposal (2), muscle wasting from aging and inactivity exacerbate problems of peripheral glucose uptake. Muscle weakness, decreased muscle mass, decreased activation of glycogen synthase, and changes in type IIb skeletal muscle fiber numbers are related to and may precede insulin resistance, glucose intolerance, and type 2 diabetes (3-5). Visceral fat deposition in older adults may be causally related to elevated cortisol secretion in response to stressors (6). Thus, decreased muscle mass, increased visceral adiposity, and the typical decline in physical activity...