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1 Insulin sensitivity is increased, so your cells are better able to use any available insulin to take up glucose during and after activity. 2  When your muscles contract during activity, it stimulates another mechanism that is completely separate of insulin.
The action of insulin measures how soon after injecting insulin will start to work. The duration of insulin is how long after injecting the dose of insulin will remain working for. Insulin actions are quite an important concept, particularly for insulin dependent diabetics. In an ideal treatment, the speed at which your insulin starts to work would perfectly match the rate at which your blood sugar raises after each different meal.