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Diabetes Care, Vol 11, Issue 2 201-211, Copyright © 1988 by American Diabetes Association
Role and management of exercise in diabetes mellitus
ES Horton
Department of Medicine, University of Vermont College of Medicine, Burlington 05405.
As more is understood about the physiology of exercise, in both normal and
diabetic subjects, its role in the treatment of diabetes is becoming better
defined. Whereas people with diabetes may derive many benefits from regular
physical exercise, there are also several hazards that make exercise
difficult to manage. In type I (insulin-dependent) diabetes, there are
risks of hypoglycemia during or after exercise or of worsening metabolic
control if insulin deficiency is present. Type II (non-insulin-dependent)
diabetic patients treated with sulfonylureas are also at some increased
risk of developing hypoglycemia during or after exercise, although this
poses less of a problem than with insulin treatment. In individuals treated
by diet alone, regulation of blood glucose during exercise is usually not a
significant problem and exercise can be used as an adjunct to diet to
achieve weight loss and improved insulin sensitivity. When obese type II
diabetic patients are treated with very low calorie diets, adequate amounts
of carbohydrate must be provided to ensure maintenance of normal muscle
glycogen content, particularly if individuals wish to participate in
high-intensity exercise that places a heavy workload on specific muscle
groups. On the other hand, moderate-intensity exercise such as vigorous
walking can be tolerated by individuals on very low calorie,
carbohydrate-restricted diets after an appropriate period of adaptation. A
number of strategies can be employed to avoid hypoglycemia in type I
diabetic patients, and both type I and II diabetic patients should be
examined carefully for long-term complications of their disease, which may
be made worse by exercise. These considerations have led many
diabetologists to consider exercise beneficial in the management of
diabetes for some individuals but not recommended for everyone as a
necessary part of diabetes treatment as in the past. The goals should be to
teach patients to incorporate exercise into their daily lives if they wish
and to develop strategies to avoid the complications of exercise. The
rationale for the use of exercise as part of the treatment program in type
II diabetes is much more clear than for type I diabetes; regular exercise
may be prescribed as an adjunct to caloric restriction for weight reduction
and as a means to improve insulin sensitivity in the obese
insulin-resistant individual.

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Copyright © 1988 by the American Diabetes Association.
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