I rule I was taught was that your shutter speed should be twice (or close to it) the focus length of the lens. So, a 200 mm lens should be used at 1/400 shutter speed or greater. Of course, that can't always happen and was set before IS.
Indoors for sports such as basketball, 1/400 is barely enough to stop action.
http://www.diyphotography.net/shutter-speed


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