…safe pre-exercise blood sugar range.
• 250 mg/dL (13.9 mmol/L) or higher. This is a caution zone. Before exercising, test your urine for ketones — substances made when your body breaks down fat for energy. Excess ketones indicate that your body doesn’t have enough insulin to control your blood sugar. If you exercise when you have a high level of ketones, you risk ketoacidosis — a serious complication of diabetes that needs immediate treatment. Instead, wait to exercise until your test kit indicates a low level of ketones in your urine.
• 300 mg/dL (16.7 mmol/L) or higher. Your blood sugar may be too high to exercise safely, putting you at risk of ketoacidosis. Postpone your workout until your blood sugar drops to a safe pre-exercise range.
Stop exercising if:
• Your blood sugar is 70 mg/dL (3.9 mmol/L) or lower
• You feel shaky, nervous or confused
After you exercise: Check your blood sugar again
Check your blood sugar right away after exercise and again several times during 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 more strenuous your workout, the longer your blood sugar will be affected. Low blood sugar is possible even hours after exercise.
Foods that help raise blood sugar…
If you do have low blood sugar after exercise, eat a small carbohydrate-containing snack, such as fruit or crackers, or drink a small glass of fruit juice. Additional healthy choices include:
• Two to five glucose tablets
• 1/2 cup (118 milliliters) of fruit juice
• 1/2 cup (118 milliliters) of regular (not diet) soda
• Five or six pieces of hard candy
Recheck your blood sugar 15 minutes later. If it’s still too low, have another serving and test again 15 minutes later. Repeat as needed until your blood sugar reaches at least 70 mg/dL (3.9 mmol/L). If you haven’t finished your workout, continue once your blood sugar returns to a safe range.
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Exercise can be beneficial to your health in many ways, but if you have diabetes, testing your blood sugar before, during and after exercise may be just as important as the exercise itself.