Back to Ask the Diabetes Team Ask the Diabetes Team

From Canada:

I am 42 years old and have been diabetic for 2 years. On NPH and Regular insulin in the morning and at supper. I go to the gym three mornings a week. I do not have anything to eat or drink before I go to the gym to exercise. My blood sugar is higher after an hour's exercise than if I just get up and go to work. Why?


I assume you are getting up the same time and taking your insulin at the same time on the days you go to the gym as on the days you do not go to the gym. If you are getting up at different times or taking your insulin at different times, this may partly explain the difference. It is also possible that your are "rebounding" on days that you wake up with a low blood sugar (after a low blood sugar, the body can overreact by pulling stored sugar from the liver which will raise the blood sugar).

Usually, exercise will lower the blood sugar. If ketones are present, or there is not enough insulin available, the opposite may occur. You are taking a somewhat unusually high proportion of insulin in the morning compared to the evening dose. It is quite possible that your morning NPH is working well into the night and early morning and wearing off by 5:30 AM. You may want to discuss with your physician rearranging your insulin to take less in the AM and more in the PM to have more insulin working in the early morning hours. You should not make any changes without discussing them with your own physician.


Original posting 25 Jan 97


  Home Return to Top

Last Updated: Tuesday April 06, 2010 15:08:52
This Internet site provides information of a general nature and is designed for educational purposes only. If you have any concerns about your own health or the health of your child, you should always consult with a physician or other health care professional.

This site is published by T-1 Today, Inc. (d/b/a Children with Diabetes), a 501c3 not-for-profit organization, which is responsible for its contents.
By using this site, you agree to our Terms of Use, Legal Notice, and Privacy Policy.
© Children with Diabetes, Inc. 1995-2015. Comments and Feedback.