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Message: <blockquote data-quote="Deleted member 527103" data-source="post: 2689439">Fast acting insulin lasts for about 4 hours. Long acting insulin used for basal lasts between 12 and 36 hours depending upon the insulin.Then there is mixed insulin but I don't have much experience/knowledge about that. (Sorry to be pedantic but it could be confusing if you think all insulin lasts for 4 hours if you take basal once or twine a day.)I agree except it depends upon your fitness. An hour of walking would have little impact for me unless I was walking fast or up a steep hill. I would also add exercise can push BG up as well as down during the exercise. For example, my brisk hour walk would cause a drop whereas a step uphill for an hour, especially if it was windy or raining, would cause my BG to rise. However, both could result in a lower BG for up to 48 hours. So, [USER=586935]@Jingaling[/USER] make sure you have your hypo treatment with you throughout the night as well as when exercising.</blockquote>

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