You may have to try a few times before you find the best way to reduce your insulin for activities. Keep careful records and discuss them at clinic visits. Blood sugar tests before and after exercise can help you make these decisions. It is OK to use Humalog insulin on one day and to use Regular insulin at the same time on another day. The choice of where you inject the insulin can help prevent low blood sugars.
Exercise increases blood flow into the part of the body that is moving.
The increased blood flow takes up more insulin. When a person with diabetes exercises, the blood insulin level may increase, whereas insulin levels decrease in non-diabetics during exercise. If you inject insulin into an arm or leg that you will use heavily during exercise, your body may absorb the insulin too rapidly. If you are going to run, don't inject insulin into the leg. If you are going to play tennis, avoid the tennis arm.