Exercise and Diabetes Mellitus: A Vital Guide
Today, a significant number of people suffer from Diabetes Mellitus—a metabolic disease characterized by elevated blood glucose levels due to relative, partial, or total insulin deficiency. According to the World Health Organization, approximately 171 million people worldwide live with the disease, a number expected to double by 2030.
The Three Main Types of Diabetes
- Type 1 Diabetes (T1D): No insulin is produced (chronic).
- Type 2 Diabetes (T2D): The body does not produce enough insulin to meet metabolic needs (chronic).
- Gestational Diabetes: Usually temporary; appears during pregnancy and typically resolves after childbirth.
Symptoms and Complications
Diabetes is often called a “silent” disease because it frequently presents no symptoms. When they do occur, symptoms include polyuria (excessive urination), polydipsia (excessive thirst), constant hunger, nausea, weight loss, and polyphagia. Complications are related to vascular issues that can lead to damage in vital organs.
Management: The Role of Exercise
Managing Type 1 and Type 2 Diabetes is a lifelong process involving insulin (injections) or oral medication. Alongside medical treatment, a proper diet and exercise are absolutely essential and irreplaceable! There is no single “perfect” program; the best exercise is one that fits the patient’s needs, lifestyle, and interests.
General Exercise Guidelines
Medical clearance is mandatory. Your doctor must inform you about the appropriate type and intensity of exercise, as certain activities may be harmful depending on complications (e.g., individuals with retinopathy or heart disease must avoid excessive strain).
- Aerobic Exercise: 20-40 minutes is recommended. This includes a 5-10 minute warm-up, 20-30 minutes of main exercise, and a 5-minute cool-down.
- Strength Training: High-strain activities like heavy weightlifting are generally discouraged. Instead, low-intensity resistance training in a circuit format is recommended to engage multiple muscle groups safely.
- Sports: Patients can participate in individual or team sports (football, basketball, swimming, dancing, tennis, etc.), provided they are performed at a non-violent, moderate intensity.
- Frequency: Daily exercise is ideal, with a minimum of 3-4 times per week.
Important Safety Rules
- Timing & Nutrition: Consult your doctor regarding the best time to exercise. Since exercise lowers blood sugar, consume a small amount of easily absorbed carbohydrates before your session.
- Insulin Management: If exercise is planned, insulin dosage may need adjustment. Avoid injecting into muscle groups that will be active during training.
- Hypoglycemia: Always have glucose or sugar readily available in case of a “crash.”
Thresholds for Safety: Do NOT exercise if blood sugar levels are:
- Over 300 mg/dl (Type 1)
- Over 400 mg/dl (Type 2)
- Over 240 mg/dl (for children with Type 1)
- Illness: Avoid exercise when sick; wait until your sugar levels return to normal.
Conclusion
Exercise should be a daily habit for those with diabetes. It contributes significantly to blood sugar regulation, reduces cardiovascular risk, and helps with weight control. Beyond the physical benefits, it boosts confidence, reduces stress, and improves the overall quality and duration of life.
Written by Dimitris Krinakis, Physical Education Professor (AUTh)