If you shoot RAW, then you could double your shutter speed which would result in being a stop underexposed, then brighten the resulting image a stop in software. This would give you the equivalent of ISO 3200, but it only works in RAW.
You really only have 2 choices...get a faster shutter speed via either a faster lens or higher ISO, or use flash as your main light. This will allow the flash to freeze the action (getting rid of the blur), and allow you to use a lower ISO for cleaner images, i.e. less noise. If you go the flash route, I would recommend using a flash bracket that lets you get the flash a long way away from your camera to reduce red eye as much as possible.
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Steve
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