Spontaneously and precisely adjust insulin levels.
In general, during increased physical activity, blood glucose levels drop and you need less insulin. This is because your body is working harder and uses up glucose for the extra fuel the muscles need.
Insulin during exercise.
In people without diabetes, the body automatically reduces the level of insulin during exercise. People with diabetes need to either adjust their insulin or eat extra food to compensate. Insulin pumpers have the luxury of being able to spontaneously and precisely adjust insulin levels.
Exercising and getting started on a pump.
When you first start on the pump, your healthcare professional and/or diabetes educator may ask you to refrain from doing exercise for a little while. This may be helpful as everyone (including you!) is working to get your basal rates on target. If you have a very consistent exercise routine, this becomes less of an issue. Check with your healthcare professional and/or diabetes educator for his or her specific recommendation.