This morning at 7 a.m., before eating anything, I took my numbers and they were 110. I then exercised for about 45 minutes. At 8:45 I took my numbers again. I still had not eaten anything. Now, they were 121. How could his happen? I have type 2 diabetes. My A1C is 6.
The effect of exercise on blood glucose levels in people with diabetes can be difficult to predict. Physical exertion is a stress and stress can raise blood glucose levels. The increase in metabolism in exercising muscles demands a supply of energy. This need for energy is met by increased entry of glucose into muscle cells, which can cause hypoglycemia. After exercise, insulin sensitivity is increased, which can also lead to hypoglycemia. The good news for you is that your blood glucose level was essentially unchanged with exercise. Current standards dictate that blood glucose meters have a margin of error of 20%. Your readings of 110 mg/dL and 121 mg/dL +/- 20% are not significantly different. It is expected that the standards will be revised in the near future to decrease the margin of error to 10%.