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CAN EXERCISE CURE DIABETES?Exercise and diabetes -
A careful medical history and physical examination should focus on the symptoms and signs of disease affecting the heart and blood vessels, eyes, kidneys, feet, and nervous system.
A graded exercise test may be helpful if a patient, about to embark on a moderate- to high-intensity physical activity program Table 1 4 — 6 , is at high risk for underlying cardiovascular disease, based on one of the following criteria:.
Presence of microvascular disease proliferative retinopathy or nephropathy, including microalbuminuria. In some patients who exhibit nonspecific electrocardiogram ECG changes in response to exercise, or who have nonspecific ST and T wave changes on the resting ECG, alternative tests such as radionuclide stress testing may be performed.
Patients with known coronary artery disease should undergo a supervised evaluation of the ischemic response to exercise, ischemic threshold, and the propensity to arrhythmia during exercise.
In many cases, left ventricular systolic function at rest and during its response to exercise should be assessed. Evaluation of peripheral arterial disease PAD is based on signs and symptoms, including intermittent claudication, cold feet, decreased or absent pulses, atrophy of subcutaneous tissues, and hair loss.
The basic treatment for intermittent claudication is nonsmoking and a supervised physical activity program. The presence of a dorsalis pedis and posterior tibial pulse does not rule out ischemic changes in the forefoot.
If there is any question about blood flow to the forefoot and toes on physical examination, toe pressures as well as Doppler pressures at the ankle should be carried out.
For patients who have proliferative diabetic retinopathy PDR that is active, strenuous activity may precipitate vitreous hemorrhage or traction retinal detachment.
These individuals should avoid anaerobic exercise and physical activity that involves straining, jarring, or Valsalva-like maneuvers. On the basis of the Joslin Clinic experience, the degree of diabetic retinopathy has been used to stratify the risk of physical activity and to individually tailor the physical activity prescription.
Patients with overt nephropathy often have a reduced capacity for physical activity, which leads to self-limitation in activity level. Although there is no clear reason to limit low- to moderate-intensity forms of activity, high-intensity or strenuous physical activity should probably be discouraged in these individuals unless blood pressure is carefully monitored during exercise.
Peripheral neuropathy PN may result in loss of protective sensation in the feet. Significant PN is an indication to limit weight-bearing exercise. Repetitive exercise on insensitive feet can ultimately lead to ulceration and fractures.
Evaluation of PN can be made by checking the deep tendon reflexes, vibratory sense, and position sense. Touch sensation can best be evaluated by using monofilaments. The inability to detect sensation using the 5.
Table 3 lists contraindicated and recommended physical activity for patients with loss of protective sensation in the feet. Sudden death and silent myocardial ischemia have been attributed to CAN in diabetes. Resting or stress thallium myocardial scintigraphy is an appropriate noninvasive test for the presence and extent of macrovascular coronary artery disease in these individuals.
Hypotension and hypertension after vigorous physical activity are more likely to develop in patients with autonomic neuropathy, particularly when starting a physical activity program. Because these individuals may have difficulty with thermoregulation, they should be advised to avoid physical activity in hot or cold environments and to be vigilant about adequate hydration.
Preparing the individual with diabetes for a safe and enjoyable physical activity program is as important as physical activity itself. The young individual in good metabolic control can safely participate in most activities.
The middle-aged and older individual with diabetes should be encouraged to be physically active. The aging process leads to a degeneration of muscles, ligaments, bones, and joints, and disuse and diabetes may exacerbate the problem. Before beginning any physical activity program, the individual with diabetes should be screened thoroughly for any underlying complications as described above.
A standard recommendation for diabetic patients, as for nondiabetic individuals, is that physical activity includes a proper warm-up and cool-down period. A warm-up should consist of 5—10 min of aerobic activity walking, cycling, etc.
at a low-intensity level. The warm-up session is to prepare the skeletal muscles, heart, and lungs for a progressive increase in exercise intensity. After a short warm-up, muscles should be gently stretched for another 5—10 min. Primarily, the muscles used during the active physical activity session should be stretched, but warming up all muscle groups is optimal.
The active warm-up can either take place before or after stretching. After the activity session, a cool-down should be structured similarly to the warm-up. The cool-down should last about 5—10 min and gradually bring the heart rate down to its pre-exercise level.
There are several considerations that are particularly important and specific for the individual with diabetes. Aerobic physical activity should be recommended, but taking precautionary measures for physical activity involving the feet is essential for many patients with diabetes.
The use of silica gel or air midsoles as well as polyester or blend cotton-polyester socks to prevent blisters and keep the feet dry is important for minimizing trauma to the feet. Proper footwear is essential and must be emphasized for individuals with PN.
Individuals must be taught to monitor closely for blisters and other potential damage to their feet, both before and after physical activity.
A diabetes identification bracelet or shoe tag should be clearly visible when exercising. Proper hydration is also essential, as dehydration can affect blood glucose levels and heart function adversely. Physical activity in heat requires special attention to maintaining hydration.
Adequate hydration prior to physical activity is recommended e. During physical activity, fluid should be taken early and frequently in an amount sufficient to compensate for losses in sweat reflected in body weight loss, or the maximal amount of fluid tolerated.
Precautions should be taken when exercising in extremely hot or cold environments. High-resistance exercise using weights may be acceptable for young individuals with diabetes, but not for older individuals or those with long-standing diabetes. Moderate weight training programs that utilize light weights and high repetitions can be used for maintaining or enhancing upper body strength in nearly all patients with diabetes.
The possible benefits of physical activity for the patient with type 2 diabetes are substantial, and recent studies strengthen the importance of long-term physical activity programs for the treatment and prevention of this common metabolic abnormality and its complications.
Specific metabolic effects can be highlighted as follows. Several long-term studies have demonstrated a consistent beneficial effect of regular physical activity training on carbohydrate metabolism and insulin sensitivity, which can be maintained for at least 5 years.
It remains true, unfortunately, that most of these studies suffer from inadequate randomization and controls, and are confounded by associated lifestyle changes. Data on the effects of resistance exercise are not available for type 2 diabetes although early results in normal individuals and patients with type 1 disease suggest a beneficial effect.
It now appears that long-term programs of regular physical activity are indeed feasible for patients with impaired glucose tolerance or uncomplicated type 2 diabetes with acceptable adherence rates.
Those studies with the best adherence have used an initial period of supervision, followed by relatively informal home physical activity programs with regular, frequent follow-up assessments.
A number of such programs have demonstrated sustained relative improvements in V o 2max over many years with little in the way of significant complications. In patients with type 2 diabetes, the insulin resistance syndrome continues to gain support as an important risk factor for premature coronary disease, particularly with concomitant hypertension, hyperinsulinemia, central obesity, and the overlap of metabolic abnormalities of hypertriglyceridemia, low HDL, altered LDL, and elevated FFA.
Most studies show that these patients have a low level of fitness compared with control patients, even when matched for levels of ambient activity, and that poor aerobic fitness is associated with many of the cardiovascular risk factors. Improvement in many of these risk factors has been linked to a decrease in plasma insulin levels, and it is likely that many of the beneficial effects of physical activity on cardiovascular risk are related to improvements in insulin sensitivity.
Regular physical activity has consistently been shown to be effective in reducing levels of triglyceride-rich VLDL. However, effects of regular physical activity on levels of LDL cholesterol have not been consistently documented.
With one major exception, most studies have failed to demonstrate a significant improvement in levels of HDL in patients with type 2 diabetes, perhaps because of the relatively modest exercise intensities used.
There is evidence linking insulin resistance to hypertension in patients. Effects of physical activity on reducing blood pressure levels have been demonstrated most consistently in hyperinsulinemic subjects.
Many patients with type 2 diabetes have impaired fibrinolytic activity associated with elevated levels of plasminogen activator inhibitor-1 PAI-1 , the major naturally occurring inhibitor of tissue plasminogen activator t-PA. Studies have demonstrated an association of aerobic fitness and fibrinolysis.
There is still no clear consensus on whether physical training results in improved fibrinolytic activity in these patients. Data have accumulated suggesting that physical activity may enhance weight loss and, in particular, weight maintenance when used along with an appropriate calorie-controlled meal plan.
There are few studies specifically dealing with this issue in type 2 diabetes, and much of the available data is complicated by the simultaneous use of unusual diets and other behavioral interventions.
Of particular interest are studies suggesting a disproportionate effect of physical activity on loss of intra-abdominal fat, the presence of which has been associated most closely with metabolic abnormalities.
Data on the use of resistance exercise in weight reduction are promising, but studies in patients with type 2 diabetes, in particular, are lacking.
A great deal of evidence has been accumulated supporting the hypothesis that physical activity, among other therapies, may be useful in preventing or delaying the onset of type 2 diabetes. There are now three published trials documenting that with lifestyle modification weight loss, regular moderate physical activity , diabetes can be delayed or prevented 7—9.
All levels of physical activity, including leisure activities, recreational sports, and competitive professional performance, can be performed by people with type 1 diabetes who do not have complications and are in good blood glucose control note previous section.
The ability to adjust the therapeutic regimen insulin and medical nutrition therapy to allow safe participation and high performance has recently been recognized as an important management strategy in these individuals.
In particular, the important role played by the patient in collecting self-monitored blood glucose data of the response to physical activity and then using these data to improve performance and enhance safety is now fully accepted.
Hypoglycemia, which can occur during, immediately after, or many hours after physical activity, can be avoided.
This requires that the patient has both an adequate knowledge of the metabolic and hormonal responses to physical activity and well-tuned self-management skills. The increasing use of intensive insulin therapy has provided patients with the flexibility to make appropriate insulin dose adjustments for various activities.
Such an approach not infrequently neutralizes the beneficial glycemic lowering effects of physical activity in patients with type 1 diabetes. General guidelines that may prove helpful in regulating the glycemic response to physical activity can be summarized as follows:.
Because diabetes is associated with an increased risk of macrovascular disease, the benefit of physical activity in improving known risk factors for atherosclerosis is to be highly valued. This is particularly true in that physical activity can improve the lipoprotein profile, reduce blood pressure, and improve cardiovascular fitness.
However, it must also be appreciated that several studies have failed to show an independent effect of physical activity training on improving glycemic control as measured by the A1C test in patients with type 1 diabetes.
Indeed, these studies have been valuable in changing the focus for physical activity in diabetes from glucose control to that of an important life behavior with multiple benefits.
The challenge is to develop strategies that allow individuals with type 1 diabetes to participate in activities that are consistent with their lifestyle and culture in a safe and enjoyable manner.
In general, the principles recommended for dealing with physical activity in adults with type 1 diabetes, free of complications, apply to children, with the caveat that children may be prone to greater variability in blood glucose levels.
In children, particular attention needs to be paid to balancing glycemic control with the normalcy of play, and for this the assistance of parents, teachers, and athletic coaches may be necessary. In the case of adolescents, hormonal changes can contribute to the difficulty in controlling blood glucose levels.
Despite these added problems, it is clear that with careful instructions in self-management and the treatment of hypoglycemia, physical activity can be a safe and rewarding experience for the great majority of children and adolescents with type 1 diabetes.
Evidence has accumulated suggesting that the progressive decrease in fitness and muscle mass and strength with aging is in part preventable by maintaining regular physical activity. The decrease in insulin sensitivity with aging is also partly due to a lack of physical activity.
Lower levels of physical activity are especially likely in the population at risk for type 2 diabetes. A number of recent studies of exercise training have included significant numbers of older patients.
These patients have done well with good training and metabolic responses, levels of adherence at least as good as the general population, and an acceptable incidence of complications. It is likely that maintaining better levels of fitness in this population will lead to less chronic vascular disease and an improved quality of life.
Checking every 30 minutes may be a challenge if you're doing outdoor activities or playing sports. But you need to take this safety measure until you know how your blood sugar responds to changes in your exercise habits.
Eat or drink something with about 15 grams of fast-acting carbohydrate to raise your blood sugar level, such as:. Check your blood sugar again 15 minutes later. If it's still too low, have another gram carbohydrate serving.
Then test again in 15 minutes. If you haven't finished your workout, you can continue once your blood sugar returns to a safe level. You may need to have more snacks or a meal to raise it to that safe range.
Check your blood sugar as soon as you finish exercising. Check it again throughout the next few hours. Exercise draws on reserve sugar stored in your muscles and liver. As your body rebuilds these stores, it takes sugar from your blood.
The tougher your workout, the longer it will affect your blood sugar. Low blood sugar can happen even 4 to 8 hours after exercise. Having a snack with slower-acting carbohydrates after your workout can help prevent a drop in your blood sugar.
These types of snacks include a granola bar, trail mix and dried fruit. If you do have low blood sugar after exercise, eat a small snack that has carbohydrates. For example, you could have fruit, crackers or glucose tablets. Exercise is great for your health in many ways. But if you have diabetes, testing your blood sugar before, after and sometimes during exercise may be just as important.
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Request Appointment. Diabetes and exercise: When to monitor your blood sugar. Products and services. Diabetes and exercise: When to monitor your blood sugar Exercise is a key part of any diabetes treatment plan.
By Mayo Clinic Staff. Thank you for subscribing! Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry. Show references American Diabetes Association.
Facilitating positive health behaviors and well-being to improve health outcomes: Standards of Medical Care in Diabetes — Diabetes Care.
Riddell MC. Exercise guidance in adults with diabetes mellitus. Accessed Aug. Diabetes diet, eating and physical activity. National Institute of Diabetes and Digestive and Kidney Diseases.
Physical Activity Guidelines for Americans. Department of Health and Human Services. Hypoglycemia Low blood glucose. American Diabetes Association. Colberg SR, et al. Palermi S, et al. The complex relationship between physical activity and diabetes: An overview.
Journal of Basic and Clinical Physiology and Pharmacology. Scott SN, et al. Clinical considerations and practical advice for people living with type 2 diabetes who undertake regular exercise or aim to exercise competitively.
Diabetes Spectrum. Zaharieva DP, et al. Practical aspects and exercise safety benefits of automated insulin delivery systems in type 1 diabetes.
Aerobic, muscle- and bone-strengthening: What counts for school-aged children and adolescents? Centers for Disease Control and Prevention. Accessed Sept. Products and Services The Mayo Clinic Diet Online A Book: The Essential Diabetes Book.
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Sheri R. Colberg Ecercise, Ronald J. SigalJane E. YardleyMichael C. RiddellDavid W. Contributor Disclosures. Exercise and diabetes read the Disclaimer at the Exericse Chocolate-covered sunflower seeds this page. TYPE 2 DIABETES Anv. Diabetes mellitus is a chronic condition, but people with diabetes can lead a full life while keeping their diabetes under control. Lifestyle modifications changes in day-to-day habits are an essential component of any diabetes management plan.
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