Cycling doping and Insulin?

Among other drugs I have heard that part of the Fuentes doping regiment included insulin.
I have tried to fugure out how this would be useful and how it is done - not that I want to do it.
I have found that some body builders are using it but they don't really say what it does in medical terms and I cannot find info for how endurance athletes might benefit.
Anyone know?
Answer:
hmm, for endurance it might help understand.
Insulin is released from the pancreas after a meal due to an increase in blood glucose level.
It stimulates the muscle and liver cells to uptake and use glucose as a primary energy source.
Insulin promotes glycogen synthesis, converting the excess glucose into glycogen as a form of energy storage in the muscles.
Hence during intensive long term exercise, this energy storage can be hydrolysed easily and the energy required can be easily supplied to the cells that needs them.
Check up more under Actions on cellular and metabolic level of wikipedia if you want

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not sure but i think insulin has a lot of sugars init

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Insulin helps our bodies utilize glucose to its full potential. Glucose is the most efficient form of energy our body has. So body builders use insulin so their muscles "absorb" the glucose in the blood stream, thereby increasing their energy in the weight room or wherever.

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I am not totally sure about my answer, but insulin is a sugar and the only reason i could see it being used, despite to regulate low blood sugar levels, is to increase the athelete's energy levels before a long run. Like eating a Snicker's Bar before a major exam, a jolt of sugar gives you a quick burst of energy.
Technically the body breaks down Insulin into glucose and then it gets metabolized and used as a quick energy source by the bodies muscles. Glucose is one of the bodies main fuel sources. If you're really interested, ask a Biochemistry major about the Kreb's cycle and how the body uses glucose for fuel.

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That is unbelieveably stupid and dangerous. Yes, it could promote glucose uptake in the muscle tissue. However, it could also induce hypoglycemia and death. But I suppose winning is more important than life and health to some people.

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